BC857B PNP Transistor SOT-23 45V 100mA General Purpose SMD

The BC857B is a general-purpose PNP silicon bipolar junction transistor (BJT) designed for low-power switching and signal amplification applications. Packaged in a compact SOT-23 surface-mount package, it serves as the SMD equivalent of the popular BC557 transistor and is widely used in modern electronic circuit designs.

With a collector-emitter voltage (VCEO) of −45V, 100mA collector current, and a DC current gain (hFE) of 220 to 475, the BC857B offers reliable performance for analog and digital switching applications. Its 100MHz transition frequency makes it suitable for high-speed signal processing and low-frequency amplification. Commonly paired with the BC847B NPN transistor in complementary amplifier and switching circuits.

Key Specifications

• Part Number: BC857B
• Transistor Type: PNP
• Package: SOT-23
• Mounting Type: Surface Mount (SMD)
• Collector-Emitter Voltage (VCEO): −45V
• Collector-Base Voltage (VCBO): −50V
• Emitter-Base Voltage (VEBO): −5V
• Maximum Collector Current (IC): −100 mA
• Power Dissipation: 200 mW – 250 mW
• DC Current Gain (hFE): 220 – 475
• Transition Frequency (fT): 100 MHz
• Device Marking: 3F

Package Includes

• 1 x BC857B PNP Transistor SOT-23 45V 100mA General Purpose SMD

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