I agree. The time and temperature required to dry the chips in tubes would
be highly dependent on how much air can circulate through the tubes while
drying. If the tubes are airtight, the chips would never dry out.
Dave Roach
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leo Higgins
Sent: Thursday, December 01, 2005 9:05 AM
To: [log in to unmask]
Subject: Re: [TN] moisture bake-out of ICs in tubes
Hello Graham,
What are the package details (type, dimensions, pin count)? I suggest
you use a service company to transfer the parts from the tubes to proper
Jedec trays and then bake them per recommended Jedec procedures. The
relatively low cost for this service should more than offset the risk to
shortcut proper procedures. All bets are off otherwise.
Best regards,
Leo
Leo M. Higgins III, Ph.D.
Vice President Technical Support Operations
ASAT, Inc.
3755 Capital of Texas Highway, Suite 100
Austin, Texas 78704
ph 512-383-4593
fx 512-383-1590
[log in to unmask]
www.asat.com
The information contained in this electronic message is CUSTOMER/SUPPLIER
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Graham Collins
Sent: Thursday, December 01, 2005 8:04 AM
To: [log in to unmask]
Subject: [TN] moisture bake-out of ICs in tubes
Hello Technet!
I've got a pile of ICs received in tubes, that are MSL 3 and have been
exposed to ambient conditions. Thus, the parts need to be baked out.
My question is this: if I want to bake them in the tubes (not take them
out of the tubes), what lowered temperature / longer time can I use?
The quantity means it would be very painful to take them out of the
tubes, and I know the tubes won't withstand 90C / 2 days, but the 40C /
28 days alternative per J-STD-033 (body <= 2mm, per table 4-1) is not
great either. How can I calculate a happy medium between these two
time/temp combinations?
I do know this has come up on Technet before, but I can't find it in
the archive.
Thanks!
regards,
Graham Collins
Process Engineer,
L-3 Communications Electronic Systems Inc.
Halifax
(902) 873-2000 ext 6215
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