Steve,
if the ceramic module is glass sealed, it should be OK from moisture
sensitivity (only true hermetic seals are metal and glass seal). In the
past, some of the ceramic body parts (for high temperature operation) have
changed to polymeric seal (old days, some of vendor claim to pass the leak
test... end up just the polymer absorbed He... rather than really valid
test... another story)... that polymer sealed device might be moisture
sensitive even with a ceramic substrate body and metallic cap...
Just a guess...you really should go back to the vendor to get the answer...
my 1.64 cents...jk ;-)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
Sent: Monday, July 11, 2005 6:45 PM
To: [log in to unmask]
Subject: Re: [TN] Moisture Sensitive Components (again)...
So typically, is this device moisture sensitive or not?
BTW, the leads are gold plated...
-Steve Gregory-
Aluminum oxide is the principal phase most "Ceramic" packages, excluding
most LTCC packages, IBM's low CTE ceramic, and the Hi-CTE ceramic packages
that are available. Calling the PGA body an alumina ceramic or aluminum
oxide ceramic is perfectly correct. It is understood that such a ceramic is
about 90-92 wt % alumina.
Best regards,
Leo
Leo M. Higgins III, Ph.D.
Director of Applications Engineering
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
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard
Sent: Monday, July 11, 2005 4:21 PM
To: [log in to unmask]
Subject: Re: [TN] Moisture Sensitive Components (again)...
Steve,
Many out there are experiencing the same thing.
But not for components such as aluminum oxide (not really ceramic) like
what I think your picture shows.
They may have lead-free finish on the pins, but that does not make them
a candidate for special handling to prevent moisture-related
expansion......usually. It is possible that there is a chance of damage
within the encapsulant. Really hard to tell without consulting the
vendor.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory
Sent: Monday, July 11, 2005 4:00 PM
To: [log in to unmask]
Subject: [TN] Moisture Sensitive Components (again)...
Hi all ya'll!!
Haven't heard anything from my big mouth in quite a while have ya'?
Well, I just got back from two glorious weeks of vacation in beautiful
(but rainy) North Carolina...that's why I've been so quiet.
Anyways, it's about Moisture Sensitive components. You may recall my
posts from a while back about us trying to get our stockroom people more
in tune with MS components and proper handling, and they've been doing a
great job. They come to me with a lot of questions and I actually like
that. Shows me that they're trying to make sure they get it right.
Well today one them came to me today with some parts that were packaged
and labeled MSL 3, but they were ceramic Pin-Grid-Arrays?!?
You can how they were packaged and labeled at:
http://www.stevezeva.homestead.com click on Picture Page 2 and look at
Ceramic PGA Packaging to see how they came to us.
I've always thought that ceramic parts were not subject to moisture
related concerns, am I wrong once again?
It's a Cypress part, PN # 5962-9759802QXC (Military part). I called
Cypress, to verify if it was a MS component or not, and got their
outsourced technical support line (I think from India), and I was told I
had to "submit a case"
email
to get my question answered.
I think somebody suggested last time when I posted about this, that
distributors are putting MSL labels on everything just to be safe,
whether a component is MS or not....are any of you experiencing this?
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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