The Fairchild/ON Semiconductor FSDH321 is a surface mount integrated circuit designed for flyback topology power supplies. It has an output isolation feature and internal switch(s) which makes it suitable for use in a variety of applications.

• Voltage Breakdown: 650V
• Power Rating: 17W
• Duty Cycle: 67%
• Switching Frequency: 100kHz
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage

The FSDH321 is commonly used in power supply designs and has a high popularity rating in the market.