BC817-25

The BC817-25 is a versatile NPN bipolar junction transistor (BJT) manufactured by Infineon Technologies, widely used in various electronic applications due to its reliability and performance characteristics.

Key Features:

1. Type: NPN Transistor
2. Package: Typically available in a TO-92 package, which is a cylindrical plastic housing that allows for easy handling and mounting on printed circuit boards (PCBs).
3. Maximum Collector Current (Ic): The BC817-25 can handle a maximum collector current of 800 mA, making it suitable for driving loads in various applications.
4. Collector-Emitter Voltage (Vce): It has a maximum collector-emitter voltage rating of 45 V, allowing it to operate effectively in circuits with moderate voltage levels.
5. Gain (hFE): The transistor features a current gain (hFE) range of 100 to 600 at a collector current of 10 mA, which indicates its efficiency in amplifying signals.
6. Transition Frequency (fT): The BC817-25 has a transition frequency of approximately 100 MHz, which makes it suitable for high-frequency applications.
7. Thermal Resistance: The device has a thermal resistance rating that allows it to operate safely within specified temperature ranges, ensuring reliability in various environmental conditions.

Applications:

The BC817-25 is commonly used in:

• Switching Applications: It can be used as a switch in low to medium power applications, such as driving relays, motors, and LEDs.
• Amplification: The transistor is suitable for audio and RF amplification circuits, where it can amplify weak signals.
• Signal Processing: It is often employed in signal processing circuits, including oscillators and modulators.
• General Purpose: Its general-purpose nature makes it a popular choice in hobbyist projects and prototyping.

Electrical Characteristics:

• Base-Emitter Voltage (Vbe): Typically around 0.7 V when in the active region.
• Power Dissipation (Pd): The maximum power dissipation is around 500 mW, which is important for thermal management in circuit design.

Conclusion:

The BC817-25 from Infineon Technologies is a reliable and efficient NPN transistor that serves a wide range of applications in electronics. Its robust specifications, including high current handling, voltage rating, and gain, make it a preferred choice for engineers and hobbyists alike. Whether used in switching, amplification, or general-purpose applications, the BC817-25 continues to be a staple component in the electronics industry.