BC307 BJT PNP Transistor TO-92

The BC307 is a PNP Bipolar Junction Transistor (BJT) in a compact TO‑92 package, ideal for low‑power signal amplification and high‑side switching in analog and digital circuits. Designed for dependable performance, it supports a wide range of electronics components and modules, and interfaces effectively with  other microcontroller platforms when correctly biased.

🔎 Key Features

• PNP polarity: Enables controlled current flow from emitter to collector for high‑side switching and analog stages.
• TO‑92 package: Through‑hole, breadboard‑friendly form factor for prototyping and production.
• Durable construction: High‑quality materials for stable, long‑term operation.
• Strong gain–bandwidth characteristics: Suitable for a variety of low‑power amplification and switching applications.

🧰 Technical Specifications

• Type: BJT (Bipolar Junction Transistor)
• Polarity: PNP
• Package: TO‑92
• Collector–Emitter Voltage (Vceo): −45 V
• Emitter–Base Voltage (Vebo): −5 V
• Collector Current (Ic): −100 mA
• Total Power Dissipation (Pd): 500 mW

🧪 Typical Applications

The BC307 is a versatile choice for low‑to‑moderate current tasks in analog and digital designs, including:

• Amplification circuits: Boosts weak signals in audio preamps and sensor interfaces.
• Switching circuits: Controls loads as a high‑side switch in low‑power systems.
• Signal modulation: Useful in modulation and biasing stages of communication circuits.
• Power regulation: Assists in reference, bias, and control sections of power supply circuits.

🔗 Integration Tips for Arduino and Raspberry Pi

• High‑side switching: Connect the emitter to the positive supply (V+), the collector to the load, and the load to ground. Pull the base up to V+ (via a resistor) to turn off, and pull it lower than the emitter (via a resistor or driver stage) to turn on.
• Base resistor: Always use a resistor (typically 1 kΩ–10 kΩ) to limit base current and protect the junction.
• Safe operating limits: Observe Vceo = −45 V, Vebo = −5 V (do not exceed the base–emitter reverse voltage), Ic = −100 mA, and Pd = 500 mW. Ensure adequate thermal margin.

📦 Package and Compatibility

• Through‑hole TO‑92 package fits standard breadboards and perfboards for rapid prototyping.
• Ideal for DIY projects, educational labs, and professional designs involving electronics components, BJT transistors, and microcontroller modules.