Overview
A photoresistor is a resistance made of a semiconductor material whose conductivity changes with the change of illuminance. This feature is used to make photoresistors of different shapes and light-receiving areas. Photoresistors are widely used in toys, lamps, cameras and other industries.
Feature
★ Epoxy encapsulation
★ Good reliability
★ Small size
★ High sensitivity
★ Fast response
★ Good spectral characteristics
Datasheet
| Specification | Type | Maximum Voltage | Maximum power | Environmental Temp. | Spectrum peak value | Light resistance(10Lux)(KΩ) | Dark resistance(MΩ) | Response time(ms) | |
| Increase | Decrease | ||||||||
| φ7 series | GL7516 | 150 | 100 | -30~+70℃ | 540 | 5- 10 | 0.5 | 30 | 30 |
| GL7528 | 150 | 100 | -30~+70℃ | 540 | 10- 20 | 1 | 30 | 30 | |
| GL7537-1 | 150 | 100 | -30~+70℃ | 560 | 20- 30 | 2 | 30 | 30 | |
| GL7537-2 | 150 | 100 | -30~+70℃ | 560 | 30- 50 | 4 | 30 | 30 | |
| GL7539 | 150 | 100 | -30~+70℃ | 560 | 50- 100 | 8 | 30 | 30 | |
Design considerations
Photoresistors are less light-sensitive devices than photodiodes or phototransistors: the two latter components are true semiconductor devices, while a photoresistor is a passive component and does not have a PN-junction. The photoresistivity of any photoresistor may vary widely depending on ambient temperature, making them unsuitable for applications requiring precise measurement of or sensitivity to light photons.
Applications
Photoresistors come in many types. Inexpensive cadmium sulfide cells can be found in many consumer items such as camera light meters, clock radios, alarm devices (as the detector for a light beam), nightlights, outdoor clocks, solar street lamps and solar road studs, etc.
FAQ
1.What is an LDR (Light Dependent Resistor)?
An LDR is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits.
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