BD679ASTU

Overview

The BD679ASTU is an NPN power Darlington transistor manufactured by onsemi. It utilizes planar base island technology with a monolithic Darlington configuration. The device features good hFE linearity and high fT frequency performance. It includes an integrated antiparallel collector-emitter diode within the monolithic structure. The component is housed in a SOT-32 package and is designated for industrial grade applications.

Feature Summary

• Monolithic Darlington configuration with integrated antiparallel collector-emitter diode
• Good hFE linearity characteristics
• High fT frequency performance

Applications

• Industrial equipment requiring high current gain
• Power switching applications utilizing Darlington topology
• Circuits benefiting from integrated antiparallel protection diodes

Procurement Notes

Verify the specific suffix 'STU' against official onsemi documentation to confirm tape-and-reel packaging details, as generic datasheets may list tube packaging. Ensure the industrial grade classification matches the design requirements. Confirm RoHS compliance status directly with the manufacturer's current product status page before procurement.

Selection Notes

Select this component when a high-gain NPN power switch is required in a compact SOT-32 package. The integrated antiparallel diode simplifies circuit design for inductive loads. Verify that the thermal dissipation capabilities of the SOT-32 package meet the application's power requirements compared to larger packages.

Part Context

This part belongs to the BD679 series of NPN power Darlington transistors. The series is characterized by planar base island technology. Other variants in the family include BD679A and BD679, sharing similar core electrical characteristics but potentially differing in packaging or specific grading.

Replacement Considerations

Check for direct substitutes such as BD679A or BD679. Verify pinout compatibility and electrical parameter equivalence before substitution.