CNY70 Reflective Optical Sensor Technical Summary

Overview

The CNY70 is a reflective optical sensor featuring a compact construction where the emitting light source and the detector are arranged in the same direction. This configuration enables the device to sense the presence of an object by detecting reflected infrared light. The sensor combines an infrared emitter (typically an IR LED) and a phototransistor detector in a single package, making it ideal for applications requiring object detection, proximity sensing, or reflective surface analysis.

Designed for reliable performance in various environmental conditions, the CNY70 offers excellent noise immunity and stable operation. Its center-to-center alignment of emitter and detector optimizes sensing accuracy while maintaining a small form factor suitable for space-constrained applications.

Key Features

• Compact Integrated Design: Combines IR emitter and phototransistor in single package
• Reflective Sensing Technology: Detects objects by measuring reflected IR light
• Optimized Optical Alignment: Precise center-to-center arrangement of components
• High Sensitivity: Capable of detecting objects at varying distances
• Environmental Resistance: Stable performance in various lighting conditions
• Low Power Consumption: Suitable for battery-operated devices
• Cost-Effective Solution: Provides reliable sensing at competitive price point

Applications

The CNY70's versatile design makes it suitable for numerous applications across various industries:

Industrial Automation

• Object detection in conveyor systems
• Position sensing in manufacturing equipment
• Part presence verification
• Assembly line monitoring

Consumer Electronics

• Paper detection in printers and copiers
• Media sensing in audio/video equipment
• Proximity detection in smart devices

Automotive Systems

• Gear position sensing
• Seat belt detection
• Liquid level detection

Medical Devices

• Fluid level monitoring
• Disposable component detection
• Equipment positioning

Electrical Characteristics

Absolute Maximum Ratings

• Forward Current (IF): 60 mA (max)
• Reverse Voltage (VR): 5 V (max)
• Collector-Emitter Voltage (VCEO): 30 V (max)
• Emitter-Collector Voltage (VECO): 5 V (max)
• Collector Current (IC): 20 mA (max)
• Power Dissipation (Pd): 75 mW (max)
• Operating Temperature Range: -25°C to +85°C
• Storage Temperature Range: -40°C to +100°C

Optical Characteristics

• Emitter Wavelength: 950 nm (typical)
• Detector Sensitivity Range: 800 nm to 1100 nm
• Detection Distance: Up to 10 mm (dependent on surface reflectivity)
• Response Time: 15 μs (typical)

Recommended Operating Conditions

• Forward Current (IF): 20 mA (recommended)
• Forward Voltage (VF): 1.25 V (typical at 20 mA)
• Collector-Emitter Saturation Voltage: 0.4 V (max at IC = 0.5 mA)
• Dark Current: 100 nA (max at VCE = 5 V)

Package Information

Physical Dimensions

• Package Type: Through-hole, 4-pin DIP
• Length: 7.0 mm (typical)
• Width: 4.0 mm (typical)
• Height: 3.6 mm (typical)
• Pin Spacing: 2.54 mm (standard DIP spacing)

Pin Configuration

• Pin 1: Anode of IR Emitter
• Pin 2: Cathode of IR Emitter
• Pin 3: Emitter of Phototransistor
• Pin 4: Collector of Phototransistor

Material Specifications

• Housing Material: Black thermoplastic
• Lens Type: Infrared transparent
• Flammability Rating: UL94 V-0

Performance Considerations

Environmental Factors

The performance of the CNY70 can be affected by various environmental conditions:

• Ambient Light: Strong external light sources may affect detection reliability
• Temperature: Output characteristics vary with temperature changes
• Dust and Contaminants: May accumulate on lens surface over time
• Target Surface: Reflectivity and color of target objects affect detection range

Design Recommendations

• Implement proper current limiting for the IR emitter
• Consider using a pull-up resistor on the phototransistor output
• Provide adequate shielding from ambient light when possible
• Allow for proper ventilation in high-temperature environments
• Implement periodic cleaning in dusty environments

Conclusion

The CNY70 reflective optical sensor offers a reliable and cost-effective solution for object detection and proximity sensing applications. Its compact integrated design, combining both emitter and detector in a single package, simplifies system design while providing consistent performance. With proper implementation considering the electrical and environmental factors outlined in this document, the CNY70 can serve as an excellent choice for a wide range of industrial, consumer, and automotive applications requiring reflective object sensing.