Tag Archives: PCB Design

Why printed circuit board manufacturers use plated slots ?

one stop pcb assembly, PC Board, pc board assembly, pcb assembly, pcb assembly contract manufacturer, pcb assembly near me, pcb assembly services, pcb assembly usa, pcb board assembly, PCB Design, printed circuit assembly, Printed Circuit Board, printed circuit board assembly, , , ,

Printed Circuit Board Plated Slots

Slots are holes, which are either plated or non- plated-through. So, plated slots are holes plated in copper. And we use them for electrical connections on the PCB. A through slot is the one that goes to the entire depth of the board, starting from one end to another. Whereas a PCB outline or edge also has plating called side plating.

printed circuit board manufacturers use plated slots for components packaging, however, non-plated slots are also in practice. But, PCB with multiple layers have only plated-through slots.

Why Prefer Plated Slots?

PCB assembly involves different designs and components, and you would often see round holes to accommodate the round components or square as well. A round hole suits a PCB with through-holes. However, certain components are compatible with the blade or rectangular leads, so the round or square holes are not ideal in that case, and this is where a plated slot works.

When the pin size becomes large, the rectangular connectors work with plated-through slots rather than round holes. Like, they are ideal for the DC Jacks. Though you can use the round holes for small connectors and rectangular pins, plated slots are better because they take less space on the PCB, unlike the round holes.

Difference between Plated And Non-Plated Slots

Plated slots have copper plating in the circuit layer, whereas it opens in the solder mask.
On the other hand, non-plated slots don’t have copper plating in the circuit layer, besides, it does not open in the solder mask.

Design of Plated Slots

There is a specific way to show plated holes on the Gerber, like:

    • You have to put the copper pads on the upper and lower solder mask.
    • Then you insert a milling slot in the mechanical layer.

Designers prefer a mechanical layer to put slots in the Gerber and it involves two possible options to do it.;

Use of Flashes Having the Right Size Slot

Drawing a slot with a 0.50 mm thick line, as it helps designers to check it visually to ensure that there is enough tolerance between copper and the PCB edge. Remember that a line’s center is considered the edge of the slot.

Then you have to join the slots with the PCB outline into the Gerber, and it should be parallel to the copper layer. However, the copper layer should also have a PC Board outline to stay on the safer side.
The mechanical layer in this case has different names, depending on the system. It also depends on milling as it should be there. However, you can use another layer in the absence of a mechanical layer. Use the README file to avoid any doubts regarding the right file.

Don’t always define slots in a legend or a copper layer because they could be misinterpreted. Show large slots in the legend or copper layer, however, the outline should be precise. Don’t forget to write the text SLOT in the center.

Creating a Drill File

You can also define the plated slots through drill files as it is a precise way, however not all CAD software allows this option. But, defining through the drill files involves the X and Y or the slot width and length, instead of a complete row of holes that overlap.

Understanding A Small Slot In The PCB

The size of the smallest slot varies, depending on the type of the PCB, like if it’s flex, rigid, or rigid-flex. The width of the smallest slot is 0.50 mm for a rigid and flex-rigid PCB, and the length is often 1.0 mm.

These sizes are so due to more thickness of the PCB, besides, the slots are created through the NC milling that is mechanical. As, the grooving cutter of NC is 0.50 mm and its length is twice the width, like 1.0 mm.

On the other hand, the thickness of the flex PCB is less, and you can make slots through a laser machine. Designers prefer the smallest slot because the bigger slot’s length becomes more which is twice its width.

Milling Of the Cutouts Or Slots

You have to use the round NC grooving bit for the milling of slots in the rigid PCB, and it’s just like the CNC machine. However, the inner corners of the slots are made round instead of sharp. Whereas the PCB edge is created to the center of the border.

Which Industries Can Use the Plated Slots?

Mostly the thick or multilayer PCBs have plated slots, and such boards are ideal for different industries, including aerospace, consumer electronics, computer, and telecommunications. As these slots don’t take much space, they are cost-effective in terms of making. A board with both plated slots and round slots is also ideal for multiple electrical connections.

Frequently Asked Questions

What Is A PCB?

PCB stands for a printed circuit board having different electrical components, holes, and other features. Various industries use PCB boards to provide the electrical signals to run different devices or electronics. A PCB board can be embedded, single or double-layered, or can have many layers like up to 60 plus.

What Is The Definition Of A Plated Slot?

