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Ambient light sensor achieves human eye's spectral sensitivity

Posted: 13 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:sensor? light sensor? phototransistor? New Japan Radio? control?

Ambient light sensor from New Japan Radio

New Japan Radio Co. Ltd has introduced a silicon phototransistor-type ambient light sensor for On/Off control of interior lights, toys, TVs and other devices, according to the brightness of surroundings and for automatic control of display brightness.

The NJL7502L is configured with a phototransistor plus an optical filter that uses the company's original resin lamination technology to reduce the risk of malfunction caused by IR rays. With spectral sensitivity approaching that of the human eye, the sensor is highly accurate for various controls.

Eco-friendly silicon material is used for the phototransistor block, making this product a suitable replacement for the usual CdS-based cell-type ambient light sensors. The NJL7502L is housed in a top-view, pin-type package for easy CdS cell replacement.

The NJL7502L outputs sufficient light current more efficiently than conventional photo diode-type sensors.

Other product characteristics include:

  • Peak sensitivity wavelength of 560nm typ.

  • Light current of 33?A typ., Ev = 100lux, fluorescent light source

  • Half-value angle of 20 typ.

  • Dark current of 0.1?A max. VCE = 20V

Samples and production quantities are currently available. Pricing is about 25 cents per unit.




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