MOC7811 Slotted Opto Isolator Module (Encoder Sensor)

The MOC7811 Slotted Opto Isolator Module (Encoder Sensor) is a compact optical interrupter designed for non-contact position, speed and motion detection. It consists of an infrared emitting diode and a silicon phototransistor positioned opposite each other inside a slotted plastic housing. When an object, encoder disc or other obstruction passes through the slot, it interrupts the infrared beam and changes the output state of the phototransistor.

The MOC7811 is widely used in robotics, motor control, rotary encoders, position detection, object counting and automation systems. Its slotted construction provides reliable optical switching without physical contact, helping reduce mechanical wear. The through-hole terminals and mounting holes make the sensor convenient for integration into PCBs, prototypes and custom electronic assemblies.

Technical Specifications:

• Model: MOC7811
• Sensor Type: Slotted Optical Interrupter
• Emitter: Infrared LED
• Detector: Silicon NPN Phototransistor
• Output Type: Phototransistor Output
• Forward Current: Up to 50mA
• Typical LED Forward Voltage: 1.3V
• Maximum LED Forward Voltage: 1.8V
• Collector-Emitter Voltage: Up to 30V
• Slot Width: Approx. 3mm
• Slot Depth: Approx. 7mm
• Pin Pitch: Approx. 2.54mm
• Mounting Hole Spacing: Approx. 19mm
• Mounting Hole Diameter: Approx. 3mm
• Mounting Type: Through Hole

Features:

• Non-contact optical sensing
• Integrated infrared emitter and phototransistor
• Slotted design for object interruption detection
• Compact and lightweight construction
• Suitable for position and speed sensing
• Easy PCB and panel mounting
• Suitable for encoder disc applications

Applications:

• Motor speed measurement
• Rotary encoder systems
• Position and motion detection
• Robotics projects
• Object counting systems
• Printer and paper-feed sensing
• Industrial automation systems
• Limit and position sensing circuits