Are your pads round? I've seen bridging when the pads on the connector were rectangular or rounded rectangular. They should be run with the length of the connector parallel to the wave. Tom -----Original Message----- From: [log in to unmask] [SMTP:MIME :[log in to unmask]] Sent: Friday, August 13, 1999 3:31 PM To: [log in to unmask] Subject: Re: [TN] 50-mil pitch two row connectors << File: ENVELOPE.TXT >> -------------------------------------------------------------------------- -- Uday I saw a improvement when I changed from a No Clean flux 1.8 to 2 % solids to a Rosin based flux with 4 % solids, the number of bridging in paralel conectors decreased, the lenght of the leads are important also. A good DFM practice is put this conector in perpendicular direction with the wave ( unfortunally due to many reasons this is not always followed ... ). Once we have to "live'' with 100% bridging due to bad design. I saw at soltec site one device that makes a kind of localized touch up just after the lambda wave ( atached with the solder pot ) to remove bridging from components, I don't know if works well but it is another solution ... ( unfortunally my internet is down and I don't have the site address ) Jorge Dourado de Santana Maintenance / Process Engr Microtec - Brazil > To: [log in to unmask] > cc: (bcc: Shean Dalton/ElectrovertUS/Cookson) > Subject: [TN] 50-mil pitch two row connectors > > > > > Hello All > > We have 50-mil pitch two row TH connectors on some of our boards. The > direction of flow in wave is parallel to the row of pins. This part always > bridges on the last pins as there is lot of drag at the end. We also tried > to add a thieving pad at the end of the last pin in the direction of flow > to help, but the test results didn't help much. (only 50% yield). > > Does anyone has experience with this case? Any help is appreciated > > Thanks > Uday > > ############################################################## > 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 > ############################################################## > > > > > << File: pic05092.pcx >> ############################################################## 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 ############################################################## ############################################################## 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 ##############################################################