What is this?

I found this little guy in a box of random parts.

What a nifty little thing! I'll guess that's a pin diode and a demodulator chip for an infrared remote control receiver.

yes I am going with a IR recever.

I think I bought a similar thing from a surplus outfit and they were dubbed an intensity controller. Mine are marked 043H. Somewhere I could have a datasheet and the full part number. I have three.

They belong in a "Photo IC" category: **broken link removed**

The synchronous laser detector is mighty close -
https://www.electro-tech-online.com/custompdfs/2011/11/s10456_kpic1070e02.pdf

OP's chip is bigger, though. Seems to be too much stuff on there for just level detection... unless they are doing A/D with a serial output or give you programmable trip points or something. It has 5 actual bond connections to the lead frame, and one of those is hooked straight to the detector - so with Vcc and Gnd that leaves 2 pins to get the signal out. Synchronous serial communications generally uses 3. Still looks like a demodulator to me.

I do remember disassembling a laser printer.

that is light sensor ic. mostly use in cd-dvd driver , dvd player or like u say laser printers that use laser beams..

Sweet. Thanks gents.