The Omron EE-SX772P is a through-beam photoelectric sensor with a 5 mm slot gap, delivering a PNP open-collector Dark-ON output. It runs on a 5 V supply and switches up to 30 mA. The housing mounts to a chassis or machine frame via M3 screws, with a wire lead for connection. This is the part for detecting the presence or edge of a part, flag, or label in a tight slot — think pick-and-place end-of-travel, conveyor gate position, or print-registration mark sensing inside a cabinet.
5 mm slot — what it fits
The 5 mm sensing distance (0.197 in) is the gap between the emitter and receiver inside the fork. That is sized for thin targets — paper, film, small-diameter wire, or a flag on a moving mechanism. It will not see through a 10 mm bracket or a thick part. If your application needs to detect a part that is wider than the slot, this is not the sensor; look at the EE-SPW311 with its 39.37 mm adjustable range. The 5 mm slot is fixed, no adjustment.
PNP Dark-ON output — wiring it in
The output is PNP open collector, Dark-ON — meaning the transistor turns on (sinks current from the load to ground) when the beam is blocked. That is the opposite of Light-ON (output on when beam is unblocked). If your PLC input card expects NPN sinking inputs, this part will not drive it directly without a pull-up resistor or interface relay. The EE-SPX305-W2A is the NPN Dark-ON equivalent in the same 5 mm slot form factor, but with a narrower -10°C to 55°C temperature range. For a PNP system, the EE-SX772P is the direct fit.