Bob K,

Last Friday I visited Rochester Electronics warehouse here in Newburyport MA - the tour was from 0930 to 1330 - quite a campus they have.  A very interesting company (that I didn't know existed).  They stock and manufacture obsolete semiconductor lines from 60+ manufacturers!  They have an enormous collection of IP from RubyLith Amber to 9 track IBM tapes to CDs.  A huge room full of semiconductor testing instruments such as Teradyne and Schumblerger IC testers.  Many different OS's (like OS2) are supported as many of the test instruments are old (to test very old parts).  Need 80186 CPUs?  They fab them.  8039s?  6800s? 68000s?  ECL 10K and 100K.  Windowed ceramic proms (you can have any package you like, from commercial to industrial to space qual.

I needed a Maxim part that was discontinued; Maxim suggested I check with them.  They had 3000+ of them!  They accept obsolete stock from all the distributors.  The wareghouses look like they are from "Raiders of the Lost Ark" :-)) No counterfit issues.  JEDEC, NASA, DOD all approve of their facilities.  They also can reverse engineer a part if the IP has been lost.

They keep all their unpackaged die in dry cabinets purged continually with N2 from a large tank of LN2 outside the building.

Bob L.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Tuesday, March 05, 2013 1:56 PM
To: [log in to unmask]
Subject: Re: [TN] EXTERNAL: [TN] Requirements for Dry Cabinet

Bob,

What is your use? If it's for moisture sensitive devices, then you want something that will stay below 5% (and have a decent recovery time - J-STD-033 says 1 hr). As to whether this means a 2% cabinet or a 5% cabinet is appropriate, my guess is that both are, but you'll probably want to take a close look at the specs and see what the number really means.

Ben

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Monday, March 04, 2013 6:38 PM
To: [log in to unmask]
Subject: EXTERNAL: [TN] Requirements for Dry Cabinet

Hi,

 

Can anyone make a suggestion for the required level of humidity for a Dry Cabinet. 

 

I have seen 1%, 2% and 5% cabinets. I notice a small sampling of moisture indicators have 5% triggers. Does this infer a 2% cabinet is appropriate?

 

I am sure "It Depends" but what are folks using?

 

Thanks,

Bob K.

 

 



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