Component ID

[BillyO]

I'd appreciate it if anyone could get me on the right track with this thing.

It's obviously an optical device of some sort.  The internal device is TO-5 sized and it has a thick aluminum enclosure.  None of the 4 leads are grounded to the case.

There are no markings of any kind on it.

[BillyO]

Ahhh,

I think I may have found it.  It might be a Melexis MLX90614 infrared sensor.

Some day I'll have to hook it up to an Arduino and try it out.

[Benta]

Looks more like a laser diode to me.

[barshatriplee]

Yeah. Can be an MLX90614. Personally, I used only silver coloured ones like this:

https://www.theengineeringprojects.com/2019/05/introduction-of-mlx90614.html

But I can see this one has a black version too:
https://www.aliexpress.us/item/3256801230944509.html?gatewayAdapt=glo2usa4itemAdapt

[Kean]

I have some of the black MLX90614ESF-BCC parts, and they look just like that - but they also have a part/batch? number printed on the side in white "BCC4578D01".  Same with the longer BCI variant.