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Omron EE-SX770 — Interface & Transceivers
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Omron / Interface & Transceivers

Omron EE-SX770 Through-Beam Optical Sensor, 5 mm, NPN Dark-ON

MPN EE-SX770
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Omron EE-SX770, Through-Beam Optical Sensor, 5 mm sensing distance, NPN Open Collector/Dark-ON output, 5 V supply, -25°C to 55°C, Chassis Mount with M3 screw, Tray package.

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[SPEC] Essential Parameters Snapshot Full Specifications (9)
Supply Voltage 5.0

Full Technical Specifications

9 Parameters
EE-SX770 specifications
Parameter / AttributeSpecification / Value
MountingChassis Mount, M3 Screw
Operating temperature high-25°C to 55°C (TA)
Output signalNPN - Open Collector/Dark-ON
Package_typeTray
Sensing_typeThrough-Beam
StatusActive
Supply voltage5.0
Switching current0.035
Sensing distance max0.197
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Technical Details & Description

Dark-on means the NPN transistor pulls the output low (sinks current) when the light beam is blocked. With the beam uninterrupted, the output is off (high-impedance). This is standard for fail-safe detection: a broken wire or lost power leaves the output off, which a PLC can interpret as a blocked condition.

Temperature range — indoor automation, not the oven

Rated for -25°C to 55°C ambient. This covers most factory-floor and warehouse environments but does not extend to hot machine enclosures, paint booths, or freezer applications. If the sensor sits near a motor housing or oven wall, check the local ambient temperature at the mounting point — not the room average.

For a BOM freeze or long-term supply plan, this part is currently stable; no need to chase an alternate yet.

Frequently asked questions

What is the EE-SX770 datasheet?

The Omron EE-SX770 datasheet covers the through-beam slot sensor with 5 mm sensing distance, NPN open-collector dark-on output, 5 V supply, and -25°C to 55°C operating temperature. It is available from Omron's documentation portal or through component distributors.

What is the EE-SX770 equivalent?

A close functional peer is the Omron EE-SPX305-W2A, which also uses NPN open-collector dark-on output and a through-beam slot. The EE-SPX305-W2A has a wire-lead mounting instead of M3 screw and a narrower temperature range of -10°C to 55°C. Verify the mounting and temperature requirements before substituting.

What does dark-on mean for EE-SX770?

Dark-on means the NPN output transistor turns on (sinks current to ground) when the light beam is blocked. When the beam is clear, the output is off. This is a fail-safe logic: a blocked beam equals an active output, so a wiring fault or power loss defaults to the blocked state.

How to connect EE-SX770 to a PLC?

Wire the output to a PLC sinking (NPN) digital input. With a 5 V supply, the open-collector output pulls down when the beam is blocked. Use a pull-up resistor on the PLC input if the module expects a voltage signal; otherwise, the NPN transistor sinks the input current directly. The 35 mA switching current is sufficient for most PLC input cards.

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