Transistor BD138 PNP, 60V, 1.5A, 12.5W, TO-126

Power Transistor BD138 PNP, 1.5A TO-126

Transistors

Reference: TRBD138

Part.No: BD138

€0.80

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The BD138 is a PNP power BJT in a TO-126 package, rated for 60V/1.5A. Commonly used as a driver or output stage transistor in audio amplifiers, power regulators and motor control circuits.

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Description
Product Details

BD138 PNP Power Transistor - Reliable Driver & Output Stage

The BD138 is a PNP power transistor in a TO-126 package, designed for medium-power switching and amplification tasks up to 60V and 1.5A. It is a classic choice for the PNP side of complementary push-pull audio output stages, linear voltage regulators and DC motor driver circuits.

Functions & Applications

60V / 1.5A Rating: Enough headroom for typical audio and power supply applications.
12.5W Power Dissipation: Handles moderate power loads, best with a small heatsink.
TO-126 Package: Tab-mounted package for easy heatsink attachment on PCBs.
Complementary Pairing: Pairs directly with the NPN BD137 for push-pull output stages.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-126
Collector-Emitter Voltage (Vceo)	60V
Max Collector Current (Ic)	1.5A
Power Dissipation (Pd)	12.5W
Mounting Type	Through-Hole (THT), tab for heatsink

Frequently Asked Questions

Q: What is the complementary NPN part for BD138?
A: The complementary NPN transistor is the BD137, commonly used together in push-pull amplifier output stages.

Q: Does the BD138 need a heatsink?
A: For loads approaching its 12.5W dissipation limit, a small heatsink attached to the TO-126 tab is recommended to keep the junction temperature safe.

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: PNP
Transistor Case Style: TO-126

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