Bipolar (BJT) Transistor NPN 80 V 1.5 A - 1.25 W Through Hole TO-126-3,this is given on description of bd139 model ,i got confused on its power rating which 1.25 W but if we calculate collector to emitter power dissipation must be 120 watt(80*1.5A) .
I have this doubt ,if i am wrong somewhere please correct me
Added 2 weeks, 6 days ago.
Hello there,
Thanks for reaching us. The BD139's Power rating that was provided is the overall power dissipation at room temperature (25°C), which takes into account the Transistor's gain. This amount exceeds the calculated power rating based on collector voltage and current in practical situations.
Please check the link below for more information, and reach back to us if you have any other questions. We'd be happy to help!
Answered 2 weeks, 6 days ago.