recently I purchased two MLX90614-AAA from Ebay. At first look they have different markings (printed instead of engrawed) and marking says "B89736X20E".
I connected them to my hardware and they don't work. Older sensors I have (with engraved marking MLX90614...) work ok. I tried several codes from internet.
Does anyone have a similar problem? I suspected they are fake and opened one can. There is a wafer chip and a sensor where it should be as in "genuine" MLX.
Thanks for sharing your experience.