The TOP253PN is a high-performance, off-line switcher IC featuring an integrated 700V power MOSFET. Designed for energy-efficient power supplies, it offers precise control and protection for industrial and consumer electronic applications. TOP253PN – Power Integrations (TOPSwitch®-HX Series) The component shown in your image is TOP253PN, manufactured by Power Integrations. It belongs to the TOPSwitch®-HX family of integrated offline switching power supply ICs. Product Specifications Parameter Specification Manufacturer Power Integrations Part Number TOP253PN Series TOPSwitch®-HX Package DIP-8 (7 Leads), Through-Hole Type Offline PWM Switcher / AC-DC Converter IC Integrated MOSFET 700 V Power MOSFET Switching Frequency 66 kHz Input Voltage 85–265 VAC Universal Input Output Power Up to 25 W (Open Frame), up to 38 W (Peak/Adapter Design) Operating Temperature -40°C to +150°C Protection Over Temperature, Over Voltage, Current Limit, Auto-Restart RoHS Yes The TOP253PN integrates a 700 V power MOSFET, PWM controller, startup circuitry, protection functions, and control logic into a single IC, simplifying the design of isolated flyback power supplies. Typical Applications SMPS Power Supplies LED Drivers Battery Chargers Industrial Control Power Supplies Home Appliance Power Supplies Adapters & Chargers Set-Top Boxes TV & Monitor SMPS Printer Power Supplies Key Features Universal AC input (85–265 VAC) Integrated 700 V MOSFET EcoSmart® low no-load power consumption Soft-start function Auto-restart protection Thermal shutdown Line under/over-voltage protection High efficiency with minimal external components