NPN 2n2222 vs. metal can version max temp?

Discussion in 'General Electronics Chat' started by JayK026, Feb 28, 2012.

  1. JayK026

    Thread Starter New Member

    Feb 26, 2012
    12
    0
    Are these two versions interchangeable? Max operating temp for each?
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    I recall the thermal on the small 2N2222 transistors is about 180C/W ballpark whether the small metal or plastic. The metal ones were required for mil spec because they were hermetically sealed, not because of thermal superiority.
     
  3. JayK026

    Thread Starter New Member

    Feb 26, 2012
    12
    0
    the circuit I'm using it on is only on for a few minutes at a time. I've had temp readouts of 95F+. 180c is really hot, so my transistor should be ok then?
     
  4. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    If the otside temp of the transistor is 95F, it should be no problem.
     
    JayK026 likes this.
  5. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,388
    1,605
    The metal can version is rated for a bit more power, 1.8 W vs 1.5 W at 25°C case.
    The plastic version has the better thermal impedance, 200 vs 300 °C/W

    A 95°F (35°C) case is fine, nothing to worry about there.
     
    JayK026 likes this.
  6. JayK026

    Thread Starter New Member

    Feb 26, 2012
    12
    0
    Thanks bountyhunter, ErnieM. Looked all over the internet and found very little in regards to temp differences.
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
     
  8. Lundwall_Paul

    Member

    Oct 18, 2011
    220
    19
    Microsemi makes a mil version
    MIL-PRF-19500/255
    There part number JANTX2N2222AUB (Other packages avaliable) Operating range -65c to +200c


     
  9. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,388
    1,605
    JayK026: My first stop for data sheets is the Digi Key website. I use it so often I even keep their toolbar in my browser. If you search a part number you may get numerous hits, several manufacturers and the like.

    If you drill down to a specific part they link to the data sheet. Digi key keeps graphics to a minimum so the searches are damn fast.

    That's how I found a 2N2222A data sheet for both package versions very fast.
     
  10. JayK026

    Thread Starter New Member

    Feb 26, 2012
    12
    0
    Thanks, that will be very useful.
     
  11. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    The MIL sheet says the thermal resistance of the little metal can package is 210C/W and maximum power dissipation is 0.5W at 25C ambient. Those numbers are about right for that package.
     
Loading...