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The BD140 is a silicon PNP epitaxial planar transistor housed in the versatile TO-126 plastic package. It is designed for medium-power applications where reliability and high voltage handling are required. Because it is a PNP transistor, it is frequently used for high-side switching or as the negative-half driver in a Class AB audio amplifier. Its flat-faced design allows for easy mounting to a heatsink, which is essential when pushing the transistor to its limit.
High-Side Specialist: Ideal for switching loads connected to the positive rail of your power supply.
1.5A Continuous Current: Provides enough “juice” to drive solenoids, beefy relays, and medium DC motors.
Matched for Audio: Specifically designed to work in tandem with the BD139 NPN transistor for balanced audio output stages.
Heat Dissipation: The TO-126 package features a mounting hole, allowing you to bolt on a heatsink to prevent thermal runaway.
High Voltage Tolerance: Rated for up to $-80\text{V}$, making it safe for high-voltage DIY projects.
| Feature | Specification |
| Transistor Type | PNP |
| Package | TO-126 |
| Collector-Emitter Voltage ($V_{CEO}$) | $-80\text{V}$ |
| Collector Current ($I_C$) | $-1.5\text{A}$ |
| Power Dissipation ($P_{tot}$) | $12.5\text{W}$ (with heatsink) |
| DC Current Gain ($h_{FE}$) | 40 to 250 |
| Operating Temperature | $-65\text{°C to } +150\text{°C}$ |
Complementary Audio Amps: Used with BD139 for high-quality DIY speaker drivers.
H-Bridge Circuits: Part of the PNP-half of a motor controller for directional control.
Voltage Regulators: Used in linear power supply circuits.
Relay Driving: Switching medium-sized industrial relays.
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