BD249B Bipolar Transistor

Characteristics of BD249B Transistor

Type: NPN
Collector-Emitter Voltage, max: 80 V
Collector-Base Voltage, max: 90 V
Emitter-Base Voltage, max: 5 V
Collector Current − Continuous, max: 25 A
Collector Dissipation: 125 W
DC Current Gain (h_fe): 25
Transition Frequency, min: 3 MHz
Operating and Storage Junction Temperature Range: -65 to +150 °C
Package: TO-3P

Pinout of BD249B

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

Complementary PNP transistor

The complementary PNP transistor to the BD249B is the BD250B.

Replacement and Equivalent for BD249B transistor

You can replace the BD249B with the 2SD1841, 2SD1841-P, 2SD1841-Q, 2SD1842, 2SD1842-P, 2SD1842-Q or BD249C.

Equivalent

Same transistor is also available in:

TO-220 package, BD244A: 65 watts
TO-3P package, BD245: 80 watts
TO-3P package, BD245C: 80 watts
TO-3P package, BD246B: 80 watts
TO-3P package, BD250: 125 watts

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