BD139-10 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1.5 A
• Collector Dissipation: 12.5 W
• DC Current Gain (h_fe): 63 to 160
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The BD139-10 transistor can have a current gain of 63 to 160. The gain of the BD139 will be in the range from 40 to 250, for the BD139-16 it will be in the range from 100 to 250, for the BD139-6 it will be in the range from 40 to 100.The complementary PNP transistor to the BD139-10 is the BD140-10.The BCP56 (SOT-223), BCP56-10 (SOT-223), BCX56 (SOT-89) and BCX56-10 (SOT-89) is the SMD version of the BD139-10 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD139-10 with the 2SC2481, 2SC3621, 2SD669, 2SD669A, BD139G, BD169, BD179, BD179-10, BD179G, BD230, BD237, BD237G, BD379, BD379-10, BD789, BD791, KSE182, MJE182, MJE182G, MJE240, MJE241, MJE242, MJE243, MJE243G, MJE244 or MJE722.