Vishay Vcnl36821s Ired Integrated Proximity Sensor

Vishay VCNL36821S IRED Integrated Proximity Sensor is fully integrated with an infrared emitter, a photodiode for proximity measurement, and a signal processing IC in a single package with a 12-bit ADC. With a range of up to 30cm (12″), this stand-alone component simplifies the use and design-in of proximity sensors as no mechanical barriers are required to optically isolate the emitter from the detector. The VCNL36821S is offered in a miniature, surface mount, 2.55mm x 2.05mm leadless package (LLP) with a low profile of 1mm. The device is designed to meet the low height requirements needed for use in smartphones, mobile phones, digital cameras, and tablet PC applications.

Vishay Vcnl36821s Ired Integrated Proximity Sensor


  • Surface mount package type
  • 2.55mm x 2.05mm x 1.0mm (LxWxH) in dimension
  • Integrated modules
    • Infrared emitter (IRED)
    • Proximity sensor (PS)
    • Signal conditioning IC
  • Interrupt function
  • Small light hole opening design
  • Immunity to red glow issues (940nm)
  • 1.7V to 3.6V supply voltage range
  • Low power consumption I2C (SMBus compatible interface)
  • 168-hour floor life, MSL 3, according to J-STD-020
  • I2C bus (PS) output type
  • -40°C to +85°C temperature compensation


  • Supply voltage range
    • 1.7V to 3.6V sensor
    • 2.5V to 3.6V IR LED
  • Temperature range
    • -40°C to +85°C operating
    • -40°C to +100°C storage
  • 100µA to 300µA supply current
  • 1µA (typical) shutdown current
  • 940nm (typical) peak wavelength of IRED
  • 156mA (maximum) IRED driving current
  • Lead-free, halogen-free, and RoHS compliant

With its standard I2C bus serial digital interface, easy access is allowed to the “proximity signal”. The programmable interrupt function offers wake-up functionality for the microcontroller when a proximity change occurs reducing processing overhead by eliminating the need for continuous polling. The implemented infrared emitters cathode is connected to the driver internally and does not need to be externally connected. The IRED features a peak wavelength of 940nm, emits light that reflects off an object to allow detection within 30cm of the sensor, and has a programmable drive current from 50mA to 156mA.

Block Diagram

Vishay Vcnl36821s Ired Integrated Proximity Sensor

Source: Boxer-6641: Delivering More Power for Industrial Computing

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