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BC517 NPN Transistor (Pack of 2)

SKU: X9E4YFI7CT
The BC517 Transistor is a high-gain NPN Darlington bipolar junction transistor (BJT) designed for switching and amplification applications that require very high current gain. Internally, it consists of two NPN transistors connected in a Darlington configuration, allowing it to achieve an exceptionally high DC current gain while requiring only a small base current for operation. The BC517 is widely used...
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Specifications

Specifications:

Part Number: BC517
Transistor Type: NPN Darlington Transistor
Package Type: TO-92
Collector-Emitter Voltage (VCEO): 30V
Collector-Base Voltage (VCBO): 40V
Emitter-Base Voltage (VEBO): 10V
Maximum Collector Current (IC): 500mA
Power Dissipation (PC): 625mW
DC Current Gain (hFE): 30,000 (typical)
Transition Frequency (fT): 200MHz (typical)
Mounting Type: Through-Hole
Operating Temperature Range: −55°C to +150°C

Additional Resources

BC517.PDF

FAQ

1. What is a transistor?

A transistor is a semiconductor device used to amplify electrical signals or act as an electronic switch in circuits. It is one of the fundamental building blocks of modern electronic devices.

2. What are the main types of transistors?

The two most common types of transistors are Bipolar Junction Transistors (BJTs) and Field Effect Transistors (FETs). BJTs are available as NPN and PNP types, while FETs include MOSFETs and JFETs.

3. How does a transistor work as a switch?

A transistor works as a switch by controlling the flow of current between its terminals. A small input signal can turn a larger current on or off, making transistors useful in digital and control circuits.

4. Where are transistors commonly used?

Transistors are widely used in amplifiers, power supplies, microcontrollers, communication devices, computers, motor drivers, and countless other electronic applications.

5. Why are transistors important in electronics?

Transistors enable signal amplification, switching, voltage regulation, and digital logic operations. Their reliability, small size, and low power consumption have made modern electronics possible.

View full product details

The BC517 Transistor is a high-gain NPN Darlington bipolar junction transistor (BJT) designed for switching and amplification applications that require very high current gain. Internally, it consists of two NPN transistors connected in a Darlington configuration, allowing it to achieve an exceptionally high DC current gain while requiring only a small base current for operation. The BC517 is widely used in relay drivers, sensor interfaces, LED control circuits, motor drivers, and microcontroller-based projects.

Packaged in the compact TO-92 package, the BC517 offers easy through-hole mounting and reliable performance in a variety of electronic applications. Its built-in base-emitter resistor simplifies circuit design and improves switching reliability, making it an excellent choice for control and automation circuits where low drive current is available.

Key Features

  • NPN Darlington Bipolar Junction Transistor
  • Extremely high DC current gain (hFE)
  • Built-in base-emitter resistor
  • Collector current capability up to 500mA
  • Collector-Emitter Voltage (VCEO) up to 30V
  • Requires very low base current
  • Suitable for switching and amplification applications
  • Compact TO-92 through-hole package
  • Reliable operation and long service life
  • Ideal for direct interfacing with logic circuits and microcontrollers

Applications

  • Relay driver circuits
  • LED driver applications
  • Small DC motor control
  • Sensor interface circuits
  • Microcontroller and Arduino projects
  • Industrial automation systems
  • Signal amplification circuits
  • Alarm and security systems
  • Consumer electronics
  • Educational and DIY electronics projects