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March 2014

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Subject:	IPC-2221B Electrical Spacing
From:	Larry Brophy <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Mon, 10 Mar 2014 14:26:17 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (16 lines)

Hi all, is there any table besides Table 6-1 in IPC-2221B that I can use for the layer seperation that takes into account the voltage resistance of FR4.  I know FR4 is good for 300V per mil and I need 500V isolation, if I use Table 6.1 I'm going to need  9.74mil between layers and have a very thick board.

I have a customer that wants the design to be Class 3 and insists that I use this table unless I can find something in an IPC spec that allows me to use the voltage resistance of FR4 instead of this table.

Many thanks,

Larry

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