Overview
The 2N2907 is a silicon PNP bipolar junction transistor designed for high-speed switching and general-purpose amplification. Because it is a PNP type, it is activated by a low (ground) signal at its base, making it indispensable for high-side switching applications. It is most commonly used as the complement to the 2N2222 NPN transistor, allowing makers to build full H-bridges for motor control or complementary push-pull audio stages.
Key Features
Fast Switching: Optimized for high-speed applications with a very low storage time.
High Current for Small Signal: Capable of handling up to 600mA, which is more than enough for driving relays, high-power LEDs, and small DC motors.
Standard Complement: The “perfect match” for 2N2222 NPN circuits.
Wide Voltage Range: Handles up to 60V, giving you plenty of headroom for 5V, 12V, or even 24V projects.
Technical Specifications ⚙️
| Feature | Specification |
| Transistor Type | PNP |
| Package | TO-92 (Plastic) or TO-18 (Metal Can) |
| Max Collector-Emitter Voltage (V_{CEO}) | 60V |
| Max Collector Current (I_C) | 600mA |
| Max Power Dissipation (P_D) | 625mW |
| DC Current Gain (h_{FE}) | 100 to 300 |
| Transition Frequency (f_T) | 200 MHz |
Common Applications
High-Side Switching: Turning on a load that is connected to the positive power rail.
Signal Inversion: Reversing the logic of a digital signal.
H-Bridge Circuits: Combining with NPN transistors to control DC motor direction.
Low-Power Amplifiers: Pre-amplifying audio or sensor signals.
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