BD138 Transistor PNP 60V 1.5A
21,97 EGP
Reliable BD138 PNP Transistor for Audio and Power Drivers
The BD138 Transistor functions as a versatile PNP Silicon Bipolar Junction Transistor (BJT) specifically engineered for medium-power amplification and switching. It is part of a legendary series (including the BD136 and BD140) known for its reliability in audio driver stages and television circuits. Engineers consistently select the BD138 for its balance of high collector current and excellent thermal handling in a compact package.
Balanced 1.5-Ampere Performance and Voltage Margin
Specifically, the BD138 manages a continuous collector current ($I_C$) of up to 1.5A. This capacity allows the device to drive loads such as solenoids, DC motors, and high-power LED arrays with high efficiency. Furthermore, the transistor handles a collector-emitter voltage ($V_{CEO}$) of up to 60V. Consequently, the unit provides a generous safety margin for 12V, 24V, and 36V DC systems, ensuring the component survives transient voltage spikes. Moreover, its low saturation voltage (typically 0.5V at 0.5A) minimizes power dissipation during full conduction. Transitioning to the BD138 ensures that your power management stages remain compact without sacrificing current-driving capability.
Versatile TO-126 Package and Complementary Design
Additionally, the BD138 utilizes the industry-standard TO-126 (SOT-32) package. This design features a central mounting hole, allowing you to attach the transistor directly to a heat sink or a metal chassis. Specifically, when properly heat-sinked, the device can dissipate up to 12.5W of power, far exceeding the 1.25W limit in free air.
Moreover, technicians frequently install the BD138 in high-fidelity audio amplifiers. Specifically, its high transition frequency ($f_T$) of up to 190 MHz ensures a clean response in driver and output stages. Furthermore, the component is the PNP complement to the BD137 NPN transistor. Using these two together allows for the creation of perfectly balanced push-pull amplifier configurations or high-efficiency motor controllers. Additionally, its robust construction ensures a long operational life in both consumer electronics and industrial automation.
Verified Data Sheet (Technical Specifications)
| Feature | Specification |
| Transistor Polarity | PNP |
| Collector-Emitter Voltage ($V_{CEO}$) | -60V |
| Collector-Base Voltage ($V_{CBO}$) | -60V |
| Emitter-Base Voltage ($V_{EBO}$) | -5V |
| Collector Current ($I_C$) | -1.5A |
| Peak Collector Current ($I_{CM}$) | -2.0A to -3.0A |
| Total Power Dissipation ($P_{tot}$) | 1.25W (Free Air) / 12.5W (with Heat Sink) |
| DC Current Gain ($h_{FE}$) | 40 to 250 (Variant Dependent) |
| Transition Frequency ($f_T$) | 190 MHz (Typical) |
| Package Type | TO-126 (SOT-32) |
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