A plated slot is a hole in the PCB with copper plating. It is not round, so it is ideal to accommodate the leads with rectangular pins. You can use such a slot for electrical connections and component packaging
The slot goes throughout the circuit board that’s why we call it a plated-through slot.

What Is Edge Plating?

If plating is done on the edges of a PCB, we call it edge plating. Besides, you can also call it the side plating of a circuit board. It goes from the upper layer to the lower layer of the PCB, extending to an edge of the perimeter.

Which Circuit Board Should Have Plated Slots?

Generally, the multilayered PCBs have slots with plating also known as plated-through slots. However, there are also non-plated slots, depending on the PCB design and its application.

Do I Need A Lot Of Space For Plated-Through Slots?

Plated slots are mostly rectangular, hence they don’t take much space on the PCB like the round slots. So, such slots are ideal when you run short of space on the PCB, and where you need to use the rectangular Jacks.

What is a Copper Layer?

PCB has different layers of which one is a lamination made of copper foil, and it is attached to the circuit board with some adhesive. The copper layer is essential for a two-sided PCB, including copper on both sides. But, PCB boards with more than 60 layers of copper are available by different companies.

What is Solder Mask Layer?

The green color on the circuit board is a solder mask and its surface is called the solder mask layer. The purpose of the solder mask is to cover the exposed copper to prevent users from the electric shock upon contact. Though it is mostly green, other colors are also available.

Final Thoughts

PCB manufacturers use plate slots for components packaging, however, the non-plated slots are also in practice. But, PCB with multiple layers has only the plated-through slots. Certain components are compatible with the blade or rectangular leads, so the round or square holes are not ideal in that case. This is where a plated slot works.

Plated slots have copper plating in the circuit layer, whereas it opens in the solder mask. Non-plated slots don’t have copper plating in the circuit layer, besides it does not open in the solder mask.

The size of the smallest slot varies, depending on the type of PCB, like if it’s flex, rigid, or rigid-flex. The width of the smallest slot is 0.50mm for rigid and rigid-flex PCB and the length is often 1.0 mm. Engineers use cad software to make Gerber files for different types of slots including plated through and non-plated through slots.

Would like to know best practices for Plates Slots or printed circuit board assembly? Email us at sales@pnconline.com

What is Back Drilling in PC Board Manufacturing

What is Back Drilling in PC Board Manufacturing?

Circuit board fabrication, PC Board, pc board assembly, PC Board fabrication, pcb assembly, PCB Design, PCB Fabrication, printed circuit assembly, Printed Circuit Board, , , ,

Back Drilling is a way to remove the copper barrel’s stub from the through-hole. A stub is an unused part of the plated-through holes as it does not perform any function on the circuit, so it’s not needed.

For example, while producing a 12-layer PCB you have to make a hole to connect the first to 10th layers. In general, via holes are drilled and then copper plating happens which connects the first layer to the 12 layers, whereas you only have to connect the first layer to the tenth layer.

The part from the 11 to 12 layer is useless as there is no electrical connection, so it is only a pillar. This extra length of via affects the signal passage, making the communication weak. So, that extra pillar or stub has to be removed from the back through another drilling.

Moreover, back drilling is also known as CDD, controlled depth drilling and you can use it in any Printed Circuit Board having weak signals.

Why Do You Need To Remove the Stub

The stub is not just a waste, but it affects high-speed signals by distorting them. When these signals pass through a copper barrel having a long stub, it results in a high distortion. Thick or multi-layered PCBs and back panels are more vulnerable to weak signals due to stubs.

Printed circuit boards of high-frequency should have blind and buried vias, as well as back drilling. Besides, you don’t have to consider the layout design in the back drilling. On the other hand, you have to consider the aspect ratio in blind vias.

When the Circuit board fabrication is over, the fabricators redrill the holes to remove the stubs. This process involves a large drill compared to other holes. In other words, you have to back drill the holes to a controlled or limited depth, like it should not reach the last layer including via.

However, the back drilling is not a clean process like other drilling methods, as the copper gets electrolyzed in this case. Besides, the drill point is sharp in this case, so the fabricator leaves a small point. Moreover, the b-value or the remaining stub length should be from 50 um to 150 um.

What Are The Benefits Of Back Drilling Or CDD?

