Electronics Forum | Tue Nov 05 09:21:18 EST 2002 | stefwitt
After all, you may want to consider a Flip Chip process. The chips are bumped with tiny solder balls while still on the wafer. You may present the bumped chips in Gel Pack, trays or Surftape to your Pick $ Place machine ( if capable for Flip Chip pl
Electronics Forum | Thu Dec 12 10:42:52 EST 2002 | Adam
Guys Does anyone have any bright ideas with regards to masking a PLCC socket with via holes directly below the socket, prior to conformal coating ? We've tryed kapton tape and peelable masks but not with desirable results. Our coating process is a t
Electronics Forum | Wed Aug 06 10:25:28 EDT 2003 | mleber
Thanks to all who have responded. The boards we are waving are approximately 14X14. SMT bottomside, lots of Dips topside, M39014 caps, and a variety of resistors and diodes. Lead to hole ratio looks good. Board thickness is .090". Picture frame palle
Electronics Forum | Fri Oct 03 08:41:00 EDT 2003 | gregp
JEDEC and IPC for instance do have conventions. But they are only typically for existing part types and do not coincide with one another. I think the bigger problem is the new components and the unusual components that don't seem to fall into any p
Electronics Forum | Tue Oct 14 09:13:14 EDT 2003 | davef
To us, time above liquidous plus 20*C is more important than the 60 sec [er what ever] above 183*C [which we think is meaningless] that the fine solder paste supplier suggest. Based on what you've told us and lacking any failure analysis, we'd gue
Electronics Forum | Tue Nov 18 11:35:43 EST 2003 | John
Does IPC list a specification that describes the acceptable thermal stress capabililty of components? I seem to recall something about dipping at 260C for 10 seconds, but I can't find the reference. Also seem to remember descriptions of the allowab
Electronics Forum | Thu Jan 15 08:39:26 EST 2004 | Patrick
Thanks for the reply, I do know that the HASL finish is "domed " on opposite sides of a QFP site & "smooth" on the other two sides. (ie. Sides 1 & 3 are domed, & sides 2 & 4 are smooth ) depending on the direction the PCB was extracted from sol
Electronics Forum | Tue Jun 29 17:07:35 EDT 2004 | waveroom
What you are looking for is called Plastisol coating. Think of a tv commercial where they dip a pair of plier handles into a coating and they come out looking great and softer and more ergonomic. We offer this on our baskets. The Waveroom Plus 55 Ha
Electronics Forum | Thu Jul 15 22:19:04 EDT 2004 | KEN
Yep, but its hard to contol small parts with the bags. They're good for DIP's and sockets, connectors, but radials are kinda hit and miss. I bought mine from Pentagon EMS. They only use the finest european leather (kidding). PENTAGON EMS 10950 SW
Electronics Forum | Mon Sep 27 20:00:24 EDT 2004 | davef
We agree with Hoss. Dipping is far more controllable and less expensive than spraying for the casual user. An alternative to consider contracting your coating requirements. Amoung the service providers are: * http://www.newenglandcoating.net * htt
