onsemi

TIP125

TIP125 Description

The TIP125 from onsemi is a PNP Darlington transistor housed in a TO-220-3 package, designed for high-current switching and amplification applications. With a collector-emitter voltage (Vce) rating of 60V and a maximum collector current (Ic) of 5A, it is well-suited for medium-power circuits. The device operates reliably up to 150°C junction temperature (TJ), ensuring stability in demanding environments. Its low saturation voltage (4V @ 20mA, 5A) and high DC current gain (hFE ≥ 1000 @ 3A, 3V) make it efficient for driving loads with minimal base current.

TIP125 Features

• High Current Handling: Supports up to 5A continuous collector current, ideal for power applications.
• Low Leakage Current: Collector cutoff current as low as 2mA, enhancing energy efficiency.
• Robust Thermal Performance: 2W power dissipation capability with a 150°C maximum junction temperature.
• Darlington Configuration: Provides extremely high gain (hFE ≥ 1000), reducing drive circuit complexity.
• Through-Hole Mounting: TO-220-3 package ensures easy integration and heat dissipation.
• Compliance: EAR99 (ECCN) and REACH Unaffected, suitable for global markets.

TIP125 Applications

The TIP125 excels in high-gain, medium-power switching scenarios, including:

• Motor Drivers: Efficiently controls DC motors in industrial and automotive systems.
• Relay/Solenoid Drivers: Provides reliable switching for inductive loads.
• Power Supplies: Used in linear regulators and pass elements.
• Audio Amplifiers: Delivers clean signal amplification in Darlington pair configurations.
• Automotive Electronics: Suitable for lighting controls and power management due to its rugged design.

Conclusion of TIP125

The TIP125 is a high-performance PNP Darlington transistor offering exceptional current gain, low saturation voltage, and thermal resilience. While marked obsolete, its proven reliability in motor control, power switching, and amplification ensures continued relevance in legacy designs. Engineers favor it for simplified drive requirements and robust through-hole packaging, making it a versatile choice for industrial and automotive applications. For modern alternatives, consult onsemi’s latest Darlington series.