Sensirion, the world’s leading manufacturer of humidity, temperature and flow sensor solutions, now offers an on-package filter membrane option for selected humidity sensors in the SHT3x series.
The SHT3x membrane is an PTFE film that protects the sensor opening from water and dust according to IP67. It thus allows sensor use under harsh environmental conditions, where spray water and high exposure to dust is challenging for accurate sensor performance. The membrane cover is attached to the sensor package by a double-faced adhesive tape, which is designed to stay on the package over the lifetime of the sensor. The whole package withstands multiple reflow cycles.
Due to minimal package volume and the membrane’s high water vapour permeability, the response time of the relative humidity and temperature signal is identical to the value achieved by the uncovered sensor. Although the membrane option provides perfect protection against water and dust ingress according to IP67, it does not in general prevent contamination from volatile chemicals.
All humidity sensors in the SHT3x series feature increased intelligence and reliability. Their functionality includes enhanced signal processing, two distinctive and user-selectable I2C addresses and communication speeds of up to 1 MHz. The DFN package can be integrated into a broad variety of applications, thanks to its footprint of 2.5 x 2.5 x 0.9 mm3 and the wide supply voltage range of 2.4 V to 5.5 V. As with all Sensirion sensors, the SHT3x is based on the unique CMOSens® Technology, which integrates the sensing element and read-out electronics on a single chip, enabling high production volume at an exceptional price-performance ratio.