TIP125

Introduction

A TIP125 is a medium power NPN darlington-type transistor with high current gain, typically used to amplify and switch electronic signals. It is designed for power switching applications and has approximate Vce(sat) of 1.6 V. It is part of the TIP series of transistors manufactured by Motorola Semiconductor. It is composed of two transistors in a Darlington connection with a common emitter, a common base, and a common collector. This transistor is composed of two PNP transistors connected in series as a Darlington pair, which gives it a much higher current gain than single transistor amplifiers.

Features

• High current gain, typically up to 1000
• Vce(sat) ofjust 1.6 V
• Low input capacitance of only 2.5 pF
• Low collector-to-emitter saturation voltage of 0.9 V
• High power dissipation rate of 600 mW
• NPN darlington-pair for medium-power applications

Applications

The TIP125 transistor is commonly used in switching and amplifier applications. It has a high current gain and low saturation voltage, making it ideal for these applications. It is commonly used to control the speed and direction of electric motors such as brushed DC motors. It is also used in power amplifiers and switching applications such as relays, solenoids and contactors. In addition, it is used in high-power radio frequency (RF) amplifiers and switching circuits. The TIP125 transistor is also suitable for use in circuits that require high power, such as in automotive and industrial applications.

Working Principle

The TIP125 transistor operates by utilizing the Darlington configuration. This is a combination of two bipolar transistors with a common collector and common emitter, connected in a unique way. The base of the first transistor is connected to the collector of the second transistor, and the base of the second transistor is connected to the emitter of the first transistor. This forms a single high-gain amplifier, with the transistors amplifying the current from the base to the collector. The high gain of the Darlington configuration allows the TIP125 to switch between saturation and cutoff near the maximum range.

Conclusion

The TIP125 transistor is a medium-power NPN darlington-type transistor that is used in power switching and amplifier applications. It is composed of two PNP transistors connected in a Darlington pair configuration, giving it a high current gain. The TIP125 is commonly used to control the speed and direction of electric motors, and can be used in high-power radio frequency (RF) amplifiers and switching circuits. It has a Vce(sat) of 1.6 V and low input capacitance of 2.5 pF, making it suitable for various applications.