BC847B

The BC847B is a general-purpose NPN bipolar junction transistor (BJT) manufactured by STMicroelectronics. It is designed for a variety of applications, including switching and amplification in electronic circuits. Here’s a detailed description of its key features and specifications:

Physical Characteristics:

• Package Type: The BC847B is typically available in a small SOT-23 package, which is a surface-mount device (SMD) that allows for compact circuit designs. The SOT-23 package has three leads, making it easy to integrate into printed circuit boards (PCBs).
• Dimensions: The SOT-23 package dimensions are approximately 2.9 mm x 1.3 mm x 1.1 mm, making it suitable for space-constrained applications.

Electrical Characteristics:

• Type: NPN transistor, which means it conducts when a positive voltage is applied to the base relative to the emitter.
• Collector-Emitter Voltage (Vce): The maximum collector-emitter voltage is typically rated at 45V, allowing it to handle a wide range of voltage applications.
• Collector Current (Ic): The maximum continuous collector current is around 100 mA, making it suitable for low to moderate power applications.
• Gain (hFE): The DC current gain (hFE) ranges from 100 to 600, depending on the collector current, which indicates its efficiency in amplifying signals.
• Transition Frequency (fT): The transition frequency is typically around 100 MHz, which allows for high-speed switching applications.

Thermal Characteristics:

• Junction Temperature (Tj): The maximum junction temperature is rated at 150°C, providing a good thermal margin for various operating conditions.
• Thermal Resistance: The thermal resistance from junction to ambient is low, which helps in dissipating heat effectively during operation.

Applications:

The BC847B is widely used in various applications, including:

• Signal Amplification: It is commonly used in audio and radio frequency amplification circuits.
• Switching Applications: The transistor can be used in low-power switching applications, such as driving small loads or controlling other components in a circuit.
• Level Shifting: It can be employed in level shifting applications where signal levels need to be converted from one voltage level to another.

Additional Features:

• Low Noise: The BC847B is designed to operate with low noise levels, making it suitable for audio and sensitive signal applications.
• High Reliability: As a product from STMicroelectronics, the BC847B is manufactured under strict quality control standards, ensuring high reliability and performance in various environments.

Conclusion:

The BC847B from STMicroelectronics is a versatile and reliable NPN transistor that is well-suited for a wide range of electronic applications. Its compact size, robust electrical characteristics, and thermal performance make it a popular choice among engineers and designers in the electronics industry.