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PoJD / can-pcb

Custom PCBs to be used for CAN bus in my home automation project
MIT License
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Confirm small components lead width #21

Closed PoJD closed 6 years ago

PoJD commented 6 years ago

At times it seems the resistors at least have too much space around them in PCB causing the soldier to run through. Check data sheets for both resistors and capacitors and other components and confirm/adjust the lead width

PoJD commented 6 years ago

male pinhead seem to have 0.64 lead width as opposed to 1 in all packages I checked so far. Similarly capacitors seem to have 0.5 instead of 0.8 for all I have bought so far. XTAL has 0.43mm. R has 0.56mm.

PoJD commented 6 years ago

https://electronics.stackexchange.com/questions/85292/what-pad-hole-drill-size-is-appropriate-for-a-given-through-hole-lead-diameter has a nice way to fit the hole sizes. I have all chips through hole and transceiver already confirmed as fine, so confirm the rest

PoJD commented 6 years ago

Seems even transceiver and chip may be worth checking?

PoJD commented 6 years ago

Using 0.8 for pinhead, 0.7 for R, 0.6 for capacitors and 0.5 for XTAL (taking into account drill size tolerance of +-0.05 in all parts and some in PCB manufacturing process too.

PoJD commented 6 years ago

transceiver and through hole chip both ranked down from 0.8 to 0.7

PoJD commented 6 years ago

Chip and transceiver through hole actually should use the original 0.8 since the leads are not round but rather rectangular. The diagonal is actually 0.67, so with the tolerance, 0.7 may end up being too small. So rather change these 2 back to original values.