QTY-1 TT Electronics/Optek Technology OPB857 Phototransistor Module, Pre-Wired

TT Electronics/Optek Technology OPI1264B QTY-2

Optek OPB821S10 Photointerrupter Transmissive 2.03mm Phototransistor 4-Pin

Omron EE-SX1088-W11 Optical Switches, Transmissive, Phototransistor (10 pk)

(5 PCS) TCST1202 Photointerrupter Transmissive 3.1mm Phototransistor 4-Pin

5PCS PC817 EL817C LTV817 PC817-1 80V 20mA OPTOCOUPLER Phototransistor DIP-4