Does anyone have any recommendations for a small, inexpensive oven to bake
IC's with? We're an ASIC design group and build/rework our own prototype PCB
assemblies in small quantities and have decided that we need to be more
cautious with how we deal with large IC's after they have been removed from
the vacuum sealed bag and prior to reflowing them on PCB's.

After the IC's have been initially removed from the bag, I keep any unused
IC's in a plastic bag with the original bag of dessicant and humidity
indicator which never seems to show any excessive amount of exposure to
moisture. But these parts may not be put down on boards for a couple of
months and a co-worker feels that they may still be absorbing enough
moisture to be a potential candidate for "popcorning" even though the
humidity indicator shows otherwise.

A suggestion was made to just buy a "toaster oven" since we only deal with a
few IC's at a time. Any comments, pro or con, with regards to this? Thanks
in advance for any feedback.

Regards,
Bob Walker
Sandgate Technologies Inc.
[log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Curtis Thompson
Sent: Friday, May 25, 2001 11:08 AM
To: [log in to unmask]
Subject: Re: [TN] Moisture Sensitive Components


A simple sealed oven (at 40C) that is purged with clean nitrogen is very
effective (clean N does not carry H20)at getting rid of moisture and rather
inexpensive.

Curtis Thompson
Extreme Networks Process Development Engineer

-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Thursday, May 24, 2001 12:44 PM
To: [log in to unmask]
Subject: [TN] Moisture Sensitive Components


Anyone out there ever considered dring moisture sensitive devices by
lowering the pressure in a storage vessle?

It is difficult to achieve 40°C and less than 5%RH when ambient RH is 50-60
percent. So, someone called and asked how long he would need to keep the
parts at a pressure equivelent of 80,000 ft above sea level, temperature at
room ambient to dry out parts.

No one here had considered it before. The physics made me feel like I was at
altitude.

Guy Ramsey
Senior Lab Technician / Instructor


E-Mail: [log in to unmask] <mailto:[log in to unmask]>
Ph: (610) 362-1200 x107
Fax: (610) 362-1290

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