Back drilling has many benefits as described below;
• It involves fewer bit errors
• It reduces the deterministic jitter
• It provides more data rates
• You get more channel bandwidth through back drilling
• The enhanced independence matching helps reduce the signal attenuation
• It helps reduce the resonance mode’s excitation or noise
• It does not involve the consideration of any aspect ratio
• It reduces a stub’s EMI radiation
• Back drilling reduces the thickness of local plates
• It enhances the signals, making them powerful
• It eliminates the need for blind holes
• It enhances a PCB’s production process

Back Drilling Principles

During the drill bit drilling, the tip of the drill connects with the substrate board’s copper layer. This process produces a low-level current to evaluate the PCB’s surface height, drilling with an appropriate depth. So, drilling stops after the set depth.

Applications of Back Drilling

You can use the PCBs with back drilling for different industries, including aerospace, computers with large servers, medical equipment, communication, and military.
In the case of military or aerospace, only the manufacturers having a background with these industries are eligible to provide the back drilling in PCBs. This means the ordinary PC Board companies can’t get such projects.

How to Proceed With Back Drilling

The back drilling or CDD process involves a few steps, such as:
• It involves the PCB with tooling holes through drilling
• Copper plating of holes before sealing of the dry film
• Developing graphics on the external surface when the plating process is over
• After graphics, making plating with patterns and providing the sealing of the dry film of positioning holes. However, the sealing is done before the pattern process.
• The tooling hole’s s drilling and vias’ back drill
• Cleaning of vias from the residual that occurs during a back drilling of holes.
• The back drilling of the left via is done from the top surface, whereas the back drilling of the right via occurs from both sides.

PCB Features for Back Drill

The PCB with back drilling consists of certain features, such as:
• Only a rigid PCB can go through back drilling
• PCBs with 8 to 50 layers can have a back drill
• Its thickness is 2.5 mm or more than that
• The aspect ratio of the PCB is also large
• There is less trace in the external surface, like in a square array with press-fit holes.
• PCB dimensions are larger than the boards without back drilling
• The depth clearance for a back drill has to be +/- 0.05mm
• The thickness of the insulation should be at least 0.17mm
• Generally, the back drill hole is larger than other vias, like more than 0.2 mm
So, the PCB drilling involves various stages and back drilling is the second stage that removes the unused plating of vias. It involves a specific depth and the side of copper.
The secondary drilling has to be precise, and that depends on the expansion and contraction of the board, drilling technique, tool accuracy, and certain other factors.

Precautions to Follow While PCB Drilling

Whether it’s back drilling or some other, you need high-quality tools to bring the best results.
• Drills often wear while making holes in the thick boards, especially, small drills and they can affect the surface finishing, as well as the size of the hole. It also increases the drilling force, so your tool must have no wear.
• A worn-out drill needs more force to operate, besides, its temperature also increases, and eventually, the chemical and physical reaction of the drill wear also increases, causing a poor drill.
• You can reduce the drill wear by keeping the aspect ratios low, however, this is not in the case of back drilling.
• Also, take care of the chip load that depends on the drill diameter. Often drills with a small diameter break faster than the drill have a large diameter.
• You should hire professional services for your PCB design, execution, and assembly.

A Technique to Calculate the Drill Diameter

You can do it through the below formula,
Size of the back drill = size of the via or pad hole + 2 x design rule of an oversize back drill

Frequently Asked Questions

What Is The Main Purpose Of Back Drilling?

The basic function of the PCB back drilling is to remove a part of the through-hole that does not transmit the current. If you don’t remove a long hole, it will affect the high-frequency signal transition, causing reflection or distortion.

What Is A Stub In PCB Fabrication?

The stub is an unused part of plated-through holes, as it does not perform any function on the circuit, so it’s a waste. It will affect the signals if you don’t remove the stub.

What Are Plated-Through Holes?

The PTH or plated-through holes connect multiple layers of copper in a PCB to provide an electrical connection to the components.

What Is CDD In PCB?

CDD stands for controlled drilling depth or back drilling that removes stubs or wasted copper parts from the PCB holes.

What Are Other Factors Affecting The Integrity Of The Signals?

Not only stubs, but some other factors also affect the transmission of the electric signals in PCB components. Like, PCB material, connector type, chip package, vias, transmission lines, etc.

Why PCB Should Have Drilling?

The printed circuit boards have become more advanced and their demand has also increased that needs high quality. PCB involves through-hole drilling to create a transition path for the electric signals in various circuits.

Final Thoughts on Back Drilling In PCB

PCB drilling process has different stages and back drilling is the second stage that removes the unused copper plating. It involves a specific depth and the side of copper. It has to be precise, and that depends on the expansion and contraction of the board, drilling technique, tool accuracy, and certain other factors. Printed circuit boards of a high-frequency should have blind and buried vias, as well as back drilling.

