BC517 BJT NPN Transistor TO-92 ⚡

The BC517 is a high-gain NPN BJT in a compact TO-92 package, ideal for switching and low-to-medium power amplification in a wide range of electronic circuits. Its very high DC current gain makes it a dependable choice for driving loads from microcontrollers like Arduino and Raspberry Pi, as well as for general-purpose electronics components and modules.

⚙️ Key Features

• Very high current gain (hFE) reaching up to 30,000 for sensitive drive applications
• Supports up to 1 A collector current for switching small motors, relays, and LEDs
• TO-92 through-hole package for easy prototyping and installation
• Good frequency response suitable for general switching and amplification
• Power dissipation up to 625 mW with appropriate thermal conditions
• Wide operating temperature range for reliable performance in diverse environments

📐 Technical Specifications

• Type: BJT (Bipolar Junction Transistor)
• Polarity: NPN
• Collector–Emitter Voltage (Vceo): 30 V
• Collector–Base Voltage (Vcbo): 40 V
• Emitter–Base Voltage (Vebo): 10 V
• Collector Current (Ic): 1 A
• Power Dissipation (Pd): 625 mW
• Operating/Storage Junction Temperature: −55 to +150°C
• Package: TO-92 (3-pin, through-hole)

🧩 Notes for Designers

• The BC517’s exceptionally high gain enables direct interfacing with microcontroller GPIO pins (e.g., Arduino, Raspberry Pi) using an appropriate base resistor.
• Provide adequate heat dissipation to stay within the specified 625 mW power limit.
• As with high-gain devices, consider switching speed and ensure proper biasing for your application.

🔧 Potential Applications

Suitable for a broad spectrum of electronics projects and embedded systems:

• Switching circuits (relays, solenoids, indicators)
• Amplification stages and signal processing
• Power regulation and control interfaces
• Audio preamp and driver stages
• Motor control (small DC motors, fans) via external components
• General-purpose modules for Arduino and Raspberry Pi projects

✅ Why Choose the BC517?

• High gain simplifies drive requirements from low-voltage logic
• Compact TO-92 form factor for breadboards and perfboards
• Reliable performance across wide voltage and temperature ranges