Yawza!!!! I'm glad a mild rant gets such responses...
Darrel
Oh, I don't have issue with the process. I just have an issue with the
naming. Sorry, it's been bugging me for awhile.
Franklin
And about dumping white Sn on my wife, she already has a heart of gold. I
wouldn't want to get anything brittle in the mix.
Rich
And what does King Tu of IBM know??? He's a thin film scientist, and we all
know those guys don't come out of their vacuum. Having hosted King before,
I'm guessing he was referring to crystal structure as well since he probably
did tons of materials analysis (as is his group's nature) and he's not
really a solder guy. I still think the term was misused. But, history is
history and I've learned why the product is called the White Tin from a
process point of view. I thought it was a clever market ploy.
Dan
Wiskers are controlled by adding small amounts of impurities to inhibit long
range (multigranular lengths) grain boundary diffusion of tin. They
shouldn't be an issue today now that they are understood.
Carey
-----Original Message-----
From: Darrel Therriault <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, February 10, 2000 1:17 PM
Subject: Re: [TN] White Tin PWB
>Carey,
>
>I'm curious......are you taking issue with the naming of the process or the
>process itself??
>
>If you think IWT is not a good finish process, please elaborate. I am in
>the process of qualifying
>it as a potential replacement for OSP and would like to get all the
>data/opinion I can.
>
>Regards..........DT
>
>
>
>
>At 09:34 AM 2/10/00 -0800, you wrote:
>>Every time I see "White Tin" as a process, I get queezy.
>>
>>For the record, white tin is a metallurgical form of tin. The company
(I'll
>>not name) that is trying to capitalize on using it as a process name has
>>bastardized terminology. Of course, your other choice is gray tin which
is
>>unstable with poor properties and forms at low temperatures. So all of
you
>>are using white tin, whether you know it or not. Otherwise, you'd be out
of
>>business.
>>
>>I'm sorry... I just had to get it off my back.
>>
>>Carey
>>
>>-----Original Message-----
>>From: Jorge A Rodriguez <[log in to unmask]>
>>To: [log in to unmask] <[log in to unmask]>
>>Date: Thursday, February 10, 2000 8:07 AM
>>Subject: [TN] White Tin PWB
>>
>>
>> >We are about to start using immersion tin PWBs (white tin) , the boards
we
>> >currently use are HASL and OSP. Are there any changes with the SMT
process,
>> >component termination finish or reflow process when white tin boards are
>>used. I
>> >know that white tin provides a better pad finish than HASL, similar to
OSP,
>>but
>> >wihout the organic coating. Any comments.
>> >
>> >
>> >Any iformation would be appreciated.
>> >
>> >
>> >Jorge Rodriguez
>> >Process Engineer
>> >Conexant Systems Inc
>> >
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