Electronics Forum | Wed Dec 06 21:28:12 EST 2006 | davef
It's worse than just using the test equipment manufacturer guidelines. Along with that, you have to deal with each of the test fixture fabricators' preferences as well. What this boils down to is a negotiation with the test engineering group as to w
Electronics Forum | Thu Jan 04 20:31:21 EST 2007 | Ben_T
Have you thought about an AOI system? With the system we have where I work, I'm able to run queries that'll tell me DPMO, yield, and pass/fail rates on a board level, part level, and opportunity level. Furthermore, this data can be broken down to see
Electronics Forum | Mon Feb 12 13:16:35 EST 2007 | CK the Flip Guy
Looks good at first glance. Couple of questions, though: Time Above _____. Fill in the blank. Is Liquidous 183C (Tin-Lead) or 217C to 220C (Lead Free)? The "soak" of 150-190, at 0.6*C per second ramp up looks good, weather it's lead or lead-free
Electronics Forum | Fri Feb 16 06:47:38 EST 2007 | CL
vshan, We were using pallets (delmat with cavities for the flex) We put stips of double sided Kapton tape in the critical areas. The tape held up to the heat and kept the circuit flat for the QFP's and BGA's. We based our assembly process for this c
Electronics Forum | Mon Feb 19 17:34:02 EST 2007 | GS
Thank You Pavel and Dave, Unfortunately I do not have IPC-4554. Anyway I 0.6-1.0umm is what I remember, and confirmed by reading also through leterature available on google. I was just going to understand if it possible to obtain more thickness
Electronics Forum | Thu Feb 22 16:40:23 EST 2007 | mika
One of our customers that always was going for Ni/Au surface finish on RoHS PCB and our processs was adjusted for that, "whithout any problem". Recently they decided to switch to another surface finsh: PbFree HASL. What is that? Imersion tin/silver?
Electronics Forum | Wed Feb 28 16:46:08 EST 2007 | jmelson
Philips is out of this business. They spun off the SMT business as Assembleon America. Their site is partially closed, and I don't know what hoops you have to jump through to become a member. The open part of their site gives no result when you se
Electronics Forum | Wed Apr 04 19:27:07 EDT 2007 | davef
The easiest, long term cheapest, and most accurate way to measure top-side temperature is to use one like: * http://www.amazon.com/Fluke-62-Mini-Infrared-Thermometer/dp/B000MX5Y9C/ref=pd_sbs_auto_2/102-7460227-1828165 * http://www.amazon.com/gp/prod
Electronics Forum | Fri Apr 06 10:43:57 EDT 2007 | flipit
Hi, Anyone seeing difficulty is soldering MLFs or QFN with lead free solder? I have an MLF with 3 rows of pads on each of the 4 sides of the part and then the large center ground plane in the middle. The part is 20 mil pitch. Had good luck with l
Electronics Forum | Mon Apr 09 14:53:19 EDT 2007 | flipit
Hi, We were running with few defects with lead solder paste. The lead solder paste with stencil 0.010" X 0.020" and 0.004" thick stencil produced near defect free PCB assys. 0.010" X 0.020" (0.004" thick) lead = defect free 0.010" X 0.020" (0.005"
