The TIP31 is a NPN power transistor. This transistor is available in three different variants based on the voltage, the variants are TIP31A, TIP31B, TIP31C. it has different voltage ratings from 40V to 100V. So in this article describes the pinout, features and equivalent transistor for replacement. The This transistor is used in audio amplifiers, motor drivers, power regulators circuits and also for general purpose switching circuits.
TIP31 Transistor Pinout
The TIP31 is comes in a TO-220 package. To check the pin configuration , you need to hold the transistor flat side facing you and pins are pointing downward. Then count the pin from left to right and Pin 1 is base , Pin 2 is collector and Pin 3 is emitter. For more clarity i gives the pinout configuration in a table below,
| Pin Number | Pin Name |
|---|---|
| 1 | Base |
| 2 | Collector |
| 3 | Emitter |
| Back Metal side | Collector |
Features and Specifications
- Collector-Emitter Voltage (VCEO)
- TIP31A is 40V
- TIP31B is 60V
- TIP31C is 80V
- TIP31CG is 100V
- Collector Current (IC): 3A continuous
- Peak Collector Current (ICM): 5A
- Base Current (IB): 1A maximum
- Total Power Dissipation (TC = 25°C): 40W
- Junction Temperature Range: -65°C to +150°C
Equivalent Transistor for Replacement
PNP Complementary Pair
TIP32 is the complementary PNP transistor for TIP31.
Where to Use TIP31?
Use TIP31 when you need,
- A medium power NPN transistor
- 2A-3A load switching
- Operation below 100V
- A device suitable for linear or switching applications
Applications
- Medium power audio amplifiers circuit.
- Relay / solenoid drivers.
- LED strip dimmers.
- Small motor control.
- Power supply regulators.
- Battery chargers.
