Description:
An LDR (or photoresistor) is a light-controlled variable resistor. It operates on the principle of photoconductivity: as the intensity of light falling on the sensor increases, its electrical resistance decreases. At 20mm in diameter, these sensors are significantly more sensitive than smaller models and are often utilized in systems requiring a wide field of view for light detection. They are commonly used in automatic street lighting, camera exposure controls, and as "beam breakers" in security systems.
Features:
Large Sensing Surface: The 20mm diameter provides superior light gathering, useful for low-light or outdoor environments.
Epoxy Encapsulation: Moisture-resistant coating ensures long-term reliability and stability.
Human Eye Response: The spectral peak is approximately 560nm, closely matching the peak sensitivity of the human eye.
Versatile Range: Transitions from several mega-ohms in total darkness to low kilo-ohms in bright light.
Rugged Build: Housed in a durable ceramic package with through-hole leads for easy breadboard prototyping or PCB soldering.
Specifications:
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Diameter: 20mm
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Max Voltage: 500V
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Max power consumption: 500mW
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Operating Temperature: – 30 – +70°C
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Light Resistance: 5-100K ohm
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Dark Resistance: 1-8M ohm
