Insulating a power MOSFET?

Discussion in 'General Electronics Chat' started by Mike33, Jan 30, 2010.

  1. Mike33

    Thread Starter AAC Fanatic!

    Feb 4, 2005
    349
    25
    Hi,
    I'm using a power MOSFET, 2SK3675, to create a variable B+ supply for my tube amp. I've had the circuit in before, working great, but caused it to fail by 'chopsticking' to find a problem, leading to the MOSFET shorting to chassis. I believe the cause of failure was the insulator I used (Radio Shack......) was too small for the device, which rotated just slightly and made contact.
    Does anyone know of a US supplier that might have either a larger size mica insulator, or even better, 'generic' insulating material that I could use? The voltages involved may be assumed to be in the realm of 400VDC. I've read about a dielectric paper used in some 'vintage' designs, is that stuff good for this purpose?
    Thanks!

    ~Mike
     
  2. S_lannan

    Active Member

    Jun 20, 2007
    247
    2
    I looked for a datasheet and it seems the device is a TO-247 package.
    If you google ' TO-247 insulator' you will see some online electronics shops stock them as well as on ebay.
     
  3. Mike33

    Thread Starter AAC Fanatic!

    Feb 4, 2005
    349
    25
    Thank you, I probably should have done that myself but wasn't sure if there were specific insulators for different case styles! :rolleyes:
     
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