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Cross Reference for a Hewlett Packard 1855-0566?

shrtrnd

Jan 15, 2010
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I can't find an equivalent in any of my cross-references for this component (it's a TO-3 package device). Does anybody happen to know what it is?
 

Harald Kapp

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Hmmmm

Very good find. But I can't find 1855-0566.
Interestingly, when I use the search function looking for 1855-0566 locks onto 1855-0598 which is indeed a VN2222LL. The VN2222LL (datasheet), however, comes in a TO-92 case, not TO3.
 

Harald Kapp

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Why?
1855.0566 has no match. The part numbers in the document you linked are with a hyphen:
upload_2019-8-14_11-21-13.png

And the case size doesn't match anyway.
 

Harald Kapp

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Yes, I found that one, but the op asked not for -0556 but for -0566. Maybe a typo, who knows. We'll have to wait for feedback from @shrtrnd .
 

bushtech

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Ooops sorry Harald, you're correct. I must have dyslexiao_O
 

shrtrnd

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It's actually a 1855-0566, no mistake. The only thing I can figure is maybe it was a proprietary part specifically ordered by HP for this instrument.
HP6944A Series 200 Multiprogrammer.
The manual just lists it as a FET made by, you guessed it, Hewlett Packard.
I'm probably SOL, unless I find me a scrap unit to salvage the part from.

Get this, for anybody interested in trivia on this instrument:
The instrument also has a blown VSK3040T, which is a 30A, center-tapped dual schottky rectifier.
So far, the only company that my company will allow me to buy it from, wants $1800 for one each made by Varo,.
... I'd like to wring the neck of whoever the engineer was that designed the power supplies in this thing.
Thanks everybody for trying to cross this FET for me.
The owner wants it fixed, so my next move is to buy some scrap units and salvage parts out of them.
 
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