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Identify A No-Lead Part

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#35632

Identify A No-Lead Part | 19 July, 2005

I have a QFP 160 used on 9 different products that had high fall out for "Insufficient Solder". Basically, a leg or two would pop free when inspected occasionally. This same part is used on different size products, located at different area of each product. We looked at the boards, the profile, the paste, screen printing parameters etc. and found the only common thing was this same QFP. Looking at the QFP manufacturers web site, we could not get any data sheets on this part. They basically had the IPC/JEDEC J-STD 020C spread sheet showing eutectic assembly versus Pb-free assembly. They do say they went no-lead by 2005, so we figured we should reinvestigate our reflow profile. After raising the liquidous temperature to the Pb-free assembly spec., problem goes away. Now my big problem is I have a quality document that recorded these failures. I submitted that we would adjust for no lead and monitor this part in the future. Most "normal" people would find this satisfying and agree to close this out, but we like to take the New American Approach and make things complicated. By doing so, someone can make others look bad in hopes they look good, climb the wonderful corporate ladder, make billions of dollars and become somebody. It appears one of our non-norms e-mailed the sales guy and when he was told of our findings, danced a jig and said it was no-way his part causing these problems. But this guy apparently stated their parts were still lead plated! I can see they are not, but was wondering if there was a way of really telling?

I�ve tried e-mailing him but now he relies stating he is out of the office till next week.

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#35635

Identify A No-Lead Part | 19 July, 2005

Try: http://www.circuittechctr.com/products/201-5100.shtml I've never tried it, but it looks like it should do the trick.

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#35647

Identify A No-Lead Part | 20 July, 2005

I have tried this product and one from Kester with mixed results. Just follow the directions exactly. If it says rub the leads with the swab for 60 seconds, do it! Good luck!

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#35648

Identify A No-Lead Part | 20 July, 2005

Have someone you know but the sales guy doesn't know you know, ask for the same part with no lead. I would not be suprised if the sales guy sang a different tune then.

Stephen

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#35649

Identify A No-Lead Part | 20 July, 2005

We agree with Steven that there must be a way to finagle the imformation from the supplier.

Baring that, go to the chemistry laboratory at your local university and arrange for a chemical analysis of the component leads.

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#35650

Identify A No-Lead Part | 20 July, 2005

Most of these chemical swabs were developed to assess solder used in water supply piping. So, they are a really broad, gross test. If they tell you there's lead, there's probably lead, otherwise you're just guessing.

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Larry Smith

#35651

Identify A No-Lead Part | 20 July, 2005

XRF (x-ray fluorescence spectroscopy) testing

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