Low-alpha spheres are available, but they're expensive.
Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069
[TN] Fw: EXT :Re: [TN] Fw: Help. Is this true-- SOFT ERRORS FROM
SOLDER??
harvey
to:
TechNet
03/06/2012 02:17 PM
Sent by:
TechNet <[log in to unmask]>
Please respond to TechNet E-Mail Forum, harvey
So, eutectic solder can be radioactive and SAC alloys can whisker.
What a choice!
----- Forwarded Message ----
From: "Gandhi, Mahendra S (AS)" <[log in to unmask]>
To: harvey <[log in to unmask]>
Sent: Tue, March 6, 2012 10:52:31 AM
Subject: RE: EXT :Re: [TN] Fw: Help. Is this true-- SOFT ERRORS FROM
SOLDER??
I use only SN63..
Mahendra
From:harvey [mailto:[log in to unmask]]
Sent: Tuesday, March 06, 2012 10:50 AM
To: TechNet E-Mail Forum; Karen Tellefsen
Cc: Gandhi, Mahendra S (AS)
Subject: EXT :Re: [TN] Fw: Help. Is this true-- SOFT ERRORS FROM SOLDER??
Karen
I think that Mahendra cannot use SAC solder in space, because of those tin
whiskers.
________________________________
From:Karen Tellefsen <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, March 6, 2012 10:32:39 AM
Subject: Re: [TN] Fw: Help. Is this true-- SOFT ERRORS FROM SOLDER??
This is much more of a problem with tin-lead solder than SAC solder,
because naturally occurring lead emits a tiny amount of alpha particles.
It's mostly an issue with BGA spheres,some of which are high lead alloys,
and are often close to IC chips where the alpha emissions are most likely
to cause damage.,
Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069
[TN] Fw: Help. Is this true-- SOFT ERRORS FROM SOLDER??
harvey
to:
TechNet
03/06/2012 11:58 AM
Sent by:
TechNet <[log in to unmask]>
Please respond to TechNet E-Mail Forum, harvey
Could this be true only of 63-37 or would lead-free SAC alloys also be
potentially guilty of causing soft errors?
----- Forwarded Message ----
From: "Gandhi, Mahendra S (AS)" <[log in to unmask]>
To: "[log in to unmask]" <[log in to unmask]>;
"[log in to unmask]" <[log in to unmask]>;
"[log in to unmask]" <[log in to unmask]>
Sent: Tue, March 6, 2012 8:38:40 AM
Subject: Help. Is this true??
Evidently regular solder has decaying Uranium in it, or somehow generates
alpha
particles, which are being blamed for upsets. Some chips are moving to a
special “low alpha” solder internally to avoid this problem on
bump-grid-arrays
in flipchip parts.
Mahendra Gandhi
SME - PWB Technologies
Aerospace Engineering
One Space Park, M5/1085A
Redondo Beach, Ca. 90278/*[log in to unmask]
(Office: 310.813.6857 Fax: 310.812.8630
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