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OSP Finish-Lead Free Solder Paste

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#42796

OSP Finish-Lead Free Solder Paste | 19 July, 2006

Friends,

I need some help. We have PWB with OSP finish. Which lead free solder paste would you recommend?

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Rob

#42797

OSP Finish-Lead Free Solder Paste | 19 July, 2006

Depends on a number of things - such as type of oven, type of components, if you are washing the boards or not, etc.

Assuming nothing special, no clean, I would try the following (in that order):

Koki: S3X58-M406L Almit: LFM-48 Indium: 5.1

Cheers,

Rob.

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#42801

OSP Finish-Lead Free Solder Paste | 19 July, 2006

Rob,

Thanks for the info. Yes I would like water soulble paste.

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#42808

OSP Finish-Lead Free Solder Paste | 19 July, 2006

i think the most important thing to consider is the # of reflows. is this a double sided assembly? if so OSP degrades during the first LF reflow. also there are many studies out there that show the wetting on OSP is inferior to some of the other commonly LF finishes.

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Reflow Oven

PCB Soldering Tools