2N3906 PNP General Purpose Transistor
= Low-Power PNP Transistor for Switching and Amplification =
The 2N3906 is a widely used PNP bipolar junction transistor (BJT) designed for generalpurpose lowpower switching and amplification applications . It serves as the complementary PNP counterpart to the popular 2N3904 NPN transistor .
Continuous Collector Current: 200mA
CollectorEmitter Voltage: 40V
Transistor Polarity: PNP. Package: TO92 (throughhole) .
Serves as the complementary PNP pair to the 2N3904 NPN transistor .
Use for high-side switching where it controls the connection between the power source and the load .
= Technical Specifications =
| Parameter | Value |
|---|
| -- | -- |
| Polarity | PNP |
| Collector Current (IC) | 200mA (max) |
| Collector-Emitter Voltage (VCEO) | -40V (max) |
| Emitter-Base Voltage (VEBO) | -5V (max) |
| Power Dissipation (PD) | 625mW (TO-92) |
| DC Current Gain (hFE) | 100-300 |
| Transition Frequency (fT) | 250MHz |
| Package Type | TO-92 |
= Pin Configuration (TO-92, Flat Side Facing) =
| Pin | Name | Description |
|---|
| -- | -- | -- |
| 1 | Emitter | Current flows out through the emitter |
| 2 | Base | Controls the transistor switching |
| 3 | Collector | Current flows into the collector |
Key Features and Applications
Complementary PNP to 2N3904 The NPN counterpart for pushpull amplifier circuits .
HighSpeed Switching Features a 250MHz transition frequency for fast switching applications .
GeneralPurpose Use Ideal for low-power switching loads (LEDs, relays) and signal amplification .
Applications
- High-side switching of small loads .
- Low-power audio preamplifier stages .
- Logic level shifting and inversion circuits .
- General-purpose switching and amplification tasks.
Versatile Component - A standard "jellybean" part widely used in hobbyist and professional electronics .
ThroughHole Package Compatible with breadboards and PCBs.
√ Works with 3.3V and 5V logic systems.
√ Complimentary to 2N3904 for push-pull configurations .
Troubleshooting
Transistor not switching:
- Verify base is pulled low (to ground) relative to emitter to turn on the PNP transistor .
- Check base resistor value (typically 1kΩ to 10kΩ).
- Ensure load current does not exceed 200mA .
Excessive heat:
- Verify load is within 200mA and 40V limits .
- Confirm correct pinout orientation.
