NCP1054ST44T3G

AC DC Converters, Offline Switchers Overview

The NCP1054ST44T3G is an integrated offline switcher designed for flyback converter topologies. It operates at a fixed switching frequency of 44 kHz and supports a maximum duty cycle of 77%. The device features an internal high-voltage power MOSFET with a breakdown voltage of 700 V, housed in a SOT-223 (TO-261) surface-mount package. It functions within a supply voltage range of 7.5 V to 10 V and includes startup circuitry activating at 8.5 V. The component provides comprehensive protection mechanisms including current limiting, open-circuit detection, overload protection, and thermal shutdown, ensuring reliable operation across a junction temperature range of -40°C to 150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage power switch and control logic into a single monolithic package for simplified design.
• Includes built-in fault protection mechanisms such as current limiting, thermal shutdown, and overload detection.
• Features a fixed switching frequency to simplify transformer design and EMI filtering requirements.

AC DC Converters, Offline Switchers Applications

• Offline AC-DC power supplies using flyback topology
• Low-power adapter designs
• Standby power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix T3G against official onsemi documentation to confirm RoHS compliance and packaging details. Confirm availability status as the part may be subject to end-of-life notices or discontinuation. Ensure the SOT-223 package variant matches your PCB footprint requirements. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring a simple, cost-effective solution for low-power offline conversion. The fixed 44 kHz frequency aids in minimizing passive component size. Consider the 700 V breakdown voltage for standard mains input ranges. Evaluate the thermal performance given the TO-261 package constraints for your specific power dissipation needs.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1054 series of integrated offline switchers from onsemi. These devices are engineered to reduce external component count by combining the controller and power switch. The series targets consumer electronics and industrial applications where space efficiency and reliability are critical for AC-DC conversion tasks.

AC DC Converters, Offline Switchers Replacement Considerations

Check for direct pin-compatible substitutes within the same family or newer generations. Verify that any replacement maintains the 44 kHz frequency and 700 V rating if those parameters are strict requirements. Consult official substitution guides for confirmed alternatives.