Shopping Cart

Product Description (Detailed):

Empower your electronic circuits with the ubiquitous BC547 NPN Transistor, a truly indispensable component for a myriad of general-purpose applications. This robust low-power amplifier and switch is a favorite among hobbyists, students, and professional engineers due to its versatility, reliability, and cost-effectiveness. Housed in the compact and easy-to-use TO-92 package, it's perfect for both prototyping on breadboards and permanent installations on printed circuit boards (PCBs).

The BC547 is an NPN Bipolar Junction Transistor (BJT). This means a small current applied to its base terminal can control a much larger current flowing between its collector and emitter terminals. This fundamental characteristic allows it to operate in two primary modes:

1. As a Switch: When a sufficient current is applied to the base, the BC547 can be driven into saturation, acting like a closed switch that allows current to flow through a connected load (e.g., turning an LED on, activating a relay, or controlling a small DC motor). When the base current is removed, it enters the cutoff region, acting as an open switch, blocking current flow. This makes it ideal for digital control, logic circuits, and power switching applications where microcontrollers need to control higher power devices.

2. As a Low-Power Amplifier: In its active region, the BC547 can amplify weak electrical signals. With a high DC current gain (hFE, typically ranging from 110 to 800), it's perfect for pre-amplification stages in audio circuits (like microphone preamps), sensor signal conditioning, and other analog applications where a small input signal needs to be boosted.

With specifications like a maximum collector current of 100mA and a collector-emitter voltage of 45V, the BC547 transistor offers a balanced performance for a wide range of low-power needs. Whether you're building automated lighting systems, audio projects, simple robots, or learning the fundamentals of transistor operation, the BC547 NPN Transistor is the go-to component for reliable current control and signal amplification.

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.

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)

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