2N3906 PNP General Purpose Transistor (10-Pack)

2N3906 PNP General Purpose Transistor — TO-92, 40V / 200mA, 10 Pieces

The 2N3906 is the standard PNP complement to the 2N3904 NPN transistor — sharing the same TO-92 package, EBC pinout, and general-purpose small-signal ratings. Rated at 40V collector-emitter voltage and 200mA collector current, it is used for high-side switching, signal amplification, and level shifting in circuits where a PNP device is required. Together with the 2N3904, they form the most commonly stocked complementary BJT pair in electronics.

10 pieces per pack.

Key Specifications

• Type: PNP 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): −40V
• Emitter-Base Voltage (Vebo): 5V
• Collector Current (Ic): 200mA continuous
• DC Current Gain (hFE): 100–300 (@ Ic=10mA, Vce=−1V)
• Power Dissipation (Pd): 625mW
• Transition Frequency (fT): 250MHz
• Saturation Voltage (Vce(sat)): −0.25V @ Ic=10mA
• Manufacturer: Fairchild / ON Semiconductor
• Quantity: 10 pieces

PNP vs. NPN Operation

PNP transistors operate with reversed polarity compared to NPN. The key differences:

• Current direction: Conventional current flows from Emitter to Collector (opposite to NPN)
• Turn-on condition: Base must be pulled LOW relative to Emitter (Vbe ≈ −0.7V) to turn ON
• High-side switching: PNP is naturally suited for high-side switching — Emitter connects to positive supply, Collector connects to load
• MCU control: GPIO LOW = transistor ON; GPIO HIGH = transistor OFF (inverted logic vs. NPN)

High-Side Switch Wiring (5V Load)

• Emitter (E) → +5V supply
• Collector (C) → Load positive terminal
• Load negative terminal → GND
• Base (B) → Arduino GPIO via 4.7kΩ resistor
• 10kΩ pull-up from Base to Emitter (+5V) — ensures transistor is OFF when GPIO is floating
• GPIO LOW = transistor ON (load powered); GPIO HIGH = transistor OFF

2N3906 vs. 2N3904 vs. PN2907

• 2N3906 (PNP): 40V, 200mA. High-side switching, complementary pair with 2N3904.
• 2N3904 (NPN): 40V, 200mA. Low-side switching. Complementary pair with 2N3906.
• PN2907 (PNP): 40V, 800mA. Higher current PNP for loads up to 800mA.

Typical Applications

• High-side load switching controlled by Arduino/ESP32 GPIO
• Complementary push-pull output stage (paired with 2N3904)
• Signal amplification in audio preamplifier circuits
• Level shifting and logic inversion
• Current mirror circuits
• Oscillator and timer circuits (complementary to NPN)
• LED driver (high-side, up to 200mA)

Package Contents

• 10 × 2N3906 PNP general purpose transistor, TO-92

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