BD138 PNP Bipolar Medium Power Transistor 60V 1.5A TO-126 Package

BD138 PNP Bipolar Medium Power Transistor 60V 1.5A TO-126 Package

The BD138 is a PNP silicon transistor designed for medium-power amplification and switching applications. With a collector-emitter voltage of 60V and a collector current capacity of up to 1.5A, this transistor provides excellent performance, thermal stability, and low saturation voltage.

Encased in a TO-126 package, the BD138 offers efficient heat dissipation and reliable operation in a wide range of electronic circuits. It’s commonly used in audio amplifier stages, voltage regulators, and motor drivers. When paired with the BD137 (NPN) or BD139 (NPN), it forms an ideal complementary configuration for push-pull amplifier designs and power control circuits.

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Features:

• Transistor Type: PNP Silicon
• Package Type: TO-126 (medium-power package with good thermal conductivity)
• 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 Saturation Voltage (V_CE(sat)): Improves energy efficiency
• Excellent Linearity: Suitable for linear amplifier stages
• Complementary To: BD137 and BD139 (NPN) transistors
• High Reliability: Designed for stable, long-term operation

Applications:

• Audio Amplifiers: Ideal for output and driver stages in medium-power amplifiers
• Voltage Regulators: Provides stable voltage and current regulation
• Relay & Motor Drivers: Controls moderate current loads efficiently
• Signal Amplification: Used in low- and medium-frequency amplifier circuits
• Switching Circuits: For power control and load switching operations
• Push-Pull Amplifier Designs: Works as a complementary PNP transistor with BD137/BD139
• Educational & Prototype Projects: Common choice for electronics learners and experimenters

bd138-transistor-datasheet