Are you sure it is steel, not zn?
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----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Tue May 13 10:21:57 2008
Subject: Re: [TN] Stainless Steel Contamination Question
Hi John,
The material we're finding is loose and in contact with and
intermittently bridging pins on our ICs.
We apply conformal coating to our products, and of course, when the
compound hardens, it pulls even tighter to the leads and causes a
failure.
I'll verify that the air handling and reflow oven systems have indeed
been checked.
Thanks for your reply!
Leland
-----Original Message-----
From: John Burke [mailto:[log in to unmask]]
Sent: Tuesday, May 13, 2008 10:16 AM
To: 'TechNet E-Mail Forum'; Leland Woodall
Subject: RE: [TN] Stainless Steel Contamination Question
On top...............
How are they connected or are they loose? Have you checked any overhead
air
handling equipment? Looked at the filtering in freflow ststems etc?
JOhn
John Burke
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
Sent: Tuesday, May 13, 2008 6:47 AM
To: [log in to unmask]
Subject: [TN] Stainless Steel Contamination Question
Importance: High
Hi Everyone,
We've had a problem lately with fine strands of stainless steel wire
being found on top of some of our .5 mm pitch ICs. This has caused both
internal and external issues, and we've yet to identify the source.
It's definitely formed wire, with a thickness ranging from 7 to 10
microns, and up to 3 mm in length.
Our automated optical inspection stations can only reliably detect
widths of 12 to 15 microns.
I've checked the internet in an attempt to find common applications of
this wire. I've found two, and they were for ultra-fine filters and
stencil screen mesh. We've investigated (I think) all of our machinery
that would utilize filters this small and have found no such usage.
I've also checked every stencil in our plant, and all of our mesh
material is some type of a plastic compound.
Do you have any idea where this stainless steel might be coming from?
Any suggestions would be sincerely appreciated!
Thanks,
Leland
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