The stud or extra length of via affects the signal passage, making the communication weak. So, that stub has to be removed from the back through another drilling. The back drilling is not a clean process like other drilling methods, as the copper gets electrolyzed in this case.

PCBs with back drilling is used in different industries, including communication, computers, military, aerospace, etc. you may have to go through some challenges while back drilling, but by following some precautions you can overcome them.

Interested to know more about Back Drilling or Printed Circuit Board assembly? Just email us at sales@pnconline.com

Castellated Circuit board fabrication (Uses, and Design Guide)

Castellated Circuit board fabrication (Uses, and Design Guide)

pc board assembly, PC Board fabrication, pcb assembly, PCB Design, PCB Fabrication, SMT assembly, Uncategorized, , , ,

Electronic goods are increasing with a time that demands smart, high density, and multifunctional PCBs. You will see smarter PCBs than in the past as their geometric index is continuously increasing. Advanced PCBs with reduced sizes need to have updated soldering with a better electrical connection. Large holes result in poor connections, affecting a product, hence, the hole size has reduced to half.

PCB’s need different holes for connections and one of them is plated half hole and designers also call it a castellated hole. It is a drilled hole finished in copper and it exists on the board boundaries.

As holes are semi-plated, so we call them plated half holes. These holes help mount one PCB to another and simplify the assembly of PCBs. The hole looks like a broken circle and enhances the PCB’s soldering. In other words, plated half holes help in board-to-board soldering.

You can enhance various Printed Circuit Board modules through castellation, including Bluetooth or a Wi-Fi module. You can install these modules together during soldering. The castellated holes can directly connect two circuit boards, creating connections between the board and its module.

You can apply these holes in different displays, high frequency, as well as ceramic modules that need soldering to a standard board. Remember that this technology is not compatible with single-layered PCBs.

The boards with semi-plated holes can benefit different industries, including power, computers, consumer electronics, automobiles, and telecommunications.

PCB fabrication of PCB Castellations

PCB has to go through a certain process for plated half holes, and it involves a certain order. So, let’s look at all the manufacturing steps.

• Holes drilling process
• Castellated hole making
• Making of panel plating
• Image transfer
• Pattern plating process
• Stripping is done
• Etching process
• Solder masking process
• Surface finishing
• Implementation of castellated holes

Stacking Of PCBs through Plated Half Holes

The use of plated half holes for stacking of two PCBs involves two criteria, such as

• First, the circuit boards must have an electrical contact, as just a physical connection won’t work. So, both PCBs should have electrical connections.
• The boards should be tightly placed without any space between them. Even a little space between the boards will result in incomplete or wrong soldering.
The semi-plated holes technology is cost-effective and effectively changes a PCB into a surface-mounted assembly. As PCBs are plated and concave, so they offer an excellent soldering base. Mounting of one PCB over another involves a zero distance between them, so plated had holes are best because they lie on the board edges. Besides, dust won’t stay between two PCBs, providing flawless connections.

Uses of Plated Half Holes in PCB

Half holes or castellated holes are located on the circuit board’s edges and resemble several PCB parts. There are different ways to use these holes, such as:
• PCB with plated half holes serves as a breakout board for bigger circuit boards.
• These holes help you to have a custom design of the component like you can alter the pin layout according to your needs.
• Castellated holes help manufacturers to install one PCB to another without any hassle.
• These holes join two circuit boards without leaving any void between them, helping in precise soldering.
• Plated half holes help you to develop a single PCB based on integrated modules. The board is ready for another assembly through its modules.
• The Wi-Fi modules and breakout PCBs also depend on semi-plated holes. Moreover, these holes help you to develop wireless connections between PCBs.
• These holes also help engineers to use complex components with a breadboard which is often a great challenge.

• Castellated holes allow you to reuse the IC without any fear of the damage that happens in direct usage.
• The holes help to work easily with leadless components, such as LGA, QFN, BGA, etc. during SMT assembly
• Small PCB with castellated holes act as subcircuits for large boards containing inverters or filters etc. They are compatible with multiple modules, including GOS, GPRS, GMS, and several other smart modules.

Guidelines for Making Plated Half Holes

You have to consider some design parameters for PCB soldering with castellated holes. There are some guidelines to follow in this case, including diameter, distance, size padding, surface finishing, etc. You can successfully use these holes by following the below parameters.

Holes Diameter
PCB is either advanced or standard and castellated holes are compatible with both. In the case of a standard PCB, the diameter of a hole should be at least 0.6 mm. whereas, you can keep it lower than 0.6 mm in advanced PCBs.

