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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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Automotive electronics PCB layout questions
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Vojtek Gábor

I am studying an ESP sensor cluster, and I have a look at the PCB inside. But there are some questions about it. 1. why do they use only one trace to connect the resistor to the ground? 2. why don't they use teardrops at the trace/via junction?
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Earl Swope

Adding the extra + connections to the resistor is with little point, especially if there is little current through it. Teardrops may not have been supported by their PCB design software. I use Eagle, and they are not available.


There is no large current requirement here. If this was a Through-Hole Part, it would be done similar to this for thermal reasons.


For your second question,it is because teardrops are used to reduce the chance of acid traps and perhaps reduce mechanical stress on the trace and via. However, they are not typically necessary.

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