High voltage transistor


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  1. #1
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    Default High voltage transistor

    Hi guys.

    I am looking for a transistor to be used as a switch at 1500 Volts and up to 200KHz freq. with a current of up to 100mA, maybe less.

    Untill now I found only 1200 types.

    Thanks,
    Ioannis

  2. #2
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    Wink

    Hi, Ioannis

    BU 157 ... BU 500 ... MJ 12002 -12004 ...

    a look to keyword "Cascode" could be useful too ...

    Regards

    Alain
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  3. #3
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    Default

    Thanks Alain. It seems really hard to find transistors today. Everybody is producing ICs...

    Ioannis

  4. #4
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    Default Re: High voltage transistor

    MOSFET=
    STW3N150, IXTV03N400S, IXTH6N150, STFV4N150,
    There are a bunch of numbers from IXYS and STMicroelectronics.

    Many of the transistors are not in production now. You can find old stock.

    What are you building?

  5. #5
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    Default Re: High voltage transistor

    Thanks Ron, although the project was canelled. It is been two years now...

    It was a switching controller for high voltage low current load.

    Ioannis

  6. #6
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    Default Re: High voltage transistor

    That does not tell me much.

    High voltage transistors (NPN) are slow!! An 800 Volt transistor is faster than a 1000V part. The 1500 volt parts I used are dog slow.

    My experiance is from switching power supplies, solar/wind, CRT monitors and TV sets. A 1500 volt transistor will not run at 200khz. Maybe not at 100khz. Your AC loss will be huge! Not knowing what you are doing....you may need a 1500 V. diode that may burn 5 watts alone.

    Most high voltage junction transistors were made for CRT monitors. They are not in production! I used a high voltage J-FET that I liked. (Silicon Carbide) I can't get the part number from my head.

    Quote Originally Posted by Ioannis View Post
    It was a switching controller for high voltage low current load.

    Ioannis

  7. #7
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    Default Re: High voltage transistor

    It doesn't matter anymore Ron.

    The project is cancelled over 1 and a half year now.

    I do not know what exactly my customer would do, but asked me to make a 200KHz, 1,5KV switch for as much as 100mA.

    Ioannis

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