Top power supply PCB assembly guidelines!

By | Date posted: | Last updated: December 5, 2022
Power Supply PCB Assembly Guidelines

All PCB boards need electrical power; however the need isn’t just for more power but also clean power. That is something that is made possible by a successful PCB board design. With the right PCB design, clean, uninterrupted power can be provided to the circuitry. It is also important to remember that electrical power will generate heat & the heat, in turn, will impact the circuit board. A number of aspects therefore need to be kept in mind.

Before we look at some of the considerations that will lead to a cleaner power supply, it will be worthwhile to look at the kind of power supply available.

Broadly, power supplies are broken up into two main groups:

  • Linear power supplies are typically used in systems where the power requirements are lower. 
  • SMPS or Switch-mode power supplies are more complex as also more efficient. The thing to remember is that their switching noise can lead to EMI. SMPs, in turn, may be isolated or non-isolated. Non-isolated SMPs are further of the following types:
    • Buck – It steps down the voltage while the current is stepped up
    • Boost – It steps up the voltage while stepping down the current
    • Buck-Boost – It has elements of both & can step up or step down the voltage.

It is important to remember that since you will deal with high levels of current, the trace widths need to be adequate. Additionally, in order to control the noise, it is important to ensure that the component placement is optimized as the routing is short. Also the design needs to ensure effective heat dissipation. Let us look at some of the guidelines to be followed in detail:

PCB Power Supply Guidelines to follow:

  • When you are dealing with a multi-layered board, it is important to have the ground or power plane between the outer layer with the power supply components & the inner layer with sensitive signals. The ground plane offers electromagnetic shielding. In case it is not possible to devote a layer, a ground polygon is ideal. If you do go in for a ground plane, it is essential that the PCB power supply design is separated from the common ground. Also the connection between the two grounds should be limited to one point on the board. In the absence of this, you run the risk of ground loops.
  • It is imperative to keep the power supply parts close together so that the trace lengths are minimized. This will help to reduce any resistive losses as well as electromagnetic noise emissions. Where possible the use of polygon pours is recommended.
  • In terms of component placement, it is also important to separate heat-generating components from heat-sensitive components. Also using copper will ensure that heat is distributed from the hotspots and that thermal issues aren’t exacerbated. If you are dealing with a buck converter the input capacitor should be kept next to the IC. As for the output capacitor, it should be placed immediately after the conductor.
  • Speaking of heat dissipation, it is important to include proper cooling methods such as heat sinks, fans, thermostatic coolers & more. Heat sinks are, however, best used with a linear regulator.
  • As for the routing, it needs to have short, direct traces. As far as possible blind and buried vias need to be avoided as they add to the inductance.

To Sum Up

The above best practices will ensure that your PCB power supply is optimized. However, a key area remains, which is having the boards manufactured & assembled to these exact details. Choosing the right electronic contract manufacturer who can manufacture & assemble your boards as per these best practices is therefore essential. Among other things since the PCB requires tight placement, you need an experienced assembler who can take care of all the requirements. Typically, the manufacturer & the assembler need to be able to work with you at the design stage itself so that there are no manufacturability issues at a later date. An experienced manufacturer & assembler is also equipped with all the industry best practices that make sure that you do not need to reinvent the wheel or waste precious time, especially since quick time-to-market is a key competitive advantage in today’s times.

At Technotronix, we are fully equipped to handle your PCB manufacturing requirements. We follow industry best practices to ensure we deliver cutting-edge products. Our team of experts and state-of-the-art manufacturing facility ensures that all our PCBs meet the industry standards of quality and testing.

If you have any questions or any requirements related to PCB assembly, please feel free to contact us via email at [email protected] or call 714/630-9200.

How to create precise PCB assembly drawing quickly and efficiently?

By | Date posted: | Last updated: November 17, 2022
PCB Assembly Drawing

Precise PCB assembly drawings are the key to success for a PCB project. With detailed drawings, it is that much easier to get the exact output that you have envisaged. In creating these drawings, however, need you to keep a number of important aspects in mind:

PCB Assembly Drawing

1. Bill of Materials

A very important component of your design is the Bill of Materials. Among other things, it goes a long way in making available the component shapes and reference designators on the board that makes the assembly process seamless. You will also need to include mechanical parts that may need to be attached to mounting hardware. Besides the drawing needs to identify the exact components required as well as the materials. Manufacturing labels need to be identified as also referenced in the notes.

Some of the best practices to follow when a metal element needs to be used, for example, include:

  • Specify the metal to be used.
  • Specify the finish that the metal needs to have.
  • Specify whether it needs to be painted or powder coated.

It is also prudent to include additional views. The double-sided boards, for example, will benefit from providing a view of the front and back of the board. Also, where mechanical parts are being added, expanded views will help provide clarity.

The more details you provide, the more the board will live up to your specifications. As they say, “God is in the details!”

