Hi Joel,
You should not rely on the IPC specification, instead read the relevant
safety standard(s) for the country(ies) to applicable to your end market
and product class.
Regards
John
On 20/01/2016 19:55, Joel Brown wrote:
I am designing a power supply circuit that can have voltages up to 100 VDC.
According to IPC-2221 I need 0.6mm spacing for uncoated traces and 0.13mm
spacing for traces with a polymer coating. IPC-2221 doesn't really define
what a polymer coating is and if solder mask is considered one or not. Our
board house uses Taiyo PSR-4000BN soldermask. According to the data sheet
it has a dielectric strength of 500V/mil minimum. Going by that we could
have very small spacing between traces and be ok at 100 VDC. Some boards
that were designed on a previous project did not meet the IPC 0.6mm spacing
but were deemed ok because there was solder mask on the traces. I am not
sure this is a good policy to follow going forward.
Thanks
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