PN2222A NPN General Purpose Transistor (10-Pack)

PN2222A NPN General Purpose Transistor — TO-92, 40V / 600mA, 10 Pieces

The PN2222A is a popular NPN general-purpose transistor offering 3× the collector current of the 2N3904 (600mA vs. 200mA) in the same compact TO-92 package. It is the go-to choice when the 2N3904 is not quite powerful enough — for relay coil drivers, small motor control, multiple LED arrays, and any application requiring up to 600mA of switched current from a microcontroller GPIO. The 75V collector-base voltage also provides extra headroom for higher-voltage switching applications.

10 pieces per pack.

Key Specifications

• Type: NPN Bipolar Junction Transistor (BJT), silicon
• Package: TO-92 (through-hole, plastic)
• Pinout (flat face forward, left to right): Emitter (E) — Base (B) — Collector (C)
• Collector-Emitter Voltage (Vceo): 40V
• Collector-Base Voltage (Vcbo): 75V
• Collector Current (Ic): 600mA continuous
• DC Current Gain (hFE): 100–300 (@ Ic=150mA, Vce=1V)
• Power Dissipation (Pd): 625mW
• Saturation Voltage (Vce(sat)): 0.3V @ Ic=150mA
• Manufacturer: Fairchild / ON Semiconductor
• Quantity: 10 pieces

TO-92 Pinout (Flat Face Forward)

• Pin 1 (left): Emitter (E)
• Pin 2 (center): Base (B)
• Pin 3 (right): Collector (C)

Relay Driver Circuit (12V Relay from 5V Arduino)

• Base (B) → Arduino GPIO via 1kΩ resistor
• Collector (C) → Relay coil negative terminal
• Emitter (E) → GND
• Relay coil positive → 12V supply
• 1N4007 flyback diode across relay coil (cathode to 12V, anode to Collector)
• GPIO HIGH = relay ON; GPIO LOW = relay OFF

PN2222A vs. 2N3904 vs. TIP120

• PN2222A: 40V, 600mA. Best for relay drivers, small motors, LED arrays up to 600mA.
• 2N3904: 40V, 200mA. For lighter loads (single LEDs, signal switching) up to 200mA.
• TIP120: 60V, 5A, Darlington. For high-current loads (large motors, fans) up to 5A.

Typical Applications

• 5V/12V relay coil driver from Arduino GPIO
• Small DC motor control (up to 600mA)
• Multiple LED array driver (up to 600mA total)
• Continuity tester circuit (base pulled high by probe contact)
• Buzzer and piezo driver
• Signal amplification and switching
• MOSFET gate driver (NPN transistor driving P-channel gate)
• Logic-level signal inversion and buffering

Package Contents

• 10 × PN2222A NPN general purpose transistor, TO-92

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