Steve, You don't state what type of reflow process you are using. If your reflow oven is an IR unit, your body temperature could be exceeding the stated maximum. The organics, e.g. the IC body, will reach a higher temperature than the leads in an IR unit. Have you tried profiling the body temperature? Gary Camac Dickey-john Corp. [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: ASSY: Profiling parts. Author: INTERNET:[log in to unmask] at CSERVE Date: 5/28/97 11:15 AM Sender: [log in to unmask] Received: from kani.wwa.com (kani.wwa.com [198.49.174.58]) by dub-img-8.compuserv e.com (8.6.10/5.950515) id LAA28453; Wed, 28 May 1997 11:15:31 -0400 Resent-Date: Wed, 28 May 1997 11:15:31 -0400 Received: from ipc.org/ipc.ipc.org [209.42.29.23] by kani.wwa.com with smtp (Smail3.2.WWA) id m0wWkQj-003vP9C; Wed, 28 May 1997 10:14:48 -0500 (CDT) Received: by ipc.org (Smail3.1.28.1 #2) id m0wWkHF-000BjBC; Wed, 28 May 97 10:04 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> Date: Wed, 28 May 1997 10:14:23 -0500 (CDT) Message-Id: <[log in to unmask]> X-Sender: [log in to unmask] X-Mailer: Windows Eudora Pro Version 2.1.2 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: [log in to unmask] From: Steve Quinn <[log in to unmask]> Subject: ASSY: Profiling parts. Resent-Message-ID: <"vRhDF.0.BOG.ob4Zp"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/12963 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] We have profiled an IC, which we are now seeing failures on. The max temp on the leg of the part was 217 C. We have been told by our supplier that the max temp for the part is 221 C. They are saying we are reflowing solder internally, which causes a short, and the failure. My question is, does anyone have a good idea of what the correlation is from external temps on the leg of a part, to the internal temps of an IC. Thanks for any ideas or data to prove us right or wrong. Steve Quinn Heurikon Corp Madison, Wi 608/831-5500 [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************