Photoresistor Light Sensitive 20mm LDR Sensor

Description:

• A 20mm LDR sensor is a light-sensitive resistor with a 20mm diameter.   
• It's made of semiconductor material that exhibits photoconductivity, meaning its electrical resistance decreases as the intensity of light increases.   
• These sensors are commonly used to detect the presence or intensity of light.   

Key Features:

• Light Sensitivity: Highly sensitive to visible light.   
• Variable Resistance: Resistance changes inversely with light intensity.   
• Compact Size: The 20mm size is suitable for various applications.   
• Reliability: Generally reliable and long-lasting.   
• Fast Response: Responds relatively quickly to changes in light.
• Good Spectral Response: Their spectral response is close to the human eye.  

Applications:

• Automatic Lighting Control: Streetlights, porch lights, and indoor lighting that turn on/off based on ambient light.   
• Camera Exposure Control: Used in cameras to adjust exposure settings.
• Security Systems: Light-based alarms and detectors.   
• Light Meters: Measuring light intensity.   
• Toys and Games: Light-activated toys and games.
• Industrial Automation: Light sensing in production lines.
• Automotive applications: Automated rear view mirrors, and headlight dimmers.   

Specifications (General):

• Diameter: 20mm   
• Maximum Voltage: Typically up to 500 VDC.   
• Maximum Power: Typically up to 500 mW.   
• Spectral Peak: Around 560nm (close to visible light).
• Light Resistance: Varies significantly, often in the range of a few kOhms to tens of kOhms in bright light.
• Dark Resistance: Very high, often in the mega-ohm range in darkness.   
• Response Time: Typically in the order of milliseconds.
• Operating Temperature: varies, but often in the range of -30 to +70 degrees Celcius.

DATA SHEET AND USECASE

Datasheet Overview:

The NTE Electronics LDR Series includes 20mm radial lead type photoresistors. Key specifications are:

• Resistance in Darkness: Approximately 1 MΩ
• Resistance at 10 lux: Approximately 9 kΩ
• Resistance at 1000 lux: Approximately 400 Ω
• Spectral Peak: 560 nm
• Maximum Voltage: 500 VDC
• Maximum Power Dissipation: 500 mW