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coilcraft i ROHS inductors soldering problem

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#55880

coilcraft i ROHS inductors soldering problem | 7 August, 2008

We are facing low quality due to soldering opens with coilcraft inductors 0402CS-2N7XGLW. The termination used is(suffix L =RoHS compliant silver-palladium-platinum-glass frit.

Did anyone had this problem in the past? Can we do better using T = RoHS tin-silver-copper (95.5/4/0.5)

Please your help.

Thanks,

Eyal Green Quality Manager PCB Technologies,

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Pete B

#55884

coilcraft i ROHS inductors soldering problem | 7 August, 2008

We have experienced the same problem with Pd/AG and P/Ag terminations on precision resistive parts. The problem is dissolution of the termination metallisation into the bulk solder. This is exacerbated by the higher thermal profiles required for RoHS compliant soldering. I am assuming that you are using RoHS solder for your assembly?

I understand that the Pd/Ag and Pt/Ag finishes are designed to be used with conductive adhesive bonding.

We changed to a pure Tin finish native and saw no further issues. If you change to the SAC finish offered by your component supplier this will cure your problem.

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#55900

coilcraft i ROHS inductors soldering problem | 8 August, 2008

We've seen the exact same problem. The solder joints had negative wetting angles and x-sections show that the PdAg termination dissolved into the solder. We no longer allow PdAg terminations.

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#55922

coilcraft i ROHS inductors soldering problem | 10 August, 2008

Thanks Pete yes we usu ROHS solder paste in our process. I agree that this termination is more suitable for adhsive bonding rather than soldering. We'll try changing the termination type as you recommended.

Eyal G

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#55923

coilcraft i ROHS inductors soldering problem | 10 August, 2008

Thanks for your promt reply It was very usefull Eyal

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