onsemi FSDL321L

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FSDL321L - High-Performance Flyback Switching IC

The FSDL321L from onsemi is a high-reliability 650V flyback switching IC designed for offline power conversion applications. Part of the FPS™ (Fairchild Power Switch) series, this integrated power switch delivers up to 17W of power with exceptional efficiency and comprehensive protection features.

Key Features & Benefits

  • 650V High-Voltage Breakdown - Robust design for demanding industrial and telecom applications
  • Integrated Power Switch - Reduces component count and simplifies circuit design
  • 17W Power Output - Ideal for low-to-medium power AC/DC converters
  • 50kHz Switching Frequency - Optimized for efficiency and EMI performance
  • Comprehensive Protection - Built-in current limiting, over-load, over-temperature, and over-voltage protection
  • Wide Operating Range - 8V to 20V supply voltage, -25°C to 85°C ambient temperature
  • Compact 8-LSOP Package - Space-saving surface mount design for high-density PCB layouts

Typical Applications

  • AC/DC adapters and chargers
  • Auxiliary power supplies
  • Industrial control systems
  • Telecommunications equipment
  • Consumer electronics power management
  • Smart home and IoT devices

Why Choose FSDL321L?

This switching IC combines onsemi's proven FPS™ technology with robust protection features, making it an excellent choice for engineers designing reliable, cost-effective power supplies. The integrated approach reduces external component requirements, lowers BOM costs, and accelerates time-to-market for your power conversion designs.

All products are sourced from authorized distributors with full traceability and comply with RoHS/REACH standards. Long lifecycle availability ensures design-in confidence for mission-critical applications.

Product attributes Property Value
Manufacturer onsemi
Product Series FPS™
Packaging Bag |
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 650V
Topology Flyback
Voltage - Start Up 12 V
Voltage - Supply (Vcc/Vdd) 8V ~ 20V
Duty Cycle 77%
Frequency - Switching 50kHz
Power (Watts) 17 W
Fault Protection Current Limiting, Over Load, Over Temperature, Over Voltage
Control Features -
Operating Temperature -25°C ~ 85°C (TA)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case 8-SMD, Gull Wing
Supplier Device Package 8-LSOP