onsemi NCP1051ST136T3

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NCP1051ST136T3 Flyback Switching Controller IC by onsemi

The NCP1051ST136T3 is a high-performance AC/DC offline flyback switching controller from onsemi, designed for reliable and efficient power conversion in isolated power supply applications up to 40W. This integrated controller features a 700V breakdown voltage rating and operates at a fixed 136kHz switching frequency, making it ideal for compact, cost-effective power supply designs.

Key Features & Benefits

  • Integrated 700V Power Switch: Eliminates the need for external MOSFETs, reducing component count and board space
  • 40W Power Handling: Suitable for a wide range of consumer, industrial, and telecom applications
  • Fixed 136kHz Switching Frequency: Enables predictable EMI performance and simplified filter design
  • Comprehensive Protection: Built-in current limiting, overload, over-temperature, and open-loop protection safeguard your designs
  • Wide Operating Range: 7.5V to 10V supply voltage with 8.5V startup threshold
  • 77% Maximum Duty Cycle: Optimized for flyback topology efficiency
  • Extended Temperature Range: -40°C to 150°C junction temperature for harsh environments
  • Compact SOT-223 Package: Surface mount design for automated assembly and space-constrained applications

Typical Applications

  • AC/DC adapters and chargers
  • Auxiliary power supplies
  • LED lighting drivers
  • Home appliances and white goods
  • Industrial control systems
  • Telecommunications equipment

All specifications are subject to change without notice. Please refer to the official onsemi datasheet for complete design information and application guidelines.


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Product attributes Property Value
Manufacturer onsemi
Product Series
Packaging |
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 136kHz
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)