Electronics Forum | Mon Mar 31 11:10:43 EST 2003 | davef
First, most �thermal shock� recipes are not a reliability test. There is no relationship between the failures seem in these tests and in-use application. These tests show you the failures in these tests. That�s it!!! Second, accelerated life test
Electronics Forum | Wed Apr 02 09:25:32 EST 2003 | davef
RDR The most common cause of dewetting is from a fabricator using any form of abrasive (e.g. pumice, abrasive brushes etc.) on copper. With this process, abrasive particles get implanted into the copper (often actually swaging copper over some of th
Electronics Forum | Wed Apr 02 23:02:38 EST 2003 | scottf
I agree with Iman. Verify the integrity of the component for moisture. Most definately place an amount of ownership on your PCB supplier. Request tank analysis results and copies of the lot travelers. Look specifically for any in process rework pro
Electronics Forum | Mon Apr 07 16:42:49 EDT 2003 | jax
You will not see any reduction in quality. Some of the only reasons to hold off on converting to SMD packaging is Cost and availability. The cost normally runs about 30% more and the lead times are about 2 times as long for SMD. For that reason you w
Electronics Forum | Thu Apr 10 10:12:33 EDT 2003 | Claude_Couture
Chrissie, You have my deepest sympathies! But I'm very curious about your business takling a space contract. The quantity of boards that you mentioned hints at a GPS satellite systems, am I correct? In any space quality manufacturing, every step of
Electronics Forum | Wed Apr 16 01:01:24 EDT 2003 | kenBliss
Pete Con Keeping the reels resident on the Agilis feeders is one of the key points of the feeder design. The critical points are to make changing feeders very quick less than 20 seconds per change out. You should have all your feeders on reels sta
Electronics Forum | Mon Apr 21 16:39:50 EDT 2003 | k_h
You might try reducing your solder paste volume. To much solder paste gives the part a pool to float in, nullifying the positive effect of surface tension. I use an aperture on stencil for the heat sink which is 5mils reduced on each side and a 25mil
Electronics Forum | Wed Apr 23 18:03:10 EDT 2003 | jgregory
Hello all, It's been about 5 or 6 years since I've visited this site. I used to contribute quite often. However, 4 moves (and states) in 5 years can be taxing. I have found my way back, though. I am in need of info regarding industrial heat vacuum s
Electronics Forum | Thu Apr 24 23:04:45 EDT 2003 | yukim
I've been struggling with this problem for a while. We have two products: A, which is Ok and B, with tombstone defect (0603 & 0805 capacitor chips). A & B have the same design: pad sizes, separation between pads, components orientation. Both have s
Electronics Forum | Mon Apr 28 18:34:17 EDT 2003 | Brian W.
We typically do not try to pick up and hand placve chip resisstors and capacitors. The risk and cost is too high for components that are a penny or less. We take into consideration that on many of our components, someone will have to test them to v
