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.
Key Features
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 -80V, making it safe for high-voltage DIY projects.
Technical Specifications
Feature
Specification
Transistor Type
PNP
Package
TO-126
Collector-Emitter Voltage (VCEO)
-80V
Collector Current (IC)
-1.5A
Power Dissipation (Ptot)
12.5W (with heatsink)
DC Current Gain (hFE)
40 to 250
Operating Temperature
-65°C to +150°C
Ideal Applications
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.
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