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Switching to 62/36/2

John

#26055

Switching to 62/36/2 | 15 October, 2003

I'm looking at an application that would require 62/36/2 solder paste. We currently run 63/37. I'd like to change across the board to prevent a mix up, but I don't know what concerns/issues that might create. The PCB's we currently run are HASL finish 63/37. I've requested info from the paste vendor also. Any help would be appreciated. Thanks John

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RDR

#26056

Switching to 62/36/2 | 15 October, 2003

It is a direct switch over from what I have experienced. You don't need to change anything. You should expect to see a shinier/brighter joint. We actually consider them totally interchangeable with no worries about running either on any product. Some might have exeption to that.

Russ

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#26058

Switching to 62/36/2 | 15 October, 2003

We agree with Russ

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#26063

Switching to 62/36/2 | 15 October, 2003

You will also find an increase in the costs of the paste

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Gabriele

#26065

Switching to 62/36/2 | 15 October, 2003

Wettability also will increase, so it could generate briges on fine pitch leaded component. Gabe

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RDR

#26066

Switching to 62/36/2 | 15 October, 2003

Gabe, Interesting, I have never encountered that before. Why would you think we have never seen it? I would think that the increase in wetting would help "pull" the solder onto the leads reducing bridging. Am I wrong?

Russ (not a rocket scientist, slightly smarter than a brick)

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DL

#26067

Switching to 62/36/2 | 15 October, 2003

Can also reduce leaching of certain types of components.

Also, dont expect to see a "shiny/bright" joint if running Nitrogen in the relfow unit, you'll see a dull/smokey like joint...if running Air then sure,let SHINE!

my 2Cents DaveK

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#26068

Switching to 62/36/2 | 15 October, 2003

I have only used this on Mov assy's, never on boards. If using no-clean does the joint appearance enhance AOI effectivnes? Anyone tried it? The cost would be worth it.

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Gabriele

#26089

Switching to 62/36/2 | 16 October, 2003

Russ, you are right, I've seen briging on 16 mils pitch on OSP (ref under N2),to avoid it needs more care in paste volume. Easier was by 63/37 (Clean) and N2 (on OSP double sided PBA).

Regards Gabe

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