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White residue after cleaning with IPA

Electronics Forum | Sat Jan 25 20:17:40 EST 2003 | ramanandkini

We are soldering a 8 pin TTL chip on to a CEM1 board that has a hot air level soldering. We use no clean soler paste for the reflow process. Now the customer wants us to clean since he is afraid of flux attracting the dust. We have some SMT LEDs that

Plated through via's in pads.

Electronics Forum | Mon Feb 10 21:30:48 EST 2003 | MA/NY DDave

Hi You are probably right. The only thing I will tell you is that one time as thee DFM engineer working between many electronic designers, component manufacturers and CEMs (contract electronic manufacturers) the component manufacturer would not bud

FDA Approval

Electronics Forum | Tue Feb 25 14:11:42 EST 2003 | MA/NY DDave

Hi, Good Notes from others. A few web sites of the piles available. http://www.imdmc.org Indiana Medical Device Mfgs Council http://www.mmda.org Michigan's http://www.raps.org Regulatory Affairs Professional Society The last time I was involve

SMT Component rotation problem

Electronics Forum | Thu Feb 27 14:02:26 EST 2003 | russ

Genny you are right on with the differences between suppliers/packaging etc... I am a CEM and you are correct that we pay no heed to cad rotations from our customers/designers. A.V.L./manufacturers P/Ns information specifies orientations and such.

AOI, Pre or Post Reflow?

Electronics Forum | Wed Mar 12 09:18:10 EST 2003 | MA/NY DDave

Hi Thanks, Going to APEX to see personal demos and hear what they offer and recommend is a great idea. I mean if you want to put AOI everyplace I am sure you will be supported with open arms. What I found interesting in the article was that large

Higher TG for PWB when soldering Lead Free (?)

Electronics Forum | Mon Mar 08 19:52:54 EST 2004 | Ken

I have processed the following materials in lead free processes: CEM FR1 FR4-120 FR4-140 FR4-170 Each material has different responses to thermal stresses. Issues to consider are: Panel size, smt only, wave only, double sided smt...and smt / wave

China Made or American made ( survey)

Electronics Forum | Wed Sep 29 12:10:53 EDT 2004 | Simon Uk

Well for us 'limeys' its more difficult holding on to a job in the OEM/CEM marketplace. There are very limited opportunities for moving to other jobs here, we too like the US are losing a 'hoard' of jobs to China,India and other cheaper climates. Pr

IPC Standard for Acceptable and Reject Criteria

Electronics Forum | Wed Nov 03 09:18:27 EST 2004 | Simon UK

Hi Dennis, It is all dependant on what you state for the class of product i.e. Class 3 is the top end acceptance criteria used mainly in Aerospace and Military. You have 2 terms you need to grasp to avoid confusion. 1. Acceptance Criteria 2. Target

Does anyone know a good component buying company?

Electronics Forum | Sat Mar 11 11:10:05 EST 2006 | eolparts

Hello All, I sent Grant an e-mail and I wanted to share with you. My name is Jim Schreiber and I am the product mgr at EOL Parts Inc. We have access to over 1000+ OEM and CEM excess/surplus inventories that we use on a regular basis to pass on cost

DPMO as a metic to qualify a CEM as World Class

Electronics Forum | Wed Jan 17 17:17:21 EST 2007 | russ

i would say that you are there already. with 10,000 DPM0 you have a 1% fallout, you are at 99.9 basically. 1 out of a 1000 boards will fail? of course one thing we need to know is how many opportunitites do you count for a chip resistor for exam


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