2. Specify the dimensions

It is imperative that all dimensions are specified in detail. To do that, it is best to use a CAD program. A board design software such as Altium or PADS works well.

In a wiring diagram, it is also important to demonstrate the connections for custom cable assembly as well as the type of termination that needs to be used.

The use of the right software makes sure there is precision & the final assembly lives up to your specifications.

3. Ensure you attach relevant files

When it comes to PCB assembly, it is essential for the contract manufacturer to have the following files:

  • Gerber Files
  • Drill Files
  • Silk Screen Files
  • Placement & Drawings Package

Ensuring that the assembler has the exact details of where the holes need to be drilled and where the components need to be placed will ensure success of assembly.

4. Detail the testing requirements

It is important also to think through the testing at the outset and indicate the same to the PCB assembly partner. That way there are no rude surprises at the end.

In fact, it is extremely important to specify to the contract manufacturer whether you will be requiring programing. In which case, the programming files will need to be included and the exact programming will need to be specified.

5. Any special PCB assembly drawing requirements

You also need to think through any special requirements of your project and add a quick note in the drawings. Some examples of the special requirements to be mindful of, include:

  • Whether you require lead free assembly.
  • Any special requirements when it comes to packaging of the product.
  • Export documents that are required, in case the product is being exported.
  • Any other Assembly notes that could include industry standards and specifications, special feature locations & more.

To sum up

While a lot of these details go in to successful PCB assembly of the board, you may also find the process daunting. The good news is that there are PCB design systems available that use automation to create drawings. These tools go a long way in saving time and energy while ensure that the drawings are extremely robust. In short, these tools with their powerful automation help you create PCB drawings, both quickly & efficiently.

The choice of the right PCB contract manufacturer is also extremely crucial in making your PCB assembly process, a success. Armed with experience and industry best practices, they ensure that you do not have to reinvent the wheel. Any flaws in the design are pointed out by their engineers in the early stages saving you from costly errors that accrue from discovering these issues once the product is ready to be shipped, or worse still when it has already hit the market.

Technotronix offers professional PCB Assembly services with 40 years of expertise. Our accurate PCB assembly process meets the quality standards, including ISO-9001:2015, RoHS, and more. If you have any questions or any requirements related to PCB assembly service, please feel free to contact us via email at [email protected] or call at 714/630-9200.

Request PCB assembly quote for your any type of requirements.

Why PCB assembly service quotes are essential for your PCB projects?

By | Date posted: | Last updated: April 19, 2023
PCB assembly service quotes

Once you have a PCB design in place, you need a competent manufacturer who can bring your design to life at a price point that works for your project. It is important therefore that you ask for a PCB quote before the fabrication can kick off.

To get an accurate quote, however, it is important that you provide the manufacturer with the relevant information. Let us look at what a PCB assembly service quote consists of.

PCB assembly service quotes

Essentially, a PCB quote offers an accurate estimate of the cost of fabricating a board as also the timelines involved. A quote can be made available for both PCB fabrication as well as PCB Assembly.

It is necessary that you give accurate information about the project for both the price as well as the timelines to be accurate.

A PCB assembly quote, for example, will come with vital details such as:

  • Type of material
  • Number of holes
  • Number of layers
  • Board dimensions
  • Trace width
  • Finishing of copper layer
  • Space between traces, and more.

Required documents for PCB assembly quote

The accuracy of the quote depends on the availability of the following documents:

1. Bare Board Print or Fabrication Drawing

It offers information related to aspects such as:

  • Board thickness
  • Number of holes
  • Dimensions, and more.

It is also important to include details of the component numbers in this document. Along with this you also need to make available the Gerber Files.

Pro tip- Ensure that design files are made available in a format such as ODB++.

2. Bill Of Material

Bill of material is yet another crucial document that among other things carries relevant information about the components. The more detailed it is, including aspects such as description of parts, part number, reference designator & more, the smoother the entire process.

3. Assembly Print

With an Assembly Print information about the location of parts can be conveyed. It also contains special markings if there are any.

4. Approved Vendor List

An approved vendor list along with part number of the manufacturer is ideal.

Information that is often missed when requesting for a PCB assembly quotes

The following are some of the information that is often missed:

1. Stack-up details

This comprises of details of number of layers, thickness of layers as well as of the stack-up.

2. Solder mask details

These details include the type of solder mask, its finishes and more.

3. Impedance details

With impedance details not being provided; their implications are felt on several aspects of the board.

4. Cut-out

The dimensions as well as the position of the cut-out are imperative in receiving an accurate PCB assembly quote.

5. Silkscreen

Where to apply silkscreen & its color are also essential details.

6. Surface finish

The type of surface finish has a strong bearing on its cost. It is therefore imperative that it be clearly mentioned.

