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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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PCB Part pin placement
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I have a gas sensor part with 4 pins placed around a 13.5mm diameter circle. 3 of the pins I have figured out how to make my PCB cad symbol, but I do not know where to locate the pin labeled CO Working.
Statement: This post is only the personal view of the author and does not represent the opinions of

Nigel Nichols

I'd contact their support and mention that its not clear. They may email you a dimensioned drawing or provide a link to their CAD drawings.

Javier Martínez

It is really a poor datasheet for the pin layout. You have three choices: 1) Buy the product and measure it. 2) Contact the company where you bought from. 3) Extrapolate from that design and others on the site and take a chance. I did the latter based on the symmetry of the right 3 pins:

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