This part is a kind of semiconductor called LNK364.

Function of this product has (LNK362 - LNK364) Low Power Off-Line Switcher IC.

Manufacturers : Power Integrations

Image and pinout :

Some of the text within the PDF file :

LNK362-364 LinkSwitch®-XT Family Energy Efficient, Low Power Off-Line Switcher IC Product Highlights Optimized for Lowest System Cost • Proprietary IC trimming and transformer construction techniques enable Clampless™ designs with LNK362 for lower system cost, component count and higher efficiency • Fully integrated auto-restart for short circuit and open loop protection • Self-biased supply – saves transformer auxiliary winding and associated bias supply components • Frequency jittering greatly reduces EMI • Meets HV creepage requirements between DRAIN and all other pins both on the PCB and at the package • Lowest component count switcher solution Features Superior to Linear/RCC • Accurate hysteretic thermal shutdown protection – automatic recovery improves field [ ... ]

LNK364 PDF Datasheet Download