| Image | Part Number | Manufacturer | Description |
|---|---|---|---|
| H21A4 | Onsemi | Photointerrupter Transmissive 3.3mm Phototransistor 4-Pin Rail | |
| EE-SX772P | Omron | Optical Switches, Transmissive, Phototransistor Output SLOT DARK-ON PNP | |
| EESX472P | Omron | Photoelectric Sensor Thru-beam Light ON PNP 0.005m 4-Pin | |
 | EE-SX870R | Omron | SENSOR OPTICAL 5MM MOD WIRE LEAD |
 | LTH-301-32 | Vishay | PHOTOINTERRUPTER SWITCH PTR SLOT |
 | GP1S73P2J00F | Sharp | SENSOR OPT SLOT PHOTOTRANS MODUL |
 | H22B4 | Onsemi | Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail |
 | H22B5 | Onsemi | Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail |
 | EE-SY201 | Omron | OPTO SENSOR REFLECT TYPE 4MM |
 | H21B5 | Onsemi | Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail |
 | EE-SX871R | Omron | SENSOR OPTICAL 5MM MOD WIRE LEAD |
| LTH-301A | Vishay | SENSOR OPT SLOT MODULE | |
 | MAX44009EDT+T | Maxim | SENSOR AMBIENT LIGHT 6UTDFN |
 | H22A4 | Onsemi | Photointerrupter Transmissive 3.3mm Phototransistor 4-Pin Rail |
 | EE-SX870P | Omron | Optical Switches, Transmissive, Phototransistor Output THIN COMPACT SLOT PM S PNP L-ON |
 | EE-SX305 | Omron | SENSOR OPTICAL 3.4MM PCB MOUNT |
| QCK3 | Onsemi | Photointerrupter Transmissive 4mm Phototransistor 4-Pin SMT Rail | |
| H22B3 | Onsemi | Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail | |
| H22B6 | Onsemi | Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail | |
| H21B4 | Onsemi | Photointerrupter Transmissive 3.3mm Photodarlington 4-Pin Rail |
