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Genny=2C
I agree with Dorothy=2C refresh the immersion tin surface.
It's no problem to do so=2C simply send it to a PCB shop for
Sn refresh.
Simon
----------------------------------------
> Date: Wed=2C 24 Jun 2009 10:10:19 -0700
> From: [log in to unmask]
> Subject: Re: [TN] Immersion Tin solderability eval
> To: [log in to unmask]
>
> Genny=2C
>
> I have customers that when their immersion tin PCB has sat so many
> months on the shelf no matter how well it is stored it is sent back to
> the PCB maker to be re-tinned/plated. It takes only one pad to ruin your
> day. The smaller the pad the more likely a problem.
>
> Dorothy Lush
> Fine Pitch a Flextronics Company
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker=2C Dewey
> (EHCOE)
> Sent: Wednesday=2C June 24=2C 2009 9:43 AM
> To: [log in to unmask]
> Subject: Re: [TN] Immersion Tin solderability eval
>
> Genny=2C
> You have to go with the flow. Sometimes localized hand soldering will
> give you a false positive. If you want to know whether to use them or
> not=2C sacrifice a few and run them though all the subsequent processes
> (especially thermal excursions) they would be exposed to in order to
> establish an expected level of success. If you have to have an official
> reason=3B test them per IPC J-STD-003 for solderability.
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
> Sent: Wednesday=2C June 24=2C 2009 9:16 AM
> To: [log in to unmask]
> Subject: [TN] Immersion Tin solderability eval
>
> We have some Immersion Tin boards that are several years old. From
> everything I have read here or elsewhere=2C ImmSn is supposed to have a
> short shelf life. 6 mos to a year. No one wants to scrap the boards
> without testing them=2C though.
> How would you verify whether they are still good? We hand-soldered some
> pads and actually had no problems which surprised me=2C considering the
> age of the boards=2C but I don't know if that is a valid test.
>
> Genny
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