STMicroelectronics TIP125 Darlington Transistor, PNP, 60V, 65W, 5A, TO-220

The STMicroelectronics TIP125 is a PNP power Darlington transistor designed for high-current amplification in demanding industrial applications. Manufactured using Planar technology with a 'Base Island' layout and a monolithic Darlington configuration, it delivers exceptional high-gain performance combined with very low collector-emitter saturation voltage. This efficient design minimises power loss and heat generation during operation.

Key Features & Performance

The transistor is characterised by its robust construction, housed in a standard TO-220 case that facilitates easy mounting and effective heat dissipation. Its monolithic Darlington configuration provides a very high DC current gain (hFE), ensuring that a small base current can control a much larger collector current, making it ideal for driver stages in power supplies, motor controls, and audio amplifiers.

Applications

Primarily intended for industrial and power management systems, the TIP125 is perfectly suited for applications requiring efficient switching and linear amplification. Its low saturation voltage is critical for improving efficiency in power conversion circuits, helping to reduce energy waste and thermal stress on the overall system.

Specifications at a Glance

• Transistor Type: PNP Darlington
• Collector-Emitter Voltage (V_CEO): 60V
• Power Dissipation (P_d): 65W
• Continuous Collector Current (I_C): 5A
• DC Current Gain (h_FE): 1000 (typical)
• Mounting Style: Through-Hole
• Package / Case: TO-220
• Pin Count: 3 Pins
• Maximum Operating Temperature: 150°C

Engineers and hobbyists alike value the TIP125 for its reliability, high gain, and power-handling capabilities in circuits such as relay drivers, solenoid drivers, and high-power audio outputs. Its through-hole TO-22