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Key Features:

• NPN-type low-power general-purpose BJT transistor

• Maximum collector current: 100 mA

• Maximum collector-emitter voltage: 45V

• High DC gain (hFE): up to 800

• TO-92 through-hole package – easy for breadboards and PCBs

• Widely used in Arduino, DIY electronics, audio, and control systems

• Complementary to BC557 (PNP)

Product Description (Detailed):

The BC547 NPN transistor is a general-purpose low-current BJT used in a wide variety of switching and amplification applications. When the base is biased with a small current, the transistor allows current flow from collector to emitter, making it ideal for digital switches, logic gates, relay drivers, and audio signal processing.

Its compact TO-92 package and wide collector-emitter voltage range (up to 45V) make it suitable for hobby projects, professional circuit design, and prototyping, especially in Arduino and Raspberry Pi based control systems.

This transistor is a staple in electronics kits and used extensively in educational electronics, sensor signal conditioning, and analog interfacing.

Technical Specifications:

How to Use:

Pin Configuration (TO-92 Package):

(Flat side facing you, pins downward)

• Pin 1: Collector

• Pin 2: Base

• Pin 3: Emitter

Typical Circuit Uses:

• LED control via Arduino GPIO

• Relay driver circuit

• Audio preamplifier stage

• Logic inverter / NOT gate

• Pulse switching / PWM control

Example: Connect emitter to GND, base via resistor to Arduino pin, and collector to LED/resistor/Vcc to create a digital switch.

Applications:

• Arduino & microcontroller digital output control

• Sensor signal amplification

• Audio amplifiers and preamps

• Low-current relay switching

• Analog/digital electronics training kits

• Home automation and robotics projects

Package Includes:

• 1 × BC547 NPN Transistor