onsemi FSQ211

FSQ211 Fairchild Power Switch (FPS™) - Offline Flyback Switcher IC

The FSQ211 from onsemi is a high-performance integrated power switch designed for isolated AC/DC offline flyback converter applications. This FPS™ (Fairchild Power Switch) series device combines a 650V power MOSFET with advanced control circuitry in a compact 8-DIP through-hole package, delivering reliable and efficient power conversion for industrial, consumer, and telecommunications equipment.

Key Features & Benefits

• 650V High-Voltage MOSFET: Robust breakdown voltage for universal AC input designs (85-265VAC)
• Integrated Flyback Topology: Simplified design with built-in isolated output control
• 67kHz Fixed Switching Frequency: Optimized for low EMI and predictable magnetics design
• Wide Supply Range (7-20V): Flexible operation with 9V startup voltage
• Comprehensive Protection: Current limiting, overload, and over-temperature safeguards ensure long-term reliability
• 67% Maximum Duty Cycle: Efficient energy transfer for compact transformer designs
• Through-Hole 8-DIP Package: Easy prototyping, repair, and high-reliability assembly

Typical Applications

• AC/DC adapters and chargers (smartphone, laptop, consumer electronics)
• Auxiliary power supplies for industrial equipment
• Standby and housekeeping supplies
• LED driver power stages
• Set-top boxes and home appliances

Why Choose FSQ211?

The FSQ211 simplifies offline power supply design by integrating the high-voltage switch, control logic, and protection features into a single IC. This reduces component count, board space, and design complexity while improving reliability. With onsemi's proven FPS™ technology, you get consistent performance, full manufacturer documentation, and long lifecycle support—critical for aerospace, automotive, industrial, and telecom programs.

Authorized Distributor Stock: We supply genuine onsemi FSQ211 ICs with full traceability, datasheets, and design-in support. Global shipping available through authorized channels.

Need reference designs, application notes, or technical support? Contact our team for design-in assistance and long lifecycle availability guarantees.

• FSQ211.pdf