BC857BQAZ

Overview

The Nexperia BC857BQAZ is a PNP general-purpose bipolar junction transistor (BJT) designed for surface-mount applications. It operates with a maximum collector current of 100 mA and features a collector-emitter voltage rating of 45 V, alongside a collector-base voltage of 50 V. The device is housed in the DFN1010D-3 package, measuring 1.0 mm by 1.0 mm, which provides a compact footprint suitable for space-constrained designs. It is qualified to AEC-Q101 standards for automotive reliability, ensuring robust performance across a wide operating temperature range from -55 °C to +150 °C.

Feature Summary

• AEC-Q101 qualified for automotive-grade reliability and durability
• Ultra-small leadless DFN1010D-3 package minimizes board space requirements
• High DC current gain ensures efficient signal amplification and switching

Applications

• Automotive electronic systems requiring reliable small-signal processing
• General-purpose switching and amplification circuits
• Low and medium frequency AC applications

Procurement Notes

Verify the specific suffix QAZ against official Nexperia documentation to confirm the DFN1010D-3 package and AEC-Q101 qualification status. Ensure that the ordering information matches the exact electrical parameters required for your design, as suffixes often denote variations in packaging or binning rather than functional changes. Cross-reference the datasheet revision date to guarantee access to the most current technical specifications and handling guidelines.

Selection Notes

Select this component when a compact, automotive-qualified PNP transistor is required for low-power signal handling. The DFN1010D-3 package offers superior thermal performance compared to traditional SOT-23 packages due to its leadless design. Consider this part for designs where board real estate is limited but high reliability under varying thermal conditions is essential. Verify compatibility with existing PCB footprints before finalizing the selection.

Part Context

This component belongs to the BC857 series of PNP transistors, which are widely used in consumer and industrial electronics. The BC857B variant specifically denotes a standard DC current gain range within the series. The addition of the QAZ suffix indicates a specific tape-and-reel packaging format and potentially automotive-grade screening, distinguishing it from standard commercial versions while maintaining core electrical characteristics consistent with the broader family.

Replacement Considerations

Direct replacements include other AEC-Q101 qualified PNP transistors in the DFN1010D-3 package with matching 45 V VCEO ratings. Verify pinout compatibility and thermal resistance values when substituting with components from different manufacturers to ensure equivalent circuit performance.