BCX55-QX

Overview

The BCX55-QX is an NPN medium power transistor manufactured by Nexperia USA Inc. It operates with a maximum collector-emitter voltage of 60 V and supports a continuous collector current of 1 A. The device utilizes a SOT-89 (SC-62) surface-mount package featuring an exposed heatsink for thermal management. Key electrical parameters include a collector-base voltage of 60 V, an emitter-base voltage of 5 V, and a collector-emitter saturation voltage of 500 mV. Power dissipation is rated at 500 mW, with a transition frequency of 180 MHz. The component functions within a temperature range of -55 °C to +150 °C junction temperature.

Feature Summary

• High current capability suitable for demanding switching applications
• Exposed heatsink design providing excellent thermal and electrical conductivity
• Automotive grade qualification ensuring reliability in harsh environments

Applications

• Linear voltage regulators
• MOSFET drivers
• Low-side switches
• Power management circuits

Procurement Notes

Verify the specific suffix designation against official Nexperia documentation to confirm automotive compliance status. Ensure the ordering part number matches the required gain binning and packaging format. Cross-reference the datasheet revision date to validate parameter accuracy before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring robust NPN switching with high thermal performance in a compact SMD footprint. The exposed pad facilitates efficient heat transfer to the PCB copper plane. Verify that the 60 V rating aligns with the circuit's maximum operating voltage and transient conditions.

Part Context

This part belongs to the BCX55 series of NPN medium power transistors. It serves as the complement to the BCX52 PNP series. The QX suffix typically indicates automotive-grade qualification under AEC-Q101 standards, distinguishing it from standard commercial variants while maintaining identical electrical pinouts and mechanical dimensions.

Replacement Considerations

Direct substitutes include the BCX55-10 or BCX55-16 for general purpose use. For automotive applications, verify equivalent AEC-Q101 qualified parts from Nexperia or other manufacturers offering matching SOT-89 packages and 60 V/1 A ratings.