ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)
About ams Investor Contact Us Newsroom Join Our Team Samples & Shop

TSL245R Light-to-Frequency

Infrared converter sidelooker package


The TSL245R light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter on a single monolithic CMOS integrated circuit. Output is a square wave (50% duty cycle) with frequency directly proportional to light intensity (irradiance) on the photodiode. The digital output allows direct interface to a microcontroller or other logic circuitry. The TSL245R is characterized for operation over the temperature range of −25°C to 70°C and is supplied in a 3-lead plastic side-looker package with an integral visible-light cutoff filter and lens. When supplied in the lead (Pb) free package, the devices are RoHS compliant.

Key Features

  • 1M:1 input dynamic range
  • Low dark frequency of 0.4 Hz (Typ)
  • High Irradiance Responsivity 0.6kHz/(µW/cm2) @ λp = 635nm
  • 2X gain lense
  • Spectral response from 850nm to 1000nm

Key Benefits

  • Detects light intensity at a high resolution
  • Provides low light level operation
  • Provides for high sensitivity to detect a small change in light 
  • Provides additional sensitivity advantages
  • Enables Infra-Red sensing capabilities

Product Facts

Supply Voltage [V] 2,7-5,5
Responsivity [Hz/uW/cm²] 500 @ 940
Output Frequency [Max.] 500 KHz
Selectable Sensitivity and Full-scale Output Frequency
Output Frequency Tolerances [+/- %] 50
Temperature Range [°C] -25 to 70
Packages S

Additional Information

  • Infra-Red sensing
  • Proximity sensing