Electronics Forum | Fri Jan 08 02:25:42 EST 2010 | graceytiu07
Happy New Year to All: Has anyone of you encountered a solder short on QFP pin yet there's no evidence of bridging in between gaps? I am using an SnPb solder paste.
Electronics Forum | Fri Jan 08 21:34:44 EST 2010 | isd_jwendell
Not specific to QFP, but I had a run of poorly etched boards. I could see the short using 75X magnification with back lighting, but only some of the time. Nasty little shorts on ~25% of the boards that cost us a boat-load of cash.
Electronics Forum | Fri Jan 08 22:39:22 EST 2010 | graceytiu07
Thanks for the reply. I'll try your suggestion. I tried the SEM EDX to check for traces that might cause the bridging problem but it looks normal. I haven't tried yet the material level analysis of the QFP. Thanks again.
Electronics Forum | Tue Jan 12 02:43:20 EST 2010 | graceytiu07
To cbart, The units are from our testing center. Actually I also suspected that it is a board issue. But i dont think its possible for 2 suppliers of board to have same problem. I am also checking the possibility of problem on QFP. Thanks for the s
Electronics Forum | Tue Oct 05 02:57:41 EDT 2010 | patejl
Reese is right. We use algorithm our AOI but the make it find liftead lead on qfp or such... it took me all day to set program and even then some defects pass so that is why Im asking..
Electronics Forum | Tue Oct 04 05:01:00 EDT 2016 | ok66
Hello! Need help! We have Topaz Xi. Need to place QFP176 (26mm). When optimizing the error E0194 (Component will interfere with other nozzles). Need to turn off one nozzle, don't know how to do it. Сan You help us?
Electronics Forum | Wed Mar 29 22:30:13 EST 2000 | cklau
Hi guys; There are a few points that should be taken in to considerations regarding IPC-SM-782 land pattern and design rules. As a general rule all SMT reflow pattern should be in comply with SM-782 but however for special cases like : * PLCC land
Electronics Forum | Tue Jun 27 11:54:56 EDT 2006 | muse95
I don't understand why you think a BGA would be better than a QFP. Half the process questions I see on this forum seem to deal with BGA's, and the switch to Pbfree processing is a far greater hassle - Pb free QFP's will be compatible with either pro
Electronics Forum | Thu Oct 19 13:38:29 EDT 2006 | SWAG
We use random local fids on our Universal equipment - (they don't create a centerline placement point). On your equip., maybe you could try to shoot/dive-bomb the QFP(s) all by themselves using the 2 "random" local fids as your baseline reference po
Electronics Forum | Fri Dec 11 09:06:57 EST 1998 | Tom
| Has any body tried reflowing QFP's on both sides of a board. | GCollier Yes we do that quite often, we are using QFP132 with 0.5mm pitch in pure reflow process for both sides (no glue). It works well, the only problems we have seen was wiht compon
