A136 TIP122 NPN Darlington Transistor, 100V 5A, TO-220 Package, High-Gain Power Switch & Driver

The TIP122 is an NPN Darlington configuration transistor designed for general-purpose amplifier and low-speed switching applications. Because it is a Darlington pair (two transistors in one), it offers an extremely high current gain, allowing it to switch heavy loads like motors and solenoids using only a tiny amount of input current from an Arduino, Raspberry Pi, or other logic circuits.

Key Technical Specifications

• Transistor Type: NPN Darlington

• Collector-Emitter Voltage ($V_{CEO}$): 100V (Maximum)

• Collector Current ($I_C$): 5A (Continuous) / 8A (Peak)

• Current Gain ($h_{FE}$): 1000 (Minimum at $I_C = 3\text{A}$)

• Package Type: TO-220 (Through-hole)

• Features: Integrated anti-parallel collector-emitter diode for inductive load protection.

Applications

• Motor Control: Driving DC motors and stepper motors.

• Relay & Solenoid Drivers: Ideal for triggering high-power mechanical components.

• Lighting: Controlling high-power LED strips or incandescent bulbs.

• Audio Amplifiers: Used in the output stages of medium-power audio equipment.

Why Choose the TIP122?

• Ultra-High Gain: Requires very little base current to fully turn on, making it perfect for direct interfacing with logic-level signals.

• High Voltage & Current: Its 100V/5A rating covers a vast majority of DIY and industrial project needs.

• Built-in Protection: Includes an internal diode to protect against "flyback" voltage spikes from motors or relays, saving you from needing an extra external component in some designs.

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