BC547 NPN General Purpose Transistor (5 Pcs)

The BC547 is a low-power NPN Bipolar Junction Transistor (BJT) designed for general-purpose switching and amplification applications. It is one of the most widely used transistors in electronics and is ideal for Arduino projects, relay drivers, sensor circuits, audio amplifiers, LED switching, signal amplification, and DIY electronics. The BC547 offers low noise, high current gain, and reliable performance in compact electronic circuits.

Features

• Full Name: BC547 NPN General Purpose Transistor
• General-purpose NPN transistor
• High current gain (hFE)
• Low noise operation
• Fast switching performance
• Suitable for switching and amplification
• Compact TO-92 package
• Low power consumption
• Reliable and durable construction
• Easy to use in electronic circuits

Specifications

Pin Configuration

When viewed from the flat side with the leads pointing downward:

Note: Some manufacturers may use a different lead arrangement. Always verify the datasheet of your specific BC547 before use.

Applications / Uses

• Relay driver circuits
• LED switching
• Sensor interface circuits
• Audio preamplifiers
• Signal amplification
• Arduino and ESP32 projects
• Oscillator circuits
• Logic switching
• Educational electronics
• DIY electronics projects

Advantages

• High current gain
• Low noise operation
• Fast switching speed
• Compact TO-92 package
• Low power consumption
• Reliable performance
• Low cost
• Widely available

Size

Package Includes

• 1 × BC547 NPN General Purpose Transistor (TO-92)

Note: The BC547 is intended for low-current applications (up to 100mA collector current). For driving higher-current loads such as motors or high-power relays, use a power transistor like BD139, D882, or a suitable MOSFET. Always use a base resistor when connecting the BC547 to a microcontroller or logic output.