Taiwan Semiconductor

BC856B

BC856B Description

The BC856B is a PNP bipolar junction transistor (BJT) manufactured by Taiwan Semiconductor Corporation, designed for high-performance amplification and switching applications. Packaged in a compact SOT-23 surface-mount form factor, it offers a collector-emitter breakdown voltage (Vceo) of 65V and a maximum collector current (Ic) of 100mA, making it suitable for low-power circuits. With a transition frequency (fT) of 100MHz, it ensures efficient high-frequency operation. The device exhibits a low Vce saturation voltage of 650mV (@5mA, 100mA), minimizing power loss in switching applications. Its DC current gain (hFE) ranges from 220 (@2mA, 5V), ensuring stable amplification. Compliant with ROHS3 and REACH standards, it is environmentally friendly and widely used in modern electronics.

BC856B Features

• High Voltage Tolerance: Supports up to 65V Vceo, ideal for medium-voltage applications.
• Low Saturation Voltage: 650mV @ 5mA, 100mA ensures efficient switching with minimal power dissipation.
• High Current Gain: hFE of 220 (@2mA, 5V) provides reliable signal amplification.
• Fast Switching: 100MHz transition frequency enables high-speed operation.
• Compact & Reliable: SOT-23 package with tape-and-reel (TR) packaging for automated assembly.
• Low Leakage Current: 100nA (ICBO) cutoff current enhances power efficiency.
• Compliance: ROHS3, REACH, and EAR99 certified for global use.

BC856B Applications

The BC856B is widely used in:

• Signal Amplification: Audio preamps, sensor interfaces, and low-noise amplifiers due to its high hFE.
• Switching Circuits: Load drivers, relay controllers, and power management systems benefiting from low Vce(sat).
• Portable Electronics: Battery-operated devices where low leakage and compact size are critical.
• Automotive & Industrial Systems: Medium-voltage control circuits requiring reliability under harsh conditions.
• High-Frequency Applications: Oscillators and RF stages leveraging its 100MHz fT.

Conclusion of BC856B

The BC856B stands out as a versatile PNP transistor combining high voltage tolerance, low saturation loss, and fast switching in a miniature SOT-23 package. Its high current gain and low leakage make it ideal for precision analog and digital circuits, while compliance with environmental standards ensures broad applicability. Whether in consumer electronics, automotive systems, or industrial controls, the BC856B delivers reliable performance and efficiency, making it a preferred choice for engineers.