Datasheet Membrane Option For SHT3x Humidity and Temperature Sensors Protects the sensor from water and dust according to IP67 Allows for sensor use under harsh environmental conditions Withstands multiple standard reflow cycles Lasts over total sensor life time Delivered in T&R Packaging On-package membrane protected by exclusive 1 license for several patents Product Summary The SHT3x membrane is a PTFE foil, dedicated to is designed to stay on the package over the whole protect the sensor opening from water and dust sensor life time. Due to the minimum enclosed air according to IP67. It will thus allow for sensor use under volume, the response time of the RH signal is the same harsh environmental conditions, where spray water and as the value achieved by the uncovered sensor. high exposure to dust is challenging for accurate sensor Sensirion holds an exclusive license for several patents performance. The membrane cover is attached to the for employing an on-package filter membrane on a 1 sensor package by a double faced adhesive tape, which humidity sensor . Datasheet: Intention of Use This datasheet is meant to provide all relevant together with their respective order number. Any further specifications for the additional membrane option of the information about sensor performance, RH&T-sensors of type SHT3x. All SHT3x products communication protocols etc. are to be found in the coming with the membrane option are listed in Table 1, respective main datasheets, only. document SHTxx handling instructions also apply to 1 General information sensors with the membrane option. The SHT3x membrane is an optional PTFE foil, directly 2 Specifications of the Membrane attached to the top surface of the sensor. It is attached to the sensor via a double faced adhesive tape, designed The PTFE membrane has a thickness of 100m, offering to last over the whole sensor life time. The membrane a filtration efficiency of >99.99% for particles of 200nm completely covers the sensor opening and thus acts as size. It is attached to the DFN package via a Polyester a reliable shield against pollution from spray water and (PET) film supported double coated silicone adhesive dust, classified IP67. The whole package withstands tape with a nominal thickness of 100m. The PET film multiple reflow cycles. has a hole in the middle to allow free air exchange Although the membrane provides water and dust between the environment and the sensor opening. protection according to IP67, it does not in general Due to the small dead volume between sensor surface prevent from contamination with volatile chemicals. and membrane layer and the high permeability of the Detailed handling and storage instructions in the membrane, the response time of the RH sensor stays within the specification of the sensor without membrane. 1 EP 1810013 B1 US 7,741,950 CN 101040181 B www.sensirion.com August 2019 - Version 3 1/4 Datasheet Membrane Option 3 Technical Drawing 0.2 0.2 2.2 0.9 2.5 Figure 1 Dimensional drawing of SHT3x membrane sensor package. Pin 1 is indicated through the cut corner of the membrane. 4 Shipping Package 1.5 +.1 /-0.0 4.00 2.00 .05 SEE Note 2 1.00 MIN 4.00 SEE Note 1 1.75 .1 00..3300 .05 .05 A 5.50 .05 R 0.2 MAX. SEE NOTE 2 B 0 B 12.0 +0.3/-0.1 A K R 0.25 TYP. 0 A 0 A = 2.75 0 B = 2.75 0 SECTION A - A K = 1.20 0 TOLERANCES - UNLESS NOTED 1PL .2 2PL .10 NOTES: 1. 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE 0.2 DETAIL B 2. POCKET POSITION RELATIVE TO SPROCKET HOLE MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE 3. A0 AND B0 ARE CALCULATED ON A PLANE AT A DISTANCE ABOVE THE BOTTOM OF THE POCKET Figure 2 Technical drawing of the packaging tape with sensor orientation in tape. Header tape is to the right and trailer tape to the left on this drawing. Dimensions are given in millimeters. www.sensirion.com August 2019 - Version 3 2/4 2.5 2.2