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Small Photoresistors, LDR (Light Dependent Resistor)


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A photoresistor or light-dependent resistor (LDR) or photocell is a resistor whose resistance decreases with increasing incident light intensity; in other words, it exhibits photoconductivity.
A photoresistor is made of a high resistance semiconductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electron (and its hole partner) conduct electricity, thereby lowering resistance.


  • Model: 5528
  • The maximum voltage (V-dc): 150]
  • Maximum power dissipation (mW): 100
  • Ambient temperature (°C): - 30 to +70
  • Spectral peak (nm): 540
  • Light resistance (10Lux) (KΩ): 10-20
  • Dark resistance (MΩ): 1
  • 100λ10: 0.6
  • Response Time (ms): rose: 20
  • Drop: 30
  • Illumination resistance characteristic: 3

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