Common PCB Problems Your PCB Manufacturer Should Be Avoiding!

By Mer-Mar Electronics Date posted: Last updated: January 20, 2023
common pcb problems

With the PCB being a crucial component that ensures smooth working of an electronic device, maintaining the quality of PCBs is an important task. Any defects can lead to expensive errors & can cost the company and its reputation.

Here are some common PCB problem that manufacturers need to avoid. Needless to mention that experienced, professional manufacturers, have the necessary checks & balances to ensure that the production process is seamless.

Common PCB Problems

1. Acid Traps

As their name suggests, acid traps refer to small pockets of spaces where an etching solution that is used to remove excess copper, gets trapped. These acid traps result in corossion as well as faulty traces. One of the reasons that cause acid traps includes trace bending below 90 degrees.

Some of the validation checks that help control this issue include:

  • Checking for sharp corners that could act as potential traps.
  • Checking for absence of teardrops where a breakout of vias is possible.

2. BGA Spacing

During BGA assembly, BGA components are an essential addition to PCBs, they can cause a number of issues. For example, pads for the ball grid are under the die, or spacing around the BGA pads isn’t proper.

Some of the validation checks in this area include:

  • Ensuring enough clearance space around BGA pads. The through-hole vias need to be positioned at the center of the four BGA pads.

3. Tombstone Effect

As its name suggests, tombstone results when the component is lifted from one end, giving it the appearance of a tombstone. This is largely caused when the wetting isn’t accurate.

Some of the validation checks that help control this issue include:

  • Ensuring that the connected copper at the pads are within the allowed limits.

4. Test Point Existence

A test point is used to test the state of the circuitry. If adequate attention isn’t paid to test points, it leads to a situation where at the manufacturing or the PCB assembly stage, errors are hard to diagnose.

Some of the validation checks that help control this issue include:

  • Ensuring that test points have been incorporated at the design stage.

5. Visual Features

It is important that the overlay layers contain relevant information such as:

  • Reference Names
  • Component outlines, and more

Oftentimes errors occur on account of factors such as reference names of passive components being placed on top of pads or sometimes even under a component.

Some of the validation checks that help control this issue include:

  • Ensuring that the reference names are accurate, as is the order.
  • Checking for the first pin mark for Complex ICs
  • Ensuring that the reference names are placed correctly.

Areas Where Common PCB Manufacturing Defects Arise

Besides these common issues, it is important to broadly remember that manufacturing issues can arise in three broad areas:

1. Material

The manufacturer needs to be aware of the fact that certain materials work for certain circuits. The choice of the wrong material can severely impact signal integrity. Similarly, the operating environment has a lot to do with the choice of material.

YOU MAY ALSO LIKE: Material to Consider While Manufacturing Lead-free PCB

2. Components

In choosing the components several issues need to be kept in mind, including but not limited to the lead time of the components. Choice of components with long lead times can affect the time-to-market & hence competitiveness.

3. Design

Issues with design include aspects such as:

  • Not including fiducials for fine pitch parts
  • Not having enough clearance
  • Components placed too close to each other, and more

The use of robust design for manufacturability practices can go a long way in ensuring that such design issues are avoided. The choice of the right CM is also crucial as they will be best placed to point out any such issues.

It is important to remember that it is only a manufacturer with robust expertise who can take care of these nuances. Such manufacturers are equipped with industry best practices & can ensure that you do not have to reinvent the wheel.

Choosing Mer-Mar Electronics as a contract manufacturer is the first step towards ensuring seamless manufacturing of your PCB, no matter how complex it is. With 40 years of experience & expertise, we are a reliable manufacturer who provides PCB assembly and PCB fabrication service with a quick turnaround time. Fill out the form below to request a free quote now.

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