Holes Distance
On the other hand, the distance between two half-plated holes should be at least 0.55 mm. Make sure it is not less than this figure, as it would hinder the soldering.

Surface Size
The surface for making castellated holes for a PCB mount should be large enough. Small size won’t let you keep enough distance between the holes.

Surface Finishing
You must well prepare a surface for PCB mounting like you can do it through an ENIG finish as it is more practical. But, the purpose of PCB also helps to determine the right finishing material.

Suitable Pads
You must use heavy pads as they help join two castellated PCBs without any flaw. There should be a minimum number of holes while using them for soldering, as it can enhance PCB assembly and alignment. Whereas the circuit board’s design also determines the number of holes it should have. But, you can reduce or increase this quantity according to your requirements.

After following the above guidelines, the mounting and assembly of boards would be simple and flawless.

The Design of Plated Half Holes

In terms of design, castellated holes are developed in different styles, such as
• Half holes
• Half holes with small cuts
• Holes with small leads for connectors
The design process involves drilling and copper plating, but via is not like normal PCBs, instead, it is smaller than a standard hole. The micro vias diameter is less than 150 microns, and you can make them using laser technology or a mechanical technique. The laser technology is more convenient in developing a PCB and a small via ensures more output.
You can select any process that suits your PCB, and once the holes are ready, they are cut into half, resembling a semi-circle that’s why we call it a half hole. The holes opening is always on the PCBs edges.

Indicating Plated Half Holes In PCB Design

Different software brings different designs for holes, however, the Gerber files include specific results. You can add a hole directly on the edge of the board, then can cut it across. So, make sure the half portion of the hole is on the PCB, and half is on another side of the outline.
It should include;
• The GTL copper layer and a GBL copper layer, which are copper pads for both upper and lower layers for every half hole.
• Solder mask layers, including the GBS and GTS, and openings for a solder mask on both sides.
• Each plated hole requires drilling that involves a drill layer, including DRL and TXT.
• Likewise, the mechanical layer should cut the drill hole. This layer includes the GKO and GML.
But, you should consider what your design software offers in terms of documentation.

Cost of Plated Half Holes
The manufacturing of plated half holes involves more work and time, and you need to do every step with care. So, a PCB with these holes becomes expensive than standard boards. However, the cost also depends on the design, your requirements, and a circuit board’s size.

Certification
Plated half holes should be certified, depending on the country of manufacturing. Like, it should be RoHS-certified in the United States. A certified board ensures a high-quality product that you can trust in terms of application.

Frequently asked questions

What Is The Difference Between Plated And Non-Plated Holes In PCB?

Plated holes are finished or plated in copper, whereas non-plated holes are without copper finishing.

Why Do PCB Vias Require Plating?

PCB connects different layers on the PCB, providing a path for electrical signals. Your product won’t work without connectors, so vias are essential.

Can You Use Plated Half Holes For A Single-Sided PCB?

No, a single-sided PCB has a single layer, whereas half holes are suitable for more than one layer as they help join two PCBs.

Can The Number Of Drills Affect The PCB Cost?

Fabrication of PCB requires holes through drilling, and more holes mean more drilling. If the number of drills is more, it requires more time to complete, hence, it will increase the manufacturing cost. So, the total cost of PCB will also increase. However, you will have to consider this factor for bigger PCBs as small boards are cost-effective.

Final Thoughts

PCB needs different holes for connections and one of them is plated half hole and designers also call it a castellated hole. It is a drilled hole plated or finished in copper and that exists on the board boundaries.

The boards with semi-plated holes can benefit different industries, including power, computers, consumer electronics, automobiles, and telecommunications.

Interested to know more about Circuit board fabrication of castellated holes. Email us at sales@pnconline.com

Blind and Buried Vias in PCB Board Technology

Blind and Buried Vias in PC Board Technology

PC Board, pc board assembly, pcb assembly, PCB Design, Printed Circuit Board, , ,

PCBs are used to enhance a circuit’s function and stability. There are different vias in a PCB, PC Board, including the blind and buried via. We need to connect different layers in the PCB through a specific via, depending on its design. In general, vias are holes finished in copper, and their position depends on if the PCB is double-sided, or multi-layered.

Here, we will explore the blind and buried via, their benefits, construction, and guidelines to implement them. Before we go into details, you must know the meaning of via, and its role in the PCB.

