is a TIP42G transistor compatible with a 2n6667

Discussion in 'General Electronics Chat' started by dfullersnap, Jun 20, 2011.

  1. dfullersnap

    Thread Starter New Member

    Jun 19, 2011
    9
    0
    Is a TIP42G pnp transistor from radio shack a close enough match with a 2n6667 Darlington PNP to use the TIP42G instead.

    Thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Without the schematic we can not tell if you can use it.
    The posibity to use it depends on the application.

    Bertus
     
  3. dfullersnap

    Thread Starter New Member

    Jun 19, 2011
    9
    0
    Here is the schematic. I realize it is hard to read. Q8 is a 2n6667, is the tip42g compatible.

    thanks
     
  4. #12

    Expert

    Nov 30, 2010
    16,278
    6,791
    TIP42A seems to match the 60V spec. The G only means "lead free". (Something is wrong so far.)

    Adding datasheets now for the convenience of everyone.
    ps, that schematic is SOOO hard to read!
     
  5. ifixit

    Distinguished Member

    Nov 20, 2008
    638
    108
    Hi dfullersnap,

    The MJD44E2 in the schematic is a darlington transistor, 80V, 10A, 20W, which a good match with the 2N6667, but not the TIP42, which is a 6A, non-darlington device. The much higher Hfe (gain) of the darlington device might needed by the circuit.

    Does radio shack have any darlington PNP transistors, 80V, 10A, 20W?

    BTW, the schematic appears to be confidential to Hobart. In the future, post only a snippet of the schematic so that it is useful for the purpose, but not identifiable for any peticular product, or application that is proprietary in nature.

    Regards,
    Ifixit
     
  6. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    According to my cross-reference book;
    2N6667 = Si-P-Darl+di 60v 8A 65W B>1000

    be careful you need a part with an internal diode;
    listed replacements are; BD646 BD898 BDW74A BDX54A
     
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