BC817-40

The BC817-40 is a general-purpose NPN transistor primarily used for amplification and switching purposes in electronic circuits.

Key Features:

• NPN Bipolar Junction Transistor: The BC817-40 is an NPN-type transistor, featuring three semiconductor layers: the emitter (N), base (P), and collector (N).
• Low Power: Designed for low-power applications, suitable for battery-operated devices and energy-efficient circuits.
• High Current Gain (hFE): Offers high current gain, enabling small base currents to control larger collector currents, which is beneficial for amplification purposes.
• Low Saturation Voltage: Provides low saturation voltage, resulting in minimal voltage drop across the transistor when it is fully turned on.
• Fast Switching Speed: Features fast switching characteristics, making it suitable for applications requiring rapid transitions between ON and OFF states.
• Small SOT-23 Package: Available in a compact SOT-23 surface-mount package, facilitating space-efficient integration onto printed circuit boards (PCBs).
• RoHS Compliance: Complies with the Restriction of Hazardous Substances (RoHS) directive, meeting environmental regulations.

Applications: 

• Amplification: Integrated into amplification circuits such as audio amplifiers, voltage amplifiers, and signal amplifiers.
• Switching Circuits: Used in switching applications such as digital logic gates, relay drivers, and motor control circuits.
• Voltage Regulation: Employed in voltage regulator circuits for voltage stabilization and regulation purposes.
• Signal Processing: Integrated into signal processing circuits for filtering, oscillation, and modulation.
• LED Drivers: Used in LED driver circuits for controlling the brightness of light-emitting diodes (LEDs) in various lighting applications.
• Sensor Interfacing: Integrated into circuits for interfacing with sensors such as temperature sensors, light sensors, and proximity sensors.
• Battery Management: Utilized in battery management circuits for charging, discharging, and power switching in portable electronic devices.
• Audio Amplification: Deployed in audio amplifier circuits for amplifying audio signals in audio equipment, speakers, and headphones.