Understanding Vias

A copper-finished hole in the PCB is known as via, and it joins both layers of a two-sided PCB. The standard via is a hole that starts from one layer and goes up to the second layer in a double-layer board, and it is also known as a through-hole via. A through via is not ideal for a high-density PCB because it takes more space, affecting the board thickness or density.

So, PCB designers prefer a blind or buried via for the multi-layered or HDI boards.

What Is A Blind Via

In blind via, the hole connects the outer layer of the PCB to its inner layer. The outer layer, in this case, can be either top or the bottom layer. It is applied to the HDI or high-density interconnection boards. Blind via enhances the PCB density through the closed placement of its components.

What Is A Buried Via?

The buried via is a hole that connects two inner layers of a PCB board. The name buried is because the hole is buried in between both upper and lower layers. Besides, you can drill it in many layers of a multi-density PCB. A buried via is also used in the HDI PCBs. There are also other types of PCB vias that we will discuss in the end.

Manufacturing Of Via

There are two ways to make a PCB via like the hole is drilled either before adding various layers to the circuit board, or after making all layers. The manufacturer drills all vias and then finishes them in copper.

• You must take care of the drill depth while making the buried and blind vias, because an extra deep hole can distort signals, reducing their speed.
• On the other hand, a very shallow hole can break a connection, affecting the PCB performance. Even, the PCB can stop working due to poor drilling, so give it to expert hands.
• The manufacturer should also know all the dos and don’ts of pcb assembly. So, always hire a good designer and manufacturer for your custom PCB.

How To Fill Or Cover Vias

Via cover must prevent the entrapment of chemicals or other substances within the holes, which can eventually cause defects to the printed circuit board. Vias are filled with conductive or non-conductive paste. Blind vias and via-in-pads are filled with well-designed electroplating.
If you are looking to move heat from one side of the printed circuit board to the other, you will likely opt for a conductive fill.
Vias must be sealed or covered by copper plating. The combination of the sequential build-up of technology and the mechanical processes can disturb the buried via plating, resulting in problems with the board. To prevent this problem, the vias are filled with resin before being plated.
A via-in-pad must be plated because you are putting in a component connection, and you can’t have a recessed hole.
Now, we will discuss the advantages and disadvantages of blind and buried vias.

Advantages That You Get From Blind And Buried Vias

1. The blind and buried vias help design a PCB faster than other methods.
2. In the case of typical boards, these vias are compatible with the component density, and you don’t need to add more layers to your board.
3. Both blind and buried vias enhance the function of the HDI boards, providing high power. They are ideal for BGA components of precise pitch, as they provide a wide surface area, unlike the through-hole vias.
4. They are the best for a multilayered PCB, like a board with a minimum of 4 layers. These vias help where a through-plated via fails to meet the PCB performance requirements. These holes don’t have to face the density limitations of a typical PCB design.
5. They enhance the board density without a need to increase the PCB size. So, you can use the blind and buried vias for high-end PCB products. Such types of vias are ideal for consumer products or electronics.

Disadvantage

The blind and buried vias increase the overall cost of the PCB because of extra manufacturing work. So, they are costly than typical PCBs, because you need more time for hole drilling and other processes. Keep this factor in your mind before ordering your HDI circuit board with blind and buried holes.

Tips To Consider For Selecting The Right PCB Via

Both users and PCB designers should work together to bring the best product. The buyer should tell the designer about his requirements, like PCB components, size, type of via, number of connectors, etc.

Select A Suitable Type Of Via

You must choose the right type of via for a PCB. Like, if the board has several layers, go for blind and buried via. But, choose a through-hole via for a one-sided PCB. There are also other types of vias and the designer must know where to fit them.
Compatible Via Size And Tolerance

Generally, the PCB thickness determines the size of via it should have. A standard via has a 10 mil size that becomes 7 mils after copper plating. Whereas in micro via, you can have a 4 mil via, be it mechanically or laser drilled. Moreover, the hole or via should have enough size or tolerance to hold the connectors.

Compatible Technology

The blind and buried vias don’t go well on all boards. So, the PCB supplier must choose a stack up compatible with via technology, and the same goes to other via types.

Follow The IPC Guidelines

The designers should always consider the IPC guidelines in terms of technology. Like, they should focus on the right distance between vias in case of several layers. Every PCB supplier should have the IPC design guidelines to avoid any mistakes. The guidelines regarding Class 2, Class 3, Class 3DS are essential to consider as they are not similar.

