BD137 NPN Bipolar Medium Power Transistor 60V 1.5A TO-126 Package

BD137 NPN Bipolar Medium Power Transistor 60V 1.5A TO-126 Package

The BD137 is a medium-power NPN silicon transistor designed for audio amplification, signal switching, and linear driving applications. It operates reliably with a collector-emitter voltage of 60V and a collector current up to 1.5A, offering excellent gain stability, low saturation voltage, and high thermal reliability.

Encased in a TO-126 package, the BD137 provides efficient heat dissipation and is ideal for medium-power circuits where both performance and compact size are essential. It’s commonly used in audio amplifier driver stages, voltage regulators, and motor control circuits. For complementary designs, it pairs perfectly with the BD138 (PNP) and BD139 (NPN) transistors.

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Features:

• Transistor Type: NPN Silicon
• Package Type: TO-126 (enhanced thermal performance)
• Collector-Emitter Voltage (V_CE): 60V
• Collector Current (I_C): 1.5A
• Power Dissipation (P_tot): Up to 12.5W (with proper heat sinking)
• DC Current Gain (hFE): 40–250 (typical range)
• Low Collector Saturation Voltage: Ensures high efficiency in power switching
• High Stability: Consistent performance across wide temperature ranges
• Complementary Devices: BD138 (PNP), BD139 (NPN)
• Reliable & Durable: Suited for both industrial and educational uses

Applications:

• Audio Amplifiers: Ideal for driver and output stages in medium-power amplifiers
• Voltage Regulators: Provides consistent and stable voltage control
• Relay & Motor Drivers: Controls moderate loads like motors and relays efficiently
• Signal Switching Circuits: Used in medium-current electronic switches
• Power Management: Suitable for general-purpose medium power control circuits
• Educational & Prototyping Kits: Common in learning projects and development boards
• Complementary Amplifier Designs: Pairs well with BD138 or BD139 in push-pull stages

bd137-transistor-datasheet