BC547 NPN Transistor
₵1.00
The BC547 is a general-purpose NPN transistor used for switching, signal amplification, LED control, relay driving, sensor circuits and Arduino electronics projects. It is ideal for learners, hobbyists, repair technicians and electronic project builders.
100 in stock
The BC547 NPN Transistor is a small-signal bipolar junction transistor commonly used in electronic circuits for switching and amplification. It is one of the most popular transistors for students, technicians, hobbyists and project builders because it is simple to use, affordable and suitable for many low-power electronic applications.
This transistor can be used to switch small loads, amplify weak signals, drive LEDs, interface sensors, control buzzers and operate small relay circuits when properly connected. It is also widely used in Arduino, robotics, timer circuits, alarm systems, audio pre-amplifier circuits and general electronics repair work.
The BC547 comes in a TO-92 through-hole package, making it easy to place on a breadboard, veroboard or PCB. It is suitable for electronics training, STEM practicals, school laboratory experiments and DIY circuit design.
For Arduino and microcontroller projects, the BC547 is useful when a digital pin needs to control a small external load that requires more current than the microcontroller pin can safely supply.
Key Features:
- General-purpose NPN transistor
- Suitable for switching and amplification
- Easy to use in breadboard and PCB projects
- Ideal for Arduino and electronics circuits
- Useful for relay, LED, buzzer and sensor control
- Compact TO-92 package
- Good for learners, hobbyists and repair work
- Affordable component for electronics projects
Technical Specifications:
- Part Number: BC547
- Transistor Type: NPN BJT
- Package Type: TO-92
- Collector-Emitter Voltage: 45V
- Collector Current: 100mA
- Power Dissipation: 500mW
- Transition Frequency: 300MHz
- Mounting Type: Through-hole
- Number of Pins: 3
- Pin Names: Collector, Base and Emitter
Applications:
- Arduino switching circuits
- LED driver circuits
- Relay driver circuits
- Buzzer control circuits
- Signal amplification
- Sensor interface circuits
- Timer circuits
- Alarm circuits
- Audio pre-amplifier circuits
- Robotics projects
- School electronics practicals
- General electronics repair
- Complementary transistor circuits with BC557
Recommended For:
- Arduino learners
- Electronics hobbyists
- STEM facilitators
- Repair technicians
- Engineering students
- DIY circuit builders
- Robotics project builders
Important Note:
The BC547 is designed for low-current applications. For higher-current loads such as motors, solenoids or large relays, use a suitable power transistor, MOSFET or relay driver circuit.
Related products
IRLZ44N Logic Level MOSFET (N-Channel) | Arduino Compatible Transistor
Control high-power loads directly from your Arduino or ESP32. The IRLZ44N is a true logic-level MOSFET, meaning it fully turns on with 3.3 V or 5 V gate signals. Unlike the common IRFZ44N, it does not require a gate driver, making it ideal for simple and efficient microcontroller projects.
-
Type: Logic-Level N-Channel MOSFET
-
Maximum Voltage / Current: 55 V / 47 A
-
Gate (Control) Voltage: 5 V (fully compatible with Arduino and ESP32)
- Best for: PWM LED dimming, DC motor speed control, solenoids, relays, and other high-current loads.
LM358 Dual Op-Amp IC | Low Power Operational Amplifier (DIP-8)
The industry-standard chip for audio and signals. The LM358 contains two independent, high-gain operational amplifiers in a single 8-pin package. Unlike the older 741 Op-Amp, the LM358 is designed to work perfectly with a single power supply (like a battery).
-
Package: DIP-8 (Breadboard Friendly)
-
Supply Voltage: 3V to 32V
-
Best For: Pre-amplifiers, Active Filters, and Line Following Robots (Comparator).
NE555 Timer IC (NE555P, NE555N Precision Timer DIP-8)
The legendary chip for timing and pulses. The NE555 / NE555P / NE555N Timer IC (DIP-8) is a must-have for every electronics hobbyist. It can be used to blink LEDs, create delays, generate sound, or control servo motors. It is simple, robust, and works with 5V to 15V.
-
Type: Precision Timer / Oscillator.
-
Package: DIP-8 (Fits standard breadboards).
-
Voltage: 4.5V - 16V DC.
-
Best For: LED Flashers, PWM Motor Control, and Tone Generation.
PAM8403 5V 2×3W Stereo Class-D Audio Amplifier Module
The PAM8403 5V 2×3W Stereo Amplifier Module is a compact and efficient Class-D audio amplifier capable of driving two 4Ω to 8Ω speakers. Ideal for DIY speakers, MP3 players, Bluetooth audio projects, portable electronics and embedded sound applications.
- 2×3W Stereo Output
- 5V Powered
- Class-D Efficiency
- Compact Design
Best For: Mini speakers, DIY audio, MP3 players and portable projects
SN74HC595N 8-Bit Shift Register IC (DIP-16) | Pin Expander
Turn 3 pins into 8. Running out of pins on your Arduino? The SN74HC595 Shift Register allows you to control 8 separate outputs (like LEDs or LCDs) using only 3 digital pins on your microcontroller. You can even daisy-chain them to control hundreds of outputs!
-
Function: Serial-In, Parallel-Out (SIPO).
-
Channels: 8 Outputs per chip.
-
Voltage: 2V - 6V DC.
-
Best For: LED Chasers, 7-Segment Displays, and LED Cube Projects.
SS12D00G4 Mini 3-Pin SPDT Slide Switch – 2 Position
Compact 3-pin SPDT slide switch for breadboards, PCBs and low-power electronic projects. The SS12D00G4 features two switching positions and standard 2.54mm pin spacing for easy integration into DIY circuits.
Type: SPDT / 1P2T
Positions: 2
Pins: 3
Pin Pitch: 2.54mm
Mounting: Through-hole
Typical Rating: Up to 0.2A at 30V DC
Best For: Arduino projects, PCB circuits, mode selection and low-power switching
Reviews
There are no reviews yet.