Found 4 alternatives for OPB703WZ by TT Electronics/Optek Technology. Optical Sensors Reflective Analog Output — Module, Pre-Wired.
SNSR OPTO TRANS 76.2MM REFL C-MT
SNSR OPTO TRANS 3.81MM REFL C-MT
SNSR OPTO TRANS 3.05MM REFL L-MT
SNSR OPTO TRANS 5.59MM REFL C-MT