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PCB Assembly and Board Tolerances

Category: PCB AssemblyPublished on 2017 May, 25Author Telan

When bringing a product to market, you want to have confidence that your printed circuit boards will hold up under all possible conditions: from extreme heat or cold to vibration. Your choice of New York PCB assembly service can have a big impact on the lasting quality of your board. Be sure your assembly service offers thorough testing with an eye on tolerances. These tests are a necessary part of assembly, ensuring your board is in working order.


When bringing a product to market, you want to have confidence that your printed circuit boards will hold up under all possible conditions: from extreme heat or cold to vibration. Your choice of New York PCB assembly service can have a big impact on the lasting quality of your board. Be sure your assembly service offers thorough testing with an eye on tolerances. These tests are a necessary part of assembly, ensuring your board is in working order.

Tolerances are very important during assembly: they make sure the board can work properly in certain situations without short circuiting, breaking, or shutting down completely. Tolerances also play a key role during the design phase, making sure the board’s components are balanced and won’t experience breakage or overload.

Tolerances and PCB Design

Before you even commit a board design to paper, you probably already known what you want the PCB to do, how it should be done, and a rough idea of where to place wires and components to make the best use of board space. It is a thing of beauty! However, what looks good on paper may not work in practice. That is why New York contract electronics manufacturer take certain tolerances into consideration:

  • Pad size and annular ring - These are the copper plating and radius of the entire pad.

  • Actual hole size - Holes that are being drilled into the board must have a certain diameter, length, and width. This is more important when using Surface Mount Technology than Thru-Hole Technology since, in the latter, the holes are pre-drilled.

  • Thickness of the whole board - This will depend on both the components you are using and the end use of your product. If a board is too thin, it cannot support heavy components. If it is too thick, it can be too large and/or heavy for your product.

  • Copper tracing and spacing - There must be air gaps between any copper features or components.

  • Tolerances of the aspect ratio - Aspect ratio is the thickness of the entire board divided by the diameter of any holes that have been drilled into the board.

These are just a few of the tolerances New York contract electronics manufacturers factor into PCB assembly and testing. The exact tolerance values vary depending on the project itself. When discussing your board with a New York PCB assembly service, these tolerances will be discussed and mapped out, ensuring the tolerances are perfectly balanced and the PCB itself meets its highest quality potential.


Telan Corporation: an Experienced New York Contract Electronics Manufacturer

Don't leave the quality of your PCB in the hands of amateurs. With over 35 years of experience, Telan Corporation knows what it takes to assemble high quality, efficient PCBs. Call us today at (215) 997-7603 and make us your New York PCB assembly partner of choice.

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