BC857BQAZ

Overview

The BC857BQAZ is a PNP general-purpose small-signal transistor manufactured by NXP Semiconductors. It is housed in a SOT23 (SC-74) plastic surface-mount package. The device features a maximum collector current of 100 mA and a collector-emitter voltage rating of 45 V. It exhibits a minimum DC current gain (hFE) of 220, ensuring reliable amplification performance. The component operates at a transition frequency of 150 MHz and has a maximum collector-emitter saturation voltage of 0.65 V. It is designed for applications requiring low current switching and amplification within standard operating temperature ranges.

Feature Summary

• PNP silicon small-signal transistor optimized for general-purpose switching and amplification tasks
• Low current handling capability with a maximum collector current of 100 mA
• High DC current gain providing efficient signal control in low-power circuits
• Compact SOT23 surface-mount package suitable for automated assembly

Applications

• General purpose switching circuits
• Small signal amplification stages
• Low power analog applications

Procurement Notes

Verify the specific suffix 'QAZ' against official NXP documentation to confirm tape-and-reel packaging and quality grade specifications. Ensure the part number matches the exact electrical characteristics required for your design, as variations exist within the BC857 family. Cross-reference the manufacturer's latest datasheet for any updates on lead-free compliance or RoHS status before finalizing procurement orders.

Selection Notes

Select this component when a compact PNP transistor is needed for low-current switching or amplification. The high hFE ensures good gain stability. Compare the 45 V breakdown voltage against circuit requirements to ensure adequate headroom. Consider the SOT23 package size constraints and thermal dissipation capabilities relative to the expected load current and ambient temperature conditions.

Part Context

The BC857 series comprises PNP general-purpose transistors widely used in consumer electronics and industrial equipment. The BC857B variant specifically offers higher current gain compared to standard versions. This component serves as a fundamental building block for discrete logic interfaces, driver circuits, and audio pre-amplifiers where space efficiency and cost-effectiveness are prioritized over high-power handling.

Replacement Considerations

Official substitutes include the BC857BR and BC857BW from NXP, which share identical pinouts and core electrical specifications but may differ in packaging format or binning criteria. Verify compatibility with the BC857C variant if higher gain is acceptable.