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Looking for dual FET (I think...)

Discussion in 'Electronic Repair' started by [email protected], May 25, 2007.

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  1. Guest

    Hi all,
    I am looking for a replacement for what I believe is a dual FET. Or
    specs for this device so that I could fine a suitable replacement. The
    part I have is in a small metal can "transistor" type package (I
    forget the package designation, but it is the size of a metal can
    2N2222) but with 6 leads. Base upon the application and the markings
    on the circuit board (G1, S1, G2, S2) I believe this to be a dual FET.
    The only marking on the can is "9610-TM" and "LS". I tried googling
    this p/n but did not find anything helpful. The manufacturer of the
    unit this is in no longer supports it or makes anything like it, and
    has no data on it, as it is 12+ years old.

    Any ideas as to what that part is or where to find one?

    Thanks for any ideas.

    -AL A.
     
  2. N Cook

    N Cook Guest

    Do you mean a dual gate , single FET or 2 FETs in a can - a lot of
    difference.
    What sort of frequencies is it handling?
     
  3. He said "dual fet". It also has six leads and no MOSFET I ever
    saw had six leads. Also, the circuit board has "S1" and "S2" which
    would indeed suggest to source pins.

    Michael
     
  4. R!

    R! Guest

    wrote in @k79g2000hse.googlegroups.com:
    I had a similsr problem with a B&K analog FET meter, I used 2 matched
    audio amp fets to92 plastic case and glued them together with super
    glue.

    Complete recalabration was required after this sub still use the ohm-
    meter part of the old meter yet today it has Hi and Lo power ohms 1.25
    to 1.35 volts across leads on hi and 0.33 volts on Lo. Still find this
    usefull today.

    R!!
     
  5. Al A.

    Al A. Guest

    It is 2 FETs in one package, matched, I'm sure. This is part of a
    preamplifier for a LN2 cooled infrared detector. The detector is
    essentially a reverse biased diode, so the currents involved are
    extremely small, in the range of 10^-8 to 10^-9 amps.

    I have not yet determined with 100% certainty that the FET is dead, I
    will likely know that next week. If it is, I have a few options
    involving what amount to semi-educated guesses, but would rather know
    exactly what to get, if possible.

    Thanks to all for taking the time to reply!

    -AL A.
     
  6. Al A.

    Al A. Guest

    Oops, too quick with the send button. To answer the question of what
    frequency is involved here, they are low, 400-500 Hz, max.

    Thanks again,
    AL A.
     
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