Factors that affect PCB assembly cost

Some of the other factors that impact PCB assembly cost include:

1. Mounting Technology Used

The use of SMT (Surface Mount) or through-hole PCB assembly technology has a bearing on the cost. Also, Surface Mount technology is faster as it uses a lot of automation.

2. Lead Time

In case your lead times are short, it has a bearing on the cost of the PCB assembly. The two clearly are inversely proportional.

3. Shipping Costs

Large PCB quantities may come with additional shipping costs.

4. Number of Layers

It typically costs more to assemble multilayer PCBs (Printed Circuit Boards). This is because the number of production steps has increased significantly.

5. Surface Finish

The choice of surface finish as already indicated has a strong implication on the cost. Some of the surface finishes come with longer shelf life and at a higher cost.

To Sum Up

While a PCB assembly quote is important for you to plan the efficiency of your project, its accuracy depends on a whole lot of factors. It is important that the details must be correctly provided so that the PCB assembly quote can be exact.

Needless to mention, however, that the quote cannot be the sole reason you go with a certain contract manufacturer. It is imperative that you ascertain the experience and quality offered so that there are no costly errors to deal with at a later stage.

To avoid such errors, you can contact Technotronix at [email protected] to get innovative PCB assembly services. With an experienced team, Technotronix provides reliable PCB services including PCB fabrication, assembly, and PCB design. Get a quick PCB assembly service quote for any kind of requirements.

What you should know about PCB design for assembly guidelines?

By | Date posted: | Last updated: November 11, 2022
PCB Design for Assembly Guidelines

The importance of designing boards that have ease of manufacturability cannot be overstated. After all both the cost as well as the time taken in manufacturing is high & hence any errors at the design phase can prove to be costly as they could lead to assembly rework.

For seamless designing, it is important that the designer understands the assembly requirement from end-to-end. Following the right design for assembly practices are therefore critical. Let us look at the reasons why DFA guidelines are very important.

What is the importance of PCB Design for Assembly Guidelines?

It is important that the PCB layout and design lends itself to ease of manufacturability. The many issues that can arise during the manufacturing process include:

  • Component availability – If the components aren’t readily available the cost of manufacturing can increase. Additionally, it will also add to the lead time that can go a long way in impacting quick time-to-market & in turn, your competitiveness.
  • Part Placement – The right placement of parts is extremely important as it can drive up costs. Issues such as how the component rotates also go a long way in impacting solderability.
  • Layout – Since the PCB has to connect to other boards or interfaces, it is important that these aspects have been considered.

If the design of the board adds to its manufacturing expense, it can render the project unviable. In fact, this aspect becomes extremely important particularly at the prototype stage as if the design isn’t optimized it will lead to issues at the mass production stage. Alternately, you will waste time going back to the drawing board & re-designing the prototype.

PCB Design Guidelines for Seamless Assembly

Some of the PCB design for assembly guidelines that are extremely important include:

  • Ensure that the components that your design incorporates are easily available. It is critical to check that end-of-life parts are not incorporated as they can waste precious assembly time as also increase your expenses.
  • It is recommended that all SMT parts are put on one side of the board as having them on both sides will add to the costs.
  • Solderability of the board gets impacted if unusually sized parts are used. Additionally, as far as possible such parts should not be juxtaposed with smaller parts.
  • Ensure that components aren’t placed too close to the board edges especially when you are dealing with small boards as these can cause issues in taking the boards out of the panels.
  • As far as possible, an orthogonal placement of parts needs to be undertaken.
  • In part placement their solderability needs to be kept in mind. There needs to be enough room for soldering fixture development.
  • It is important that test probe points be provided for testing & debugging
  • The connectors should be placed optimally. Additionally there must be enough room to plug & unplug cables during assembly.
  • Last but definitely not the least, it is imperative to work closely with your electronics contract manufacturer at the design stage itself for your PCB design to work seamlessly at the manufacturing stage.

The important role your contract manufacturer can play!

It is important that your CM is involved at the design stage to be able to review your design. That way the CM will be able to guide you about component selection. In turn, this will mean that you will not have to contend with a delay in the availability of parts. Additionally, the other advantage that will accrue is that they will be able to help you with optimal placement of components that will increase the manufacturability of the board. Done well this will have a positive repercussion on:

  • Cost of boards
  • Cycle time, and more.

In fact with the right contract manufacturer you will be able to tide over any difficulties including manufacturing boards that are highly complex. Armed with industry best practices they will be able to help with design & documentation that can ease manufacturing. Also, needless to mention that the right contract manufacturer will be able to offer you both low as well as high volumes as per your bespoke requirements.

Technotronix offers PCB manufacturing services with 40 years of expertise. We follow industry best practices to ensure we deliver cutting-edge products. Our team of experts and state-of-the-art manufacturing facility ensures that all our PCBs meet the industry standards of quality and testing.

If you have any questions or any requirements related to PCB design for assembly, please feel free to contact us via email at [email protected] or call 714/630-9200.