2SC3991 Bipolar Transistor

Characteristics of 2SC3991 Transistor

  • Type: NPN
  • Collector-Emitter Voltage, max: 500 V
  • Collector-Base Voltage, max: 800 V
  • Emitter-Base Voltage, max: 7 V
  • Collector Current − Continuous, max: 50 A
  • Collector Dissipation: 300 W
  • DC Current Gain (hfe): 15 to 50
  • Transition Frequency, min: 18 MHz
  • Operating and Storage Junction Temperature Range: -55 to +150 °C
  • Package: TO-3P

Pinout of 2SC3991

Here is an image showing the pin diagram of this transistor.

Classification of hFE

The 2SC3991 transistor can have a current gain of 15 to 50. The gain of the 2SC3991-L will be in the range from 15 to 30, for the 2SC3991-M it will be in the range from 20 to 40, for the 2SC3991-N it will be in the range from 30 to 50.


Sometimes the "2S" prefix is not marked on the package - the 2SC3991 might only be marked "C3991".
If you find an error please send an email to mail@el-component.com