TECHNET Archives

November 2005

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:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Fri, 18 Nov 2005 17:04:03 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (196 lines)
They are robust - from shock because of their toughness and low mass,
but I think Gary actually ended up having them physically touch the
insides of the reel pouches, so all bets are off with respect to
robustness I believe.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Friday, November 18, 2005 5:00 PM
To: [log in to unmask]
Subject: Re: [TN] Tin whiskers on 0402's in the reel.

"Sn whiskers are SO robust that it is almost impossible to break them
off
the substrate during deliberately severe vibration/shaking."
May be true.  But if you got a fan blow on it (like in the computer with
90W
processor), you will get them off rather easy...and redeposite to what
ever
the place you do not want it go...That is why so many parts pass the
reliability qual and fail in the field... the qual parts do not use
fan!!!
(may be they do not have fan in europe)..

my 1.68 cents...
                            jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Vladimir Igoshev
Sent: Friday, November 18, 2005 4:09 PM
To: [log in to unmask]
Subject: Re: [TN] Tin whiskers on 0402's in the reel.


Gary, what is the part finish?
It is interesting that you were able to get rid of the problem by
"shaking"
the parts. Recent data showed that Sn whiskers are SO robust that it is
almost impossible to break them off the substrate during deliberately
severe
vibration/shaking.

Regards,

Vladimir

Vladimir Igoshev, Ph. D.
Senior Materials Researcher
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 Gary Camac
Sent: Friday, November 18, 2005 3:57 PM
To: [log in to unmask]
Subject: [TN] Tin whiskers on 0402's in the reel.


Good afternoon,



We have had a problem today with a reel of 0402 resistors where the
placement machine would not pick some of the parts out of the tape
(paper).
A part I examined would not fall out of the pocket when the feeder was
turned upside down.  I examine the part sitting in the pocket and it
appeared to be jammed into one corner.  After some tapping on the feeder
the
part dislodged.  When I examined the part under a microscope, I noticed
a
filament attached to the bottom of the part starting at the corner of
the
electrode.  The following part in the tape would, likewise, not fall out
until persuaded.  This part fell into my hand and when I examined it
under
the scope I could see a filament lying beside it in my palm.



These parts are a 2002 date code.  Tin whisker?  Anyone seen this
before?



I took the reel on components to our environmental test lab, bolted it
to
the sinusoidal vibration table and shook for about a minute.  We then
reinstalled the reel on the placement machine and the picking problem
went
away.  Interesting stuff for a Friday afternoon.



Gary Camac

Senior Mfg. Eng.

Dickey-john Corp.






---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask]
or
847-615-7100 ext.2815
-----------------------------------------------------



---------------------------------------------------------------------
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.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask]
or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------



---------------------------------------------------------------------
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.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2