George, Well said!!! David A. Douthit Manager LoCan LLC Wenger, George M. wrote: >Paul, > >You're not going to find any information on statistical occurrences of >Black-Pad events. Those that have had them don't want to talk about >them. It's almost impossible to quantify how prevalent the problem is. >Certainly if your board fabricator does a poor job of controlling ENIG >you'll see more occurrences. I know of three occurrences of Black-Pad in >my former company (Lucent) over a five year period and one occurrence in >my current company (Andrew) in the past three years. If I were to take >the number of occurrences and divide by the number of boards the >prevalence would be well down in the noise. However, when your customer >finds out that his customer's communications or internet system when >down because a component fell off your board, your customer gets >emotional and that one event is too much. If you haven't experienced >that one event yet it's hard to believe that immersion silver is a >better way to go. I'm biased. Eight years ago I believed that >immersion silver was a better way to go to insure reliability and >product quality and our experience has substantiated that belief. There >are two kinds of immersion silver users that I know of. One kind has >done their homework and decided that immersion silver works and the >other kind of immersion silver user is they type that just can't stand >another Black-Pad event. > >Regards, >George >George M. Wenger Andrew Corporation >40 Technology Drive, Warren, NJ 07059 >(908) 546-4531 [log in to unmask] > > >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Truit >Sent: Saturday, March 27, 2004 10:03 AM >To: [log in to unmask] >Subject: [TN] Black Pad Prevalence > >I have searched the archives and have found lot's of good info but >nothing in regard to the prevalence or the statistical occurrences of >this event. > >I have run tens of thousands of ENIG boards and I haven't observed this >defect but I am concerned enough to ask. Is this a board fabricator >controllable issue that has been minimized? > >Have you observed this phenomenon? How often will this occur? Is >immersion silver the better way to go to assure the reliability and >quality of the products? >-- >Paul Truit, Mfg. Eng. >RBB Systems, Inc. >4265C E. Lincolnway >Wooster, OH 44691 >Ph. 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