This was my morning puzzle today and I failed. I got on DK and browsed about 50 data sheets for that top marking format- no luck. Its obviously one of very many I2C/SMBUS Temp Sensors similar to the LM75 and in the standard pinout. The pins on the top are 1-4, with 1-3 being address inputs, and 4 being a ground. Pin 8 is Vcc and you've marked SDA, SCL and event in yellow. That top mark format doesn't match anyone's that I could find. Its also very possible that its a customer special of some kind. What kind of board did it come off of? There were only a few variants of these until they started putting them on DIMM modules under some JEDEC standard- then they went wild- MFG's tried to stuff read only data into them and created a mess. HDD guys did this too and really proliferated them. There was a thread about using them to "lock" HDD's. I've exhausted DigiKey- you might try an Asian Source with a decent search feature like LCSC? Get a beverage and some cookies, Good luck.