BC817-25,215

The BC817-25,215 is a versatile NPN bipolar junction transistor (BJT) manufactured by Nexperia, designed for general-purpose switching and amplification applications. Here’s a detailed description of its key features and specifications:

General Characteristics:

• Type: NPN Transistor
• Package: Typically available in a TO-92 package, which is a cylindrical plastic housing with three leads extending from the base.
• Material: Silicon

Electrical Specifications:

• Collector-Emitter Voltage (Vce): The maximum voltage that can be applied between the collector and emitter terminals is 45V, making it suitable for a variety of applications.
• Collector Current (Ic): The maximum continuous collector current is rated at 800mA, allowing it to handle moderate loads effectively.
• Gain (hFE): The DC current gain (hFE) ranges from 100 to 630, depending on the collector current, which indicates its efficiency in amplifying signals.
• Power Dissipation (Ptot): The maximum power dissipation is around 500mW, which is important for thermal management in circuit design.

Thermal Characteristics:

• Junction Temperature (Tj): The maximum junction temperature is 150°C, allowing for operation in a wide range of environmental conditions.
• Thermal Resistance: The thermal resistance from junction to ambient is typically around 200°C/W, which is crucial for understanding how heat will dissipate in a circuit.

Switching Characteristics:

• Transition Frequency (fT): The transition frequency is approximately 100MHz, indicating the frequency range over which the transistor can operate effectively.
• Rise and Fall Times: The rise and fall times are relatively fast, making the BC817 suitable for high-speed switching applications.

Applications:

The BC817-25,215 is commonly used in:

• Signal amplification in audio and radio frequency applications.
• Switching applications in power management circuits.
• Driver stages for relays, LEDs, and other loads.
• General-purpose electronic circuits where moderate current and voltage handling is required.

Pin Configuration:

• Pin 1 (Emitter): The terminal through which current exits the transistor.
• Pin 2 (Base): The terminal that controls the transistor's operation; a small current at this pin allows a larger current to flow from collector to emitter.
• Pin 3 (Collector): The terminal through which current enters the transistor.

Conclusion:

The BC817-25,215 from Nexperia is a reliable and efficient NPN transistor suitable for a wide range of electronic applications. Its robust specifications, including a high voltage rating, moderate current handling, and good gain characteristics, make it a popular choice among engineers and hobbyists alike.