TECHNET Archives

March 2012

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Inge Hernefjord <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Inge Hernefjord <[log in to unmask]>
Date:
Tue, 20 Mar 2012 22:36:49 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (103 lines)
  is a fertile garden for the growth of tin whiskers......what
romantic...technopoetry !
Inge


On 20 March 2012 19:50, Stadem, Richard D. <[log in to unmask]>wrote:

> Tin whiskers can grow in leaded circuits, ie, CCAs soldered with Sn63. The
> issue is that the parts need to be tinned of their lead-free original
> finish, and the ENTIRE LEAD then must be tinned with Sn63. If you leave a
> portion of a SAC305-finished lead untinned, the line of demarcation between
> the Sn63 solder and the SAC305
> C
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
>  Sent: Tuesday, March 20, 2012 12:57 PM
> To: [log in to unmask]
> Subject: Re: [TN] Out of the world tin whiskers
>
> I thought space is exempt for leadfree.  Why?
> --------------------------
> Sent using BlackBerry
>
>
> ----- Original Message -----
> From: Inge Hernefjord [mailto:[log in to unmask]]
> Sent: Tuesday, March 20, 2012 01:47 PM
> To: [log in to unmask] <[log in to unmask]>
> Subject: Re: [TN] Out of the world tin whiskers
>
> DO THEY NEVER LEARN!
>
> Inge
>
> On 20 March 2012 18:08, Gervascio, Thomas L <[log in to unmask]
> >wrote:
>
> > Tin whiskers at Saturn
> >
> > PASADENA, Calif. -- The Cassini plasma spectrometer instrument (CAPS)
> > aboard NASA's Cassini spacecraft at Saturn has resumed operations.
> Mission
> > managers received confirmation on Friday, March 16, that it was turned
> on.
> > They plan to monitor the instrument for any unusual behavior.
> > Last June, short circuits in the instrument led to unexpected voltage
> > shifts on the spacecraft. As a precaution, mission managers turned off
> the
> > CAPS instrument while engineers investigated the issue. The investigation
> > led to the conclusion that tin plating on electronics components had
> grown
> > "whiskers." The whiskers were very small, less than the diameter of a
> human
> > hair, but they were big enough to contact another conducting surface and
> > carry electrical current. Researchers are still trying to understand why
> > whiskers grow on tin and other metals, but they know now that whiskers
> can
> > grow in space and on Earth. It is believed that these or additional tin
> > whiskers that may grow on Cassini cannot carry enough current to cause
> > problems, but will burn out on their own like a lightweight fuse.
> >
> >
> >
> > ______________________________________________________________________
> > This email has been scanned by the Symantec Email Security.cloud service.
> > For more information please contact helpdesk at x2960 or
> [log in to unmask]
> > ______________________________________________________________________
> >
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
> ---------------------------------------------------------------------
> This transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute non-public
> information. Any use of this information by anyone other than the intended
> recipient is prohibited. If you have received this transmission in error,
> please immediately reply to the sender and delete this information from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be unlawful.
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

ATOM RSS1 RSS2