Category:PCB PCB Design Rules

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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

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Flex PCB Design:Five Critical Drawing Requirements Reply 2017-02-15 18:29:19


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Closely following the design guidelines and meeting all detailed drawing requirements, you can avoid revisions and delays of your PCBs, and fully benefit from quickturn PCB manufacture. Here are some drawing requirements to optimize your flex PCB design.

The Basics

First of all, the following elements must be included in your design. These include: layer count, finished board thickness, PCB materials used, surface finish. These are obvious requirements but occasionally go overlooked.


Board Construction and Layer Orders
Board construction and layer orders differentiate between layers containing rigid material and layers made of flexible material, like copper thickness. Without board construction and layer orders, the PCB manufacturer has to reconnect the customers and the leading time will be longer. 


Specific Design Requirements
You may have some unique PCB design requirements when it comes to prototypes in areas like Internet of Things. In order to minimum potential delay in leading time, these should be included as part of the design drawings early in design. Communication between designers and fab houses before manufacture will make the whole process faster, no confusion or delays will occur.


A Drill Symbol Chart
In your PCB design, a drill symbol chart is necessary to indicate all of the finished hole sizes, as well as the tolerance. +/- .003" is the standard finished hole size, but this is never assumed. Thus, this measurement must be stated on your design drawing.



It is impossible for PCB designers to predict all of the potential ways that a circuit board design might go awry and prevent them in advance. Thus, the flexibility of designs is highly appreciated and in demand. Designers sometimes will reject to alter their designs, even when PCB manufacturers offer some valuable suggestions. If you're not sure whether the suggestions are applicable to your PCB design or not, just ask the fab house to explain for you about the potential issue.

These drawing requirements aim to help you build strong cooperation with a PCB manufacturer. If you have worked with industry-leading PCB manufacturers, remember to take good use of the expertise and guidance they offer and be open to suggestions.

Statement: This post is only the personal view of the author and does not represent the opinions of

Travis Kneale

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Your post answered my questions. Thanks a lot.