The IGBT of my induction cooker recently blown up and I have found it's FGA20S125P which is a 1250V 20A Shorted anode type IGBT. The datasheet is available here. However I couldn't find this IGBT model and overseas orders would take months to reach me at a reasonable cost.

I came across a different IGBT Called IRG4PH50UD which has almost same parameters (close enough I guess) from a local vendor. The datasheet is available here.

However this IGBT is mentioned as an "UltraFast CoPack IGBT" with a weird symbol as shown below. enter image description here

I couldn't find much information what "Copack IGBT" means. It seems to be some kind of small improvement to existing IGBT technology. Could someone explain me what this term means? Would I be possibly able to replace FGA20S125P with this IGBT? The datasheet parameters looks almost similar as far as my knowledge on IGBTs goes. Also please note that I have limited experience using IGBTs as well.

  • 2
    \$\begingroup\$ It's says what copack means right there on the front page in the third bullet point in the feature list. \$\endgroup\$
    – DKNguyen
    Jan 23, 2022 at 5:51
  • \$\begingroup\$ @DKNguyen Thanks, I was confused by the weird symbol and never though it's something simple as that. \$\endgroup\$
    – Anuradha
    Jan 23, 2022 at 8:35
  • \$\begingroup\$ Update: I have replaced FGA20S125P with IRG4PH50UD and my induction cooker came back to life. No magic smoke :) \$\endgroup\$
    – Anuradha
    Jan 26, 2022 at 6:44

1 Answer 1


CoPack means the avalanche diode and IGBT are packaged together and both are rated at 20A continuously. (or 16A/24A in the case of your Infineon example)

You can inspect some datasheets to check for crossovers.


  • \$\begingroup\$ Thanks, I didn't realize it's something simple as that. I guess both igbts should be compatible enough for my purpose then. \$\endgroup\$
    – Anuradha
    Jan 23, 2022 at 8:32

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