From: [log in to unmask] Date: Mon, 7 Oct 96 15:59:36 EDT Message-Id: <[log in to unmask]> To: [log in to unmask] Sender: [log in to unmask] Precedence: bulk Does anyone have experience with Surface Mount Soldering plastic TSOP packages? We are experiencing cracks in these SMT TSOP solder joints. The cracks start in the heel and propagate to the toe of the solder joint. Initialy these cracks were observed after the convection solder operation. We then reduced the amount of solder (6.5 mil height) and the temperature of the solder operation (205-210 C). Although the solder joints looked good after the SMT process they did crack after the subsequent wave solder process. The leads of the TSOP device are Alloy 42 (Kovar) fine 19.7 mil pitch. The PWB material is Multifunctional Glass (Tg 180). Edward Karnish Lockheed Martin Communication Systems [log in to unmask] phone 609-338-3182 ======================================================================== To learn more about this email exploder (majordomo), including how to unsubscribe from this list, send e-mail to: [log in to unmask] and place the command "help" in the body of the message - subject may be left blank. Help can also be obtained on the WWW at http://www.epic.lmco.com/Majordomo ======================================================================== *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************