New filter membrane cover option for SHT3x humidity sensors

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 vapor 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. More details on contamination can be found in the document ‘Handling Instructions for Humidity Sensors’, downloadable from our website: www.sensirion.com/humidity-download. All SHT3x sensors can be ordered in tape and reel packaging; the reels are delivered in sealed antistatic ESD bags.

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.

For more information on our SHT3x humidity sensors, please visit: www.sensirion.com

About Sensirion AG

Sensirion AG, headquartered in Staefa, Switzerland, is the world's leading manufacturer of digital microsensors and systems. The product range includes humidity and temperature sensors, mass flow controllers, gas and liquid flow sensors, and differ-ential pressure sensors. An international network with sales offices in the USA, Germany, China, Taiwan, Japan and Korea supplies international OEM customers with tailor-made sensor system solutions for a vast range of applications. Among other things, these include analytical instruments, consumer goods and automobiles, as well as the medical and HVAC industries. One of the hallmark features of Sensirion products is the use of patented CMOSens® Technology. CMOS-based sensor elements and systems permit intelligent system integration, including calibration and a digital interface. Sensirion's credentials as a reliable OEM supplier are underscored by its ISO/TS 16949 certification.