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Motorola Transistor SP2247

Discussion in 'Electronic Components' started by Tony, Nov 11, 2004.

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  1. Tony

    Tony Guest

    I would like an equivalent substitute for a Motorola SP2247 which is a
    germanium PNP power AF amp/switch.
    The NTE equivalent, NTE 104 costs about $16. I 'm looking for some much
    cheaper. The transistor is used to power
    an electronic flash unit made in the 70's. Thanks for your time.....TONY
  2. time.....TONY

    First off, germanium transistors are nearly extinct today, so I advise
    buying one of the $16 ones ASAP, while you can still get them.

    And the other point is that the circuit probably requires very low
    saturation voltage at high current. Getting a silicon equivalent might
    be difficult.

    For instance, the NTE104 has a Vebo of 10V, and you can't find a silicon
    power transistor with a Vebo that high - they're typically 5V. And
    unfortunately in this app, that's an important spec.

    One alternative would be Ebay. You can get power transistors for fairly
    cheap there. Whether or not they will meet the specs is another thing.
    Stick with germanium, though.
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