Electronics Forum | Wed Jan 05 11:01:37 EST 2000 | Ron Lahat
I have in design a 400mm x 400mm pcb 3.0 mm thick heavily populated with BGAs 50 mil pitch and want to run a double sided reflow process with overlapping BGAs (CS/PS) 1. can I avoid a selective jig for PS BGAs?(weight calculation ?) 2. Is it possibl
Electronics Forum | Tue Jan 04 15:38:19 EST 2000 | Pat Pepper
Hi everyone: Our company is trying out immersion white tin for fine pitch assembly with what I would call mixed results. Reflow solder looks very good, but wave solder looks somewhat grainy (this may not be a problem in actuality). We had dewettin
Electronics Forum | Tue Jan 11 10:01:30 EST 2000 | Wolfgang Busko
Hi Pat, we had white tin boards laying around for about 10 month with no extra protection than the plastic bag that they were shipped in. Never thought of using them for there was a relayout planned to fix some serious bugs. But that�s life, relayo
Electronics Forum | Fri Jan 14 08:05:23 EST 2000 | Pat Pepper
Hi Dave, Thank you for the response. In answer to your responses I'll use the original numbers of my questions. 1. We would like to turn around our boards fast, but sometimes due to the market conditions we wind up with inventory. After reading
Electronics Forum | Mon Jan 03 11:00:25 EST 2000 | Brian W.
At my last company, we installed in-line testers. They worked very well, but there were some issues to be addressed; 1 - Boards had to be cool enough to go through ICT or we had false failures. 2 - We used no-clean flux...enough said about that. 3
Electronics Forum | Thu Dec 30 21:22:12 EST 1999 | Jim
Mike, Thanks for the reply. It's not really a matter of slope. It is the long term thermomechanical fatigue that the solder joint undergoes as a result of repeated severe temperature swings, while the product is in use. Non-leaded parts are suscep
Electronics Forum | Sat Dec 18 01:42:57 EST 1999 | sin
Do you have strong technical support team that have related experience SMT EQUIPMENT in your company? If you do, use machine would be alright. If you don't, you need to hire afew because even with brand new machine, you still have a problem either
Electronics Forum | Mon Dec 13 08:33:16 EST 1999 | taff
Hi I'd like to ask how everyone routes their differential pairs. I'm not about to condem anyone's software ( SW Vendors should maybe take a look at the answers ) but I'm interested how PCB Designers route a board with 256 pairs, 150 microns width an
Electronics Forum | Fri Dec 10 10:49:24 EST 1999 | Mike F
Some of our boards have over 700 LED's, so looking for the long leads is the most accurate way to check polarity. Also, not all LED's have a flat side and tinted domes can make it difficult to see the internal structure. Auto insertion didn't work, f
Electronics Forum | Tue Dec 07 20:24:53 EST 1999 | Dave C.
Instead of a Mnemonic, I used association to remember. The crazier the association, the easier it is to remember. And each person can come up with their own associations. Here's some of mine: Black - The room is black when there's no (0) lights o
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