Description
The BD137 NPN Bipolar Power Transistor is a versatile semiconductor component designed for medium-power switching and amplification applications. It is commonly used in electronic circuits that require reliable current control, signal amplification, and driver-stage performance.
With a maximum collector-emitter voltage of 60V and a maximum collector current of 1.5A, the BD137 is suitable for a range of applications, including audio amplifier stages, relay drivers, motor control circuits, and general-purpose power switching. Its TO-126 package offers a compact design with improved heat-handling capability compared with smaller signal-transistor packages.
Whether you are repairing electronic equipment, building an amplifier, or developing a control circuit, the BD137 transistor is a practical option for medium-power electronics projects.
Key Features
- NPN bipolar power transistor: Suitable for switching and amplification.
- 60V collector-emitter voltage: Designed for circuits operating within its rated voltage limits.
- 1.5A maximum collector current: Suitable for medium-power loads under appropriate operating conditions.
- 12.5W maximum power dissipation: Requires proper thermal management to remain within safe operating limits.
- DC current gain of 40–250: Gain varies depending on operating conditions and the specific device.
- TO-126 package: Compact construction for PCB mounting and suitable heatsink installation.
- Wide application range: Useful for audio amplifiers, driver stages, and electronic switching circuits.
Applications
The BD137 NPN transistor can be used in:
- Audio amplifier driver stages
- Medium-power switching circuits
- Relay and load driver circuits
- DC motor control systems
- Signal amplification
- Electronic control and automation projects
- DIY electronics and circuit repairs
BD137 Transistor Specifications
| Parameter | Specification |
|---|---|
| Transistor Type | NPN Bipolar Power Transistor |
| Collector-Emitter Voltage (VCEO) | 60V |
| Collector-Base Voltage (VCBO) | 60V |
| Emitter-Base Voltage (VEBO) | 5V |
| Maximum Collector Current (IC) | 1.5A |
| Maximum Collector Dissipation | 12.5W |
| DC Current Gain (hFE) | 40–250 |
| Operating and Storage Junction Temperature | -55°C to +150°C |
| Package Type | TO-126 |
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