Mark, thanks for the interesting information. What process do you use to electrical test the diode during insertion? Thanks Jason Larson -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Ross, Mark Sent: Wednesday, August 02, 2000 8:41 AM To: [log in to unmask] Subject: Re: [TN] diode failure summary Jason, We had this happen to us in the past. Here is the first thing to ask your vendor: "Did you change which facility finishes the encapsulation?" If you take the die, add leads, do the encapsulation and everything is running just fine and then have this happen out of the blue ask them this question first. In our case, they moved from a facility that had been doing it for years, to one in India which had not ever done it and the resulting failures (lucky for us) showed up during insertion (we read the axial components electrical values during insertion). If this is not the case, there is something that I have seen lead to this before. The first is not well documented in a lot of data sheets nowadays, however there is a minimum lead to bend ratio that must be followed or else you can stress fracture the unit at the die level and it could open or it could short, it depends. Make sure that the minimum lead length before bending is being followed. This MUST come from the manufacturer. We had a rule that no 1W zener diodes could be placed at less that 1/2 inch total part span if the diode was glass encapsulated and no shorter that 0.450" if it was encapsulated like a rectifier diode. Any shorter would lead to eventual failures. Mark Ross Electronic Design Engineer Innovative Home Products Inc. -----Original Message----- From: Jason Larson, AScT [mailto:[log in to unmask]] Sent: Wednesday, August 02, 2000 11:24 AM To: [log in to unmask] Subject: [TN] diode failure summary Well the original attempt at sharing the pictures wasn't good, so lets try again!! <http://www.driveway.com/share?sid=8a88c806.9c647&name=Electronics> Jason Larson ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################