Tom, I agree with Bruce. AMP has many papers on connector contacts. I will fax you what I have. The bibliography is a good starting point. --------------------------- John Laur Rockwell Automation Allen-Bradley Co Inc. 1201 South Second Street Milwaukee, WI 53204 +1 414 382 2162 (fax) +1 414 382 2393 (phone) [log in to unmask] --------------------------- >From [log in to unmask] Mon Jul 31 12:42:47 1995 Return-Path: <[log in to unmask]> Received: from cgc9.eda.mke.ab.com by eda.mke.ab.com (4.1/SMI-4.1) id AA15271; Mon, 31 Jul 95 12:42:45 CDT Received: from miso.wwa.com by cgc9.eda.mke.ab.com (4.1/SMI-4.1) id AA26853; Mon, 31 Jul 95 12:40:21 CDT Resent-Date: Mon, 31 Jul 95 12:02:53 EDT Received: from ipc by miso.wwa.com with uucp (Smail3.1.28.1 #8) id m0scypp-000FQqC; Mon, 31 Jul 95 12:41 CDT Received: by ipchq.com (Smail3.1.28.1 #2) id m0scxfT-0000GnC; Mon, 31 Jul 95 11:26 CDT Old-Return-Path: <miso!VNET.IBM.COM!bhoughton> Message-Id: <[log in to unmask]> Date: Mon, 31 Jul 95 12:02:53 EDT From: [log in to unmask] To: [log in to unmask] Subject: Re: Tin/tin vs. Tin/gold sockets Resent-Message-Id: <"RR2tY2.0.EOG.cGG7m"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/764 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] Content-Length: 6641 X-Lines: 84 Status: RO FROM: BRUCE HOUGHTON 27/552/844/TOR Phone (416) 448-5701 Tie 778-5701 Subject: Re: Tin/tin vs. Tin/gold sockets Tom, I suggest contacting the various connector suppliers, such as AMP Burndy etc and get their input on your request. I expect they will highly recommend NOT mixing dissimilar metals. The tin will oxide and crate an increasingly higher resistance, which will at some point start to cause noise problems. The two metals can also create an electrical potential (battery) across the joint which can also affect the electrical signals. Bruce Houghton Celestica, Inc. Bruce Houghton Staff Engineer, Celestica, Inc. Internet: [log in to unmask] *** Forwarding note from SMTP2 --IINUS1 07/26/95 10:47 ***