TIP137 PNP Transistor Pinout Datasheet

Introduction

The TIP137 is a PNP Darlington power transistor designed for high-current and high-gain applications. Packaged in the TO-220 case style, it can handle up to 8A of collector current and 100V collector-emitter voltage, making it suitable for a wide range of power amplification and switching applications. With its Darlington pair configuration, the TIP137 integrates two PNP transistors internally, providing an extremely high DC current gain (hFE ≥1000), allowing it to amplify very small base currents into large collector currents efficiently.

This transistor is widely used in audio amplifiers, motor control circuits, LED drivers, power supply regulators, and industrial control systems. Its high gain and robust design make it a popular choice for engineers building high-power amplifier output stages and switching regulators. Being a PNP device, the TIP137 is ideal for high-side switching applications, where it supplies positive voltage to the load when activated.

TIP137 PNP Transistor

For reliable performance, the TIP137 includes an integrated base-emitter resistor, reducing the risk of accidental turn-on from leakage currents. It is often paired with its NPN complementary transistor TIP136, forming push-pull amplifier stages or H-bridge motor drivers. Thanks to its 80W power dissipation capability and thermal efficiency, it is suitable for both consumer electronics and heavy-duty industrial projects.

TIP137 Pinout

TIP137 Pin Configuration

TIP137 Transistor Key Features

• PNP Darlington power transistor with very high current gain.
• Can switch and amplify currents up to 8A continuous.
• Designed for audio, motor drivers, and power control.
• Built-in base-emitter resistor for stability and safe switching.
• Packaged in TO-220 for efficient heat dissipation.
• High-side switching capability for positive load control.

Characteristics of TIP137 PNP Transistor

• Transistor Type: PNP Darlington
• Collector-Emitter Voltage (Vce): 100V
• Collector-Base Voltage (Vcb): 100V
• Emitter-Base Voltage (Veb): 5V
• Continuous Collector Current (Ic): 8A
• Peak Collector Current: 12A
• DC Current Gain (hFE): ≥1000
• Power Dissipation (Ptot): 80W
• Transition Frequency (fT): 4 MHz (typical)
• Operating Temperature Range: -65°C to +150°C
• Package Type: TO-220

More Circuit Layouts

Key Applications of TIP137 PNP Transistor

• Audio power amplifier output stages.
• Relay, solenoid, and motor drivers.
• Switching power supply and regulator circuits.
• High-power LED drivers and lighting systems.
• Push-pull amplifier and H-bridge circuits.
• Industrial automation and control equipment.

NPN Complimentary Transistor

TIP132 is the NPN complementary transistor of TIP137.

Equivalent Transistors of TIP137

• TIP135 (PNP, 60V version)
• TIP136 (PNP, 80V version)
• BDW94 (alternative PNP Darlington transistor)
• MJ2955 (PNP power transistor, non-Darlington alternative)

(Pin configuration of some transistors mentioned above may different from TIP137).

Comparison of TIP135 vs TIP136 vs TIP137

• TIP135 is the lowest-voltage version (60V), making it best suited for low-voltage power amplifier stages, LED drivers, and motor controllers.
• TIP136 offers a medium range (80V), providing a balance between voltage handling and power applications.
• TIP137 is the highest voltage (100V) device in the series, designed for high-power audio amplifiers, industrial drivers, and high-side switching where more voltage margin is needed.
• All three have the same current rating (8A continuous, 12A peak) and high gain (≥1000), so the main difference lies in voltage handling capability which is 60V, 80V & 100V respectively.

Datasheet of TIP137 PNP Transistor

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