BC857B RFG

Overview

The BC857B RFG is a PNP bipolar junction transistor manufactured by Taiwan Semiconductor Corporation. It features a maximum collector current of -100 mA and a collector-emitter voltage (VCEO) of 45 V. The device operates within a temperature range of -55°C to +150°C. Key electrical parameters include a transition frequency (fT) of 100 MHz, an output capacitance of 4.5 pF, and a junction-to-ambient thermal resistance of 625°C/W. Power dissipation is rated at 200 mW.

Feature Summary

• AEC-Q101 qualified for automotive reliability standards
• Halogen-free and RoHS compliant construction
• Optimized for automated surface-mount placement

Applications

• Automotive general-purpose switching circuits
• General-purpose amplification applications
• Low-power surface mount designs

Procurement Notes

Verify the specific suffix 'RFG' against official Taiwan Semiconductor documentation to confirm package type and reel specifications. Ensure the component meets AEC-Q101 requirements if used in automotive contexts. Cross-reference datasheets from authorized distributors to validate parameter consistency with the manufacturer's public data.

Selection Notes

Select this component for applications requiring small-signal PNP switching with high reliability standards. The SOT-323 package suits space-constrained designs. Verify that the 200 mW power dissipation rating aligns with the thermal management capabilities of the target circuit board layout.

Part Context

This part belongs to the BC857 series of general-purpose PNP transistors. It shares core electrical characteristics with variants like the BC857BWH but includes specific packaging or qualification suffixes. The series is widely used in consumer electronics and automotive systems requiring robust small-signal performance.

Replacement Considerations

Compatible substitutes include the BC857BWH and BC857BR. Verify pinout compatibility and ensure replacement parts meet the same AEC-Q101 qualification if required for the application.