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High voltage PCB trace separation

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themaccabee

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Hi,

I 've got a PCB in which 85V is being generated.
I would like to know how much minimum trace separation needs to be maintained between this 85V trace & other traces (say GND).
(The current rating of this 85V supply is 50mA only)
Thanks ,
Regards
 

nelsonys

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It depends on the standard that you are complying. For eg. IPC2221 or UL standard.
Besides is this a product? Or your own hobby circuit?

If it is just for normal use, 1-2mm would be suffice for creepage distance. In fact, 2mm is a bit harsh already.
 

mayank.bhaintwal

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current rating is very small.u hav to give thick plane 4 power signals with minimum .1mm nd max .5 mm spacing is sufficient.
 

nelsonys

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I guess current has nothing to do with clearance.

We decide trace width according to current, and clearance or creepage according to voltage.
 

andre_teprom

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The bandwidth of signal also must be considered.
Higher frequencies components of signal can propagate in dielectric air more easilly.

+++
 

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