Better than what? Better than it used to be? Could you clarify, as I am
wondering what you mean by that. Thanks.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Thursday, March 16, 2006 3:29 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Tin Specification
Ramon,
Immersion Tin is MUUUUUCH better in terms of whiskering.
Vladimir
Vladimir Igoshev, Ph. D.
Manager, Metallurgical Lab
Research in Motion
451 Phillip St.
Waterloo, ON, N2L 3X2
Voice: (+1) 519-888-7465, ext. 5283
Fax: (+1) 519-886-0863
E-mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon
Sent: Thursday, March 16, 2006 4:12 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Tin Specification
John:
Just curious, what is the tin plating going to be used
on? Thin Tin plating produces whiskers, which can be a nightmare.
Thicker Tin plating helps as a whisker mitigating factor. These whiskers
have shot down a nuclear power plant and caused space craft failures.
Tin plating can very problematic. Whiskers can grow in days or take
years.
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Thursday, March 16, 2006 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Tin Specification
John: Generally accepted goal is one micron, or 40 microinches,
thickness.
You essentially never have to worry about it being too thick, and
thickness of less than 75% of that value should raise eyebrows...
Rudy Sedlak
RD Chemical Company
John Parsons <[log in to unmask]> wrote: IPC have graciously
provided us (the industry) with specifications for ENIG
(IPC-4552) and Immersion Silver (IPC-4553), is there a similar
specification Immersion Tin (white tin)? If not, is there a generally
accepted specification for material thickness?
John Parsons
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