The short answer is no. If your suppliers process provides adequate
protection to ensure solderability of the an immersion tin coating. And
adequate process methods to ensure acceptable process results from and
immmersion tin, then they should get acceptable performance from
immersion silver.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack C. Olson
> Sent: Friday, August 02, 2002 2:23 PM
> To: [log in to unmask]
> Subject: [TN] ASSY: Immersion Silver vs. Tin
>
>
> Greetings,
>
> A situation has come up that is beyond my experience.
>
> We sent some Immersion Silver boards to an assembly
> vendor and recieved an email saying:
>
> "We are progressing on your boards. The bad news is
> that the white tin flash used on the pads is awful.
> The solder is reflowing irregularly, if at all.
> We suspect that we'll have to touch every joint on
> every part to make a good connection."
>
> So my question to the group is:
> Is there a difference from an assembly process point of view
> between tin and silver?
>
> I'm hoping the root problem is related to their assumption
> that our silver boards were tin, but I don't know enough
> about it.
>
> Thanks in advance for any clues....
>
> Jack
>
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