Ricoh Photosensor

This reflective photosensor module combines a high-sensitivity phototransistor with an integrated infrared LED, providing reliable non-contact object detection in a compact through-hole package. Its NPN open collector output delivers fast 15 µs response and operates from a 3.3V to 5V DC supply, making it ideal for paper detection, position encoding, and presence sensing in printers, copiers, and automated equipment.

Advantages

The sensor's reflective detection method eliminates the need for a separate light source, simplifying integration and reducing component count. The 940 nm infrared emission ensures excellent immunity to visible light interference, while the wide sensing distance from 0.5 mm to 12 mm accommodates various mounting tolerances. With an operating temperature range of -25°C to +85°C and RoHS compliance, it is built for demanding industrial environments.

Suitable for

• Paper detection in printers and copiers
• Object presence sensing in automated assembly lines
• Position encoding in motorized systems
• Edge detection in robotics and CNC machines
• Slot sensors for vending and ticketing machines

Key specifications

• Sensor type: Phototransistor
• Detection method: Reflective
• Emitter: Integrated infrared LED (940 nm peak)
• Output type: NPN open collector
• Supply voltage: 3.3V to 5.0V DC
• Collector current: 20 mA max
• Sensing distance: 0.5 mm to 12 mm
• Response time: 15 µs typical
• Operating temperature: -25°C to +85°C
• Storage temperature: -40°C to +100°C
• Package: Through-hole PCB mount module, 4 pins
• Material: Epoxy resin, silicon die
• RoHS compliant, lead-free

Recommendations

For optimal performance, ensure the target surface is within the specified sensing distance and has sufficient reflectivity. Use a bypass capacitor near the power pins to minimize noise. Avoid direct sunlight or strong IR sources that may saturate the phototransistor. This module is a direct replacement for Ricoh part G1752551 in compatible equipment.