BD139 80V 1.5A TO-126 NPN Transistor
Regular price
Rs.25.00
Sale price
Rs.30.00
BD139 80V 1.25W 1.5A NPN TO-126
The BD139 is an NPN bipolar transistor in a TO-126 package designed for medium-power switching and signal-driving tasks. With an 80 V collector-emitter rating and a continuous collector current of 1.5 A, it supports stable operation in circuits that require controlled power handling. Its low saturation voltage of approximately 0.5 V helps reduce conduction loss, making it suitable for general switching stages and driver circuits.
The device maintains consistent performance across a wide thermal range from −55 °C to +150 °C. Its DC current gain, reaching up to 250 at 150 mA and 2 V, supports use in audio stages, linear circuits, and small power amplifiers. The 1.25 W power-dissipation capability of the TO-126 package allows integration into compact boards with simple heat-spreading requirements.
The BD139 is commonly used in audio drivers, inverter control circuits, relay drivers, and various low- to medium-power control stages in industrial and commercial hardware.
Key Specs
| Parameter | Value |
|---|---|
| Package | TO-126 |
| Type | NPN BJT |
| Collector-Emitter Voltage (VCEO) | 80 V |
| Collector Current (IC) | 1.5 A |
| Power Dissipation (Pd) | 1.25 W |
| DC Current Gain (hFE) | 250 @ 150 mA, 2 V |
| Collector Cutoff Current | 100 nA |
| VCE(sat) | 500 mV |
| Operating Temperature | −55 °C to +150 °C |
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