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Discussion in 'Electronic Components' started by Ken, Jul 14, 2003.

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  1. Ken

    Ken Guest

    I want to know more about Motorola MFC4060A
    It's a small Positive Voltage Regulator 8-35 V 0.2 A
    And it's over 30 years old.
    I want to know the maximum input voltage it can handle.
    My old tuner use this and the input voltage is 42.5 V
    and I suspect it to be a little high. Output is 20 V.
    I don't want it to break down.
  2. MFC4060

    Input 8-35 volts.

    | __O Thomas C. Sefranek
    |_-\<,_ Amateur Radio Operator: WA1RHP
    (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz
  3. Those old Motorola MFC parts were 'functional circuits', usually in
    some weird package like a four legged package with the legs staggered.
    They're next to impossible to find today. You might consider putting
    a zener in series with the input to drop the voltage down to a decent
    level. Maybe a 9V 1W zener would do it.

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  4. Ken

    Ken Guest

    Thank you and Thomas C. Sefranek.
    Now I have to lower the voltage on the input
    under 35 volt, and thats no problem for me to do.
    I don't want it to break down, but it have been worked
    without any problems in över 30 years now.

    + Ken + (Sweden)

  5. Max input voltage MFC4060A is 38V
    (Ref. D.A.T.A Linear 1976)

    Motorola Databook for MFC4060 (no A) also says 38V.

  6. Ken

    Ken Guest

    Thank you for that information.
    Do you know the minimum dropout voltage it can handle?
    I'm now down at 35V input and want to know how low I can go.
    Output I use is exaktly 20V and I want to know if it can
    handle an input voltage down to 29V with this 20V output?
    I'm planning on reconstruct the PSU to use the FM-tuner
    on DC supply instead (now 230V AC), and if I do so
    the MFC4060A get about 30V DC input (29-31V).
  7. Ken

    Ken Guest

    I planning to use a standard DC/DC converter with input 9-36V
    and output +-15V (30V and 15V) to feed my tuner in the future
    on my battery system 12V now and probably 24V in the future.
    Some of this DC/DC converters is interest me.
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