Power Transistor BD239 NPN, 1.5A TO-220

Power Transistor BD239 NPN, 1.5A TO-220

Transistors

Reference: TRBD239

Part.No: BD239

€1.20

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The BD239 is a robust NPN Power Transistor in a TO-220 package, purpose-built for audio amplifiers, linear power supplies and medium-power switching applications. Its complementary design with the BD240 (PNP) enables symmetrical push-pull amplification stages.

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Description
Product Details

BD239 Power Transistor – Ideal for Audio & Linear Power Supplies

The BD239 is a classic NPN power transistor widely used in audio amplification and linear power supply designs. Its TO-220 package provides exceptional thermal management, making it capable of handling sustained currents with minimal external heat-sinking, while its complementary pairing with the BD240 enables highly symmetrical push-pull output stages.

Functions & Applications

Complementary Pair Design: Works flawlessly with BD240 for symmetrical push-pull amplification and minimal distortion.
Robust TO-220 Package: Large copper mounting surface for efficient heat transfer to external heatsink.
Medium-Power Rating: Suitable for audio power stages, servo drivers and linear regulation circuits.
Voltage Variants: Available in A, B, and C versions with different Vceo ratings up to 100V for flexible circuit design.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-220
Collector-Emitter Voltage (Vceo)	80–100V (version-dependent)
Max Collector Current (Ic)	1.5A
Power Dissipation (Pd)	12W (with heatsink)
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the complementary PNP transistor for the BD239?
A: The BD240 is the complementary PNP transistor. Together they form a matched push-pull pair ideal for symmetrical audio amplifier output stages.

Q: What is the difference between BD239A, BD239B, and BD239C?
A: The suffix letters indicate maximum voltage ratings: BD239A (60V), BD239B (80V), and BD239C (100V). Choose the version based on your circuit's supply voltage.

Notes

Requires a heatsink for sustained operation above 500mA. Always use a flyback diode when switching inductive loads. Class C transistors are most common in audio applications.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-220

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