NPN Bipolar Transistors (PN2222) - 10 pack
Pack of 10 PN2222 NPN bipolar transistors for switching medium-power loads such as small motors, solenoids, and IR LEDs.
Pinout
- BASE
Control input from ESP32 GPIO via ~1 kΩ base resistor. 3.3 V logic HIGH saturates the transistor.
Type · GPIOVoltage · 3.3 - COLLECTOR
Connects to the negative terminal of the load (buzzer –). The other load terminal connects to the positive supply rail.
Type · GPIO - EMITTER
Connects to circuit GND.
Type · GroundVoltage · 0
| Pin | Type | Function | Voltage |
|---|---|---|---|
| BASE | GPIO | Control input from ESP32 GPIO via ~1 kΩ base resistor. 3.3 V logic HIGH saturates the transistor. | 3.3 |
| COLLECTOR | GPIO | Connects to the negative terminal of the load (buzzer –). The other load terminal connects to the positive supply rail. | |
| EMITTER | Ground | Connects to circuit GND. | 0 |
Pin details
3 connections- BASE
Control input from ESP32 GPIO via ~1 kΩ base resistor. 3.3 V logic HIGH saturates the transistor.
GPIOVoltage · 3.3 - COLLECTOR
Connects to the negative terminal of the load (buzzer –). The other load terminal connects to the positive supply rail.
GPIO - EMITTER
Connects to circuit GND.
GroundVoltage · 0
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