
Transistor/MOSFET
TIP121 Darlington Transistor
The TIP121 is a high-power NPN Darlington transistor capable of handling up to 5A collector current and 80V collector-emitter voltage. It features high current gain (hFE) and is housed in a standard TO-220 package, making it ideal for driving motors, relays, and lighting circuits.
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Category
Transistor/MOSFET
Quality
100% Genuine
About TIP121 Darlington Transistor
The TIP121 is a monolithic NPN Darlington transistor manufactured by STMicroelectronics, designed for medium-power switching and amplification applications. It consists of two bipolar transistors connected in a Darlington configuration, providing very high current gain (typically 1000 or more), which allows it to be driven directly by low-current microcontroller outputs. This transistor is housed in a TO-220 package, ensuring easy mounting and efficient heat dissipation. Key features include a maximum collector-emitter voltage of 80V, a continuous collector current of 5A, and a power dissipation of 65W. It is widely used in applications such as motor drivers, relay controllers, solenoid actuation, and lighting dimmers. The TIP121 is a complementary pair to the TIP127 (PNP version). Choosing the TIP121 ensures reliable performance, high durability, and compatibility with a wide range of industrial and hobbyist electronics projects available in the Indian market.
Technical Specifications
| Transistor Type | NPN Darlington |
|---|---|
| Collector-Emitter Voltage (VCEO) | 80 V |
| Emitter-Base Voltage (VEBO) | 5 V |
| Collector-Base Voltage (VCBO) | 80 V |
| Continuous Collector Current (Ic) | 5 A |
| Power Dissipation (Pd) | 65 W |
| DC Current Gain (hFE) | 1000 (min) |
| Package / Case | TO-220 |
| Number of Pins | 3 |
| Operating Temperature Range | -55°C to 150°C |
| Mounting Type | Through Hole |
Alternative Components
TIP120
TIP122
TIP127
TIP132









