NCP1077STBT3G

AC DC Converters, Offline Switchers Overview

The NCP1077STBT3G is a high-voltage AC/DC converter switcher from onsemi, designed for offline power supplies. It integrates a 700V MOSFET and a current-mode PWM controller within a single package. The device utilizes flyback topology with a fixed switching frequency of 100 kHz. It features dynamic self-supply technology, eliminating the need for an auxiliary winding in many applications. Key electrical characteristics include a peak current limit of 800 mA and an operating supply voltage range of 7.7 V to 8.5 V. The component operates within a temperature range of -40°C to +125°C and is housed in a SOT-223-4 surface-mount package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V MOSFET with a current-mode PWM controller for compact offline SMPS designs.
• Employs dynamic self-supply technology to simplify transformer design by removing auxiliary winding requirements.
• Includes built-in protection mechanisms such as overvoltage protection, short-circuit protection, and thermal shutdown.
• Features frequency jittering to improve electromagnetic interference (EMI) performance.

AC DC Converters, Offline Switchers Applications

• Low power offline switched-mode power supplies
• AC/DC converters for consumer electronics
• Battery chargers and adapters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix STBT3G confirms the SOT-223-4 package and 100 kHz frequency variant. Confirm RoHS compliance status through official manufacturer documentation. Ensure the ordering part number matches the required pinout and thermal specifications for the target PCB layout. Cross-reference the datasheet revision date to ensure compatibility with latest manufacturing standards.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring a cost-effective, integrated solution for low-power offline conversion. The 100 kHz frequency offers a balance between component size and efficiency. Consider the SOT-223-4 package for space-constrained designs. Verify that the 800 mA peak current capability meets the load requirements. Evaluate the need for auxiliary winding support if higher standby efficiency is critical.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1077 series of high-voltage switchers from onsemi. The series is designed for standalone operation without external discrete components, reducing bill of materials cost. The NCP1077 family targets low-power applications where simplicity and reliability are paramount. The STBT3G designation specifically identifies the tape-and-reel packaging format for automated assembly.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1077P065G: Alternative PDIP-7 through-hole version of the same functional core. NCV1077CSTBT3G: Automotive-grade qualified variant with AEC-Q100 certification. Verify pinout compatibility and thermal performance differences when substituting.