Consider The Angular Ring Requirements

After drilling each layer’s pad, comes the stage of the annular ring and its requirements should be according to Class 2 and 3. The driller should know how to deal with tolerances while drilling through PCB.

The annular ring helps to have enough surface in the internal layers, maintaining the copper connection on a specific layer before a through-hole plating. Like, you should maintain the electrical connections keeping in mind the material and drill tolerances,

Micro Via Plating

When it comes to a micro via, you should give the right requirements to your PCB supplier. Like, how do fill via; through electrical or thermal epoxy and then copper plate it? This step helps to have a well-finished PCB, preventing vias from external elements.

The Drill File
Each connection has a via or hole that must be according to the drill file. In a blind via, the drill diameter and hole’s depth ratio should be 1:1; however, it can be more depending on the PCB thickness.
In the case of buried via, this ratio should be 1:12, but it can be more depending on the HDI PCB.

Other via Types

We have discussed the blind, buried, and through-hole vias, but there are also types of vias used for PCB design, so let’s study them.
Micro via: A micro via is smaller than all other vias. Even a naked eye can’t see it as it’s so small, so you need a microscope. They are used for a high-density PCB to provide more routing area.
A micro via reduces the issues, such as parasitic resistance that is common in the HDI boards. But, the micro via involves more time to drill and care, so the PCB designers prefer teardrops.
Stacked via: The stacked vias are also laminated and they are either buried or blind vias. A stacked via connects different layers on PCB. They appear to be on top of each other, so they are known as stacked vias.
Staggered via: the staggered vias are also used for multilayered PCBs, but they don’t overlap so we call them staggered. This via has a complex design but it involves less cost compared to the stacked via.
Skip via: The skip via is a hole that passes through different PCB layers but it does not have any electrical connection with specific layers. A skip via is either blind, buried, or overlapping.
Via-in-pad: It is common via used for large PCB pads, such as BGA or MOSFET. Such vias help to have components’ thermal dissipation. However, the designer knows if via in pad is suitable or not because it may affect soldering.
Whether it’s blind, buried, or some other via, you must hire an experienced PCB manufacturing company. The manufacturer should be professional and know the drilling techniques to make these vias.

PNC is providing top-notch PCB design and assembling services at affordable rates. Interested to know more about PCB Vias, write us at sales@pnconline.com

10 Best PCB Design Software

10 Best PCB Design Software

Circuit board fabrication, pc board assembly, PC Board fabrication, pcb assembly, pcb board assembly, PCB Design, PCB Fabrication, , , ,

As the electronic industry is growing day by day, the demand for better and efficient printed circuit boards is also increasing. With a massive growth in wearable technology, printed circuit boards need to be of high quality and accurately designed to perform well. As we know that every electronic device either large or small, completely relies on the printed circuit board. They function as the heart of any device. Any digital gadget you are using in your daily life, either it’s your smartphone or your smartwatch, or maybe a digital calculator or most probably a digital clock, this all is possible because of the evolution in the modern printed circuit board. The rapid growth in printed circuit boards has made it possible for engineers to decrease the size of the daily used gadgets and make them available in hands.

Complex devices such as smartphones and smartwatches and military applications, all require some specific kind of printed circuit board installed into them depending on the requirement. Testing the reason for designing a printed circuit board is a task that needs to be done carefully. Designing the printed circuit board means giving a physical existence to your idea of a printed circuit board. Engineers want to use the best software for the design sign of the printed circuit board. For a better designing experience, much software is designed to help the engineers in making the best designs.

There are several choices available once you start searching for the best software to design a printed circuit board. But you need to know certain factors before designing your circuit board. Let’s look into this.

How to choose the right software for designing a PCB?

As we have discussed before, with the increasing demand for wearable technology, the demand for the best-printed circuit board design is increasing accordingly. And this process needs to be taken care of because printed circuit boards act as the main core function of any device whether it is small or large. Now the question may arise why designing is so important before the manufacturing process of printed circuit boards. The simple answer is to avoid problems.

Once the design is not done right, it can cause several problems after and before the manufacturers of printed circuit boards. It may cause the failure of the entire system which is not acceptable. So simply means to say that the design affects almost all the aspects of the circuit board. If the design is not right for the device if the material is not according to mark if the traces are not put correctly if the vias are not connected properly then the circuit board will not work or may work in some unexpected ways.

The problem may happen as lack of desired functionality and overheating which can further lead to devise failure. So, the key to success is to design the right software. But as you have seen, the market has grown up so immensely, it is not possible to choose the best software according to your requirement at once. Instead, you need to research certain factors so that you can make sure that you are choosing the right.

