BD137 NPN Medium Power Transistor (TO-126, Silicon BJT)

The BD137 is a medium-power NPN silicon bipolar junction transistor designed for signal amplification, switching, and driver applications. Its TO-126 through-hole package supports PCB mounting in electronic control circuits, audio amplifier stages, and general-purpose power control applications. The transistor is suitable for circuits requiring an NPN device to control current or amplify electrical signals within its specified voltage, current, and thermal limits.

Key Features -

• NPN silicon bipolar junction transistor

• Medium-power transistor design

• Suitable for signal amplification and switching

• TO-126 through-hole package

• Three-terminal configuration for circuit integration

• Supports driver and control circuit applications

• Suitable for PCB mounting and electronic assembly

Specifications -

• Product Type: Bipolar Junction Transistor (BJT)

• Part Number: BD137

• Transistor Polarity: NPN

• Semiconductor Material: Silicon

• Package Type: TO-126

• Mounting Type: Through Hole

• Number of Pins: 3

• Collector-Emitter Voltage: Verify the exact rating in the manufacturer's datasheet

• Maximum Collector Current: Verify the exact rating in the manufacturer's datasheet

• DC Current Gain (hFE): Depends on operating conditions and manufacturer specifications

• Power Dissipation: Depends on the manufacturer's rating and thermal conditions

• Pin Configuration: Verify the manufacturer's datasheet before installation

Applications -

• Signal amplification circuits

• Audio amplifier driver stages

• General-purpose switching circuits

• Relay and actuator driver circuits

• Electronic control systems

• Industrial electronic equipment

• Educational electronics and repair projects