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AS7331 Spectral UV Sensor

3 channel spectral UV-A/B/C sensor


  • Interference filter technology
  • 3 channel UVA/B/C sensing
  • High dynamic range, adjustable to the application conditions
  • Class leading sensitivity
  • Broad conversion range
  • Extended temperature range


  • No filter aging or drifts over lifetime and temperature
  • Separated UVA/B/C radiation detection incl. daylight (VIS+NIR) blocking
  • Sensor settings adjustable from low to bright radiation conditions
  • Fast or high accurate radiation and fluorescence detection possible
  • Usability in harsh environments

Product parameters

Sensor Type 3 channel UV-A/B/C sensor
Applications UV-disinfection, UV-curing, Partial discharge monitoring, Analytics (water quality, microorganism contaminations), Phototherapy, skin diagnostics, Horticulture
I/O fast I2C
Package OLGA16
Size [mm] 3.6x2.6x1.09
Supply Voltage [V] 3,3
Temperature Range [°C] -40°C - 105°C

General description

The AS7331 is a low-power, low noise integrated UV sensor. The three separated UVA, UVB and UVC channels convert optical radiation signals via UV optimized photodiodes to a digital result and realize a continuous or triggered measurement. The irradiance responsivity can be adjusted via Gain, conversion time and internal clock frequency to effect sensitivity, full scale range and LSB. The by the AS7331 detected amount of radiation in the set Gain and conversion time configuration will be provided as digital counts by the AS7331. The AS7331 offers a range of 12 Gain steps by a factor of two for each step. The conversion time is internally controlled over a wide range of 15 steps by a factor of two for each step. With the input pin (SYN), the conversion time can be externally controlled to adapt the measurement to the given environment and time base.
With its irradiance responsivity factor and conversion time, the AS7331 supports an overall huge dynamic range up to 3.43E+10 (resolution multiplied by gain range). It achieves an accuracy of up to 24-bit signal resolution (internal via I²C and shifter 16-bit), with an irradiance responsivity per count down to 2.38 nW/cm² at 64 ms integration time. Via an integrated divider, the 16-bit I²C output can be adjusted to the significant bits of interest.

This product suits for the following applications:

  • UV-disinfection
  • UV-curing
  • Partial discharge monitoring
  • Analytics (water quality, microorganism contaminations)
  • Phototherapy, skin diagnostics
  • Horticulture


Title Category Headline Buy
AS7331 Eval Kit Application Board Evaluation Kit for AS7331 UV Sensor


Type Description Language
Evaluation Software Please read "readme.txt" & "Safety notification.txt" before using the EVK. The AS7331_EvalSW zip file contains SW, HW, FW, SDK, and relevant files. EN

Technical documents

Type Description Language
Datasheet DS001047 English
Other Product Document AS7331 Design Guidelines English

Environmental documents

Type Description Language
RoHS Certificate RoHS Certificate AS7331 English

Other information

Type Description Language
Block Diagram AS7331 Block diagram
Image AS7331 sensor bottom view
Image AS7331 sensor bottom perspective view
Image AS7331 sensor combined view
Image AS7331 sensor perspective combined view
Image AS7331 sensor top perspective view
Image AS7331 sensor top view
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