BD139-16 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): 100 to 250
• 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 BD139-16 transistor can have a current gain of 100 to 250. The gain of the BD139 will be in the range from 40 to 250, for the BD139-10 it will be in the range from 63 to 160, for the BD139-6 it will be in the range from 40 to 100.The complementary PNP transistor to the BD139-16 is the BD140-16.The BCP56 (SOT-223), BCP56-16 (SOT-223), BCX56 (SOT-89) and BCX56-16 (SOT-89) is the SMD version of the BD139-16 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD139-16 with the 2SC2481, 2SC3117, 2SC3902, 2SD1684, 2SD1724, 2SD1725, 2SD669, BD139G, BD169, BD179, BD230, BD237, BD237G, BD379, BD379-16, BD789, BD791, KSE182, MJE182, MJE182G, MJE242, MJE244 or MJE722.