Easy to learn:

Well, this applies to almost every device. Even if it is not specifically electronics, it should be easy enough that it can be learned so fast. In other cases, it would overwhelm the user and the user will get distracted or lose his interest. So, the best software should be in easy language, not coding but the basic understanding should be done with keeping the user view in mind. Moreover, the learning period should be shorter as well as easy. The shorter the learning curve is, the sooner the user can start using the software. So, it is compulsory to keep the user interested in your hands.

On the other hand, a steeper learning curve means the longest period on how to do the program. In this way, the user will learn for so long without implementation and this is not the desired phase. For achieving the best experience, the user must be hitting the ground sooner by keeping the learning curve shorter. But you need to ensure that you are not compromising on specific features of the software.

Easy to use:

At first glance, the user is not looking toward the amazing features, component libraries, and automation, instead, he is looking at the ability of how easy it is to use the software. The level of its complexity will let the user decide if he should be going with a particular software or not. The developer needs to deep down the subject from user intuitiveness to accessing tools easily, this is a wide topic and difficult to handle. If the user’s interface and view of using and accessing the tool are easy then your software is the easily available choice.

The number of clicking and Keystroke should be kept as minimum as it can to avoid ambiguity in the software. Moreover, designing software by keeping the lay audience in mind is also a good approach. In this way, you will intentionally keep the software as easy as possible.

Cost:

Although the features, learning period, and complexity of using software also matter in the market, the main thing that matters is how much it costs. The cost is something that a user is going to see at first. So, it should be kept in mind that your features are not crossing the cost limit. It should be cost-friendly so users can purchase it immediately for an easy design experience.

Now you have enough idea how to choose the best software in the market for designing printed circuit boards. Let us see the best available software in the market in 2022 that you can choose without thinking for a minute.

EAGLE (Easy Applicable Graphical Layout Editor)

Eagle helps in the design of electronic EDA. It helps the designers of the electronics field specifically in designing the best-printed circuit board design by allowing them to connect different schematic circuit board diagrams. The other main feature of an eagle is its user interface which is so user-friendly and designed by keeping the lay audience in mind. It also helps in transforming the vision into files with the help of stimulation and then the Printed Circuit board Fabrication process.

Altium Designer:
Altium is another best design software for printed circuit boards. It is no less than the eagle and mostly both are compared on behalf of features because both offer easy functionality. Altium offers both 2D and 3D toggles depending upon the designer’s needs. STEP model is followed for working in Altium.

Moreover, the PCB design can be improved by using the previous designs available. The 3D model is monitored by accessing mechanical data. Additionally, Altium allows the exchange of data with MCAD systems.

Kicad:
The best feature of Kicad is that it is open source. So new features can be added daily. Many intelligent designers are contributing to the software, and it is increasing its functionality day by day. The other advantage is its easy user interface. Its first view is so user-friendly that it helps the user in maintaining the flow. Moreover, it can be run on Windows and Linux.

EasyEda

EasyEda is the best designing tool which is both web and cloud base. It is zero-install integrating schematic capture and PCB layout can be designed in a seamless browser environment.

Allegro

Allegro is the most reputed software available in the market and is commonly used by large companies that make motherboards. It was launched by Cadence. This software has features that help in designing large motherboards. That’s the reason this software holds considerable market shares for computer design software.

WG

WG mentor introduced WG in 2005 and it was windows based. As the layout of the software should be great to manage the PCB design. So according to layout WG is the king of all software as it manages the layout most professionally. It is also recommended by many PCB designers.

Fritzing

Fritzing is also open-source software. It is designed to develop CAD software with the help of hardware design. As a hobby CAD helps designers and artists quickly move from design to prototype.

PADS

PADS Layout, PADS Logic, and PADS router are also included in the simple PADS software. It is the best for CAD layout. Its easy-to-use interface makes it the best choice for EDA.

ORCAD

Simply operation functions and strong stimulation make the OrCAD best for EDA development. OrCAD was developed in the 1980s and since then it is improved. It is recommended by electric designers because of its easy functionality.

Protel

Protel is also known as Altium and has the same functionality as we have discussed in Altium. It was introduced in the late 80s and since then it is ranked among highly used software for EDA designs. It is recommended because it has experience dealing with almost every design of PCB. It is released with its new features and leading the market in amazing manners.

So these are the latest software in the PCB design industry. Should you have any questions related to your design and or pcb assembly services, feel free to email us at sales@pnconline.com