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Cross Reference for a Hewlett Packard 1855-0566?

Discussion in 'Datasheets, Manuals and Component Identification' started by shrtrnd, Aug 13, 2019 at 4:34 PM.

  1. shrtrnd

    shrtrnd

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    Jan 15, 2010
    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?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    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.
     
  3. bushtech

    bushtech

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    Sep 13, 2016
    on that hparchive search for 1855.0566
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    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.
     
  5. bushtech

    bushtech

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    Sep 13, 2016
    upload_2019-8-14_11-34-47.png
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

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    1,842
    Nov 17, 2011
    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 .
     
  7. bushtech

    bushtech

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    Sep 13, 2016
    Ooops sorry Harald, you're correct. I must have dyslexiao_O
     
  8. shrtrnd

    shrtrnd

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    Jan 15, 2010
    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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