LISTSERV - TECHNET Archives - LISTSERV.IPC.ORG

TECHNET Archives

January 1999

TechNet@IPC.ORG

	LISTSERV Archives
	TECHNET Home
	TECHNET January 1999

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]

Subject:	Re: IPC-2221 and 2222
From:	Clifford Maddox <[log in to unmask]>
Reply To:	[log in to unmask]
Date:	Tue, 19 Jan 1999 18:50:15 -0800
Content-Type:	text/plain
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
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
> To subscribe:   SUBSCRIBE TechNet <your full name>
> To unsubscribe:   SIGNOFF TechNet
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
> ################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################

ATOM RSS1 RSS2

LISTSERV.IPC.ORG