onsemi NCP1055ST100T3

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NCP1055ST100T3 - High-Voltage Flyback Switching Controller

The NCP1055ST100T3 from onsemi is a high-performance 40W flyback switching controller designed for isolated AC-DC power conversion applications. Featuring a 700V breakdown voltage and 100kHz switching frequency, this controller delivers reliable performance across industrial, consumer, and telecom power supply designs.

Key Features

  • 40W Power Output - Optimized for low-to-medium power AC-DC applications
  • 700V High-Voltage Breakdown - Robust design for universal input voltage ranges
  • 100kHz Switching Frequency - Enables compact transformer design
  • Integrated Protection - Current limiting, overload, over-temperature, and open-loop fault protection
  • Wide Operating Range - -40°C to 150°C junction temperature
  • SOT-223 Surface Mount Package - Space-saving design for high-density PCB layouts

Applications

  • AC-DC adapters and chargers
  • Auxiliary power supplies
  • Consumer electronics power management
  • Industrial control systems
  • Telecom and networking equipment

Compliance: RoHS and REACH compliant. Full traceability documentation available. Authorized distributor with manufacturer-backed lifecycle support.

Product attributes Property Value
Manufacturer onsemi
Product Series
Packaging Tape & Reel (TR) |
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 700V
Topology Flyback
Voltage - Start Up 8.5 V
Voltage - Supply (Vcc/Vdd) 7.5V ~ 10V
Duty Cycle 77%
Frequency - Switching 100kHz
Power (Watts) 40 W
Fault Protection Current Limiting, Open Loop, Over Load, Over Temperature
Control Features -
Operating Temperature -40°C ~ 150°C (TJ)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Supplier Device Package SOT-223 (TO-261)