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The BD139 is a NPN complementary low voltage NPN transistor in 3 pin Its package is TO-126. This device is designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits.
| Type | Medium Power NPN transistor |
| Maximum collector power dissipation (Pc) | 12 W |
| Maximum collector-base voltage Vcb | 80 V |
| Maximum emitter-base voltage | 5 V |
| Maximum collector current | 1.5 A |
| Applications | Medium Power and Liner Switching |
| Package | TO-126 |
