In a message dated 02/22/2000 10:16:22 AM Central Standard Time, [log in to unmask] writes: << Lately I have been seeing failure analysis that indicates the failures were caused by trying to take a through hole component and bending the leads up and around or under the component body to make it a surface mount component. In one case a crystal seal was broken and another the bends were just too "springy". Is there a set of suggestions as to how and when and IF this can be done to a through hole component? Susan Mansilla Technical Director Robisan Lab >> Hi Susan! Was this crystal a metal canned crystal? There are a lot of oscillator and crystal manufacturers that form the leads on PTH clocks, oscillators, and crystals so they can be surface mounted. But what they don't tell everybody, is that you SHOULD'NT reflow them! They need to be hand soldered. These are through-hole parts and just can't take the heat of reflow...just call a few vendors and ask if they recommend reflowing the ones that are PTH and converted to a SMT type of lead. Maybe that's where the seal was compromised...during reflow? Just a guess... -Steve Gregory- ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################