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Sender:	TechNet <[log in to unmask]>
X-To:	Paul Greene <[log in to unmask]>
Date:	Tue, 19 Jan 1999 18:50:15 -0800
Reply-To:	[log in to unmask]
Subject:	Re: IPC-2221 and 2222
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From:	Clifford Maddox <[log in to unmask]>
Parts/Attachments:	text/plain (40 lines)

Interesting questions:
1) From my understanding DSCC has not yet adopted IPC-2221/2222 as replacements for IPC-D-275.  This may be
revelant depending on your customer.

2) The formula in IPC-2221/2222 are a major change from those in IPC-D-275 in that they do not take part
size, layer count , copper weight into account when calculating minimum land diameters.  Land (pad) areas
which would be way too small under IPC-D-275 are OK under 2221/2222.

Progress marches on.

Paul Greene wrote:

> IPC-D275 has design guidelines for land area versus hole size. 1) Is
> IPC-2221/2 a replacement for D275 and 2) can anyone tell me if these land
> size design specs have changed if this is in fact the case? Thanks,
>   Paul Greene
>
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