SHTxx Handling Instructions Datasheet by Sensirion AG

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www.sensirion.com Rev. 5 – March 2018 1/7
Handling Instructions
For SHTxx Humidity and Temperature Sensors
Applicability
This document is applicable to all Sensirion SHTxx
humidity and temperature sensors.
ESD protection
The sensor shall be protected from ESD (Electrostatic
Discharge) and only be handled in ESD protected areas
(EPA) under protected and controlled conditions (ground
all personnel with wrist-straps, ground all non-insulating
and conductive objects, exclude insulating materials
from the EPA, operate only in grounded conductive floor,
etc.). Protect sensor outside the EPA using ESD
protective packaging.
Protection against ESD is mandatory.
Exposure to Chemicals
Humidity and Temperature sensors are highly accurate
environmental sensors and as such they are not ordinary
electronic components. The opening in the package
exposes the sensor to the environment and makes it
susceptible to pollutants. While applying sensors in the
field in ambient environment is not critical, pollutants are
known to occur in manufacturing environments and
during storage. Please carefully follow the guidelines in
this application note to ensure that you can benefit of the
sensor’s outstanding performance.
The sensor shall not get in close contact with volatile
chemicals such as solvents or other organic compounds.
Especially high concentration and long exposure must
be avoided. Ketenes, Acetone, Ethanol, Isopropyl
Alcohol, Toluene, etc. are known to cause drift of the
humidity reading – irreversibly in most of the cases.
Please note that such chemicals are integral part of
epoxies, glues, adhesives, etc. and outgas during baking
and curing. These chemicals are also added as
plasticisers into plastics, used for packaging materials,
and do out-gas for some period.
Acids and bases may affect the sensor irreversibly and
shall be avoided: HCl, H2SO4, HNO3, NH3 etc. Also
Ozone in high concentration or H2O2 have the same
effect and therefore shall be avoided. Please note, that
above examples represent no complete list of harmful
substances.
The sensor shall not get in contact with cleaning agents
(e.g. PCB board wash after soldering) or strong air blasts
from an air-pistol (not oil-free air). Applying cleaning
agents to the sensor may lead to drift of the reading or
complete breakdown of the sensor.
Ensure good ventilation (fresh air supply) to avoid high
concentrations of volatile chemicals (solvents, e.g.
ethanol, isopropanol, methanol, acetone, cleaning
solutions, detergents…).
Packing and Storage
Prior to assembly or use of the sensors it is strongly
recommended to store the sensors in the original sealed
ESD bag at following conditions: Temperature shall be in
the range of 10°C – 50°C (0 – 125°C for limited time)
Preface
Sensirion SHTxx are relative humidity and temperature
sensors of high quality. For taking advantage of their
outstanding performance some precautions must be
taken during storage, assembly and packaging.
Therefore, please read the following instructions carefully
- preferably during design-in phase and before
production release of the respective device. Special
attention is required regarding the exposure to volatile
organic compounds, i.e. high concentration and long
exposure time to respective gases shall be avoided.
Such conditions are known to occur in manufacturing
environment and/or during storage. Therefore, proper
handling and choice of materials are crucial. Applying
sensors in the field in ambient environment is not critical.
e sensors have been removed we recommend to store the devlces wih assemble c shielded ESD bags ended not to use any reseal the sensor bag Slroebel "Topshield" Bags SENSIRION YHE senson COMPANY mu; "V3.92" 2 131* SENSIRION soldering older cycle. This It is imponanl lh no board wash
SHTxx Handling Instructions
www.sensirion.com Rev. 5 – March 2018 2/7
and humidity at 20 – 60%RH (sensors that are not stored
in ESD bags).
Store sensors in original, unopened ESD bag. Place
additional stickers only on the outside of the ESD
bag.
Once sensors have been removed from the original ESD
bag we recommend to store the individual sensors as
well as devices with assembled sensors in metal-in
antistatic shielded ESD bags. In particular, it is
recommended not to use any adhesive or adhesive
tapes to reseal the sensor bag after opening. Following
ESD Bags can be recommended (no polluting effect on
humidity sensor):
ESD Bag
Manufacturer
Product
Stroebel
"Topshield" Bags
Sensors as a component or mounted into the final
product shall not be packaged in outgassing plastic
materials which could cause sensor pollution. Besides
metal-in antistatic shielded ESD bags, paper or
cardboards based packaging, deep drawn plastic trays
(PE, PET, PP) may be considered. Do not use antistatic
polyethylene bags (light blue, pink or rose color); be very
careful with bubble foils and foams.
Be careful about stickers present inside the packing (e.g.
on the housing of the device). Sticker size should be kept
to a minimum, and the sticky side shall fully adhere onto
a surface.
Please note that many packaging materials may be
provided with additives (plasticizers) which may have a
polluting effect on the sensor. Generally speaking, if a
material emits a strong odor you should not use it.
Additives may also be added to materials which are
listed for recommended use. For high safety, device
housing and shipment packaging must be qualified.
Such a qualification test may contain exposure of the
final device with sensor in its shipment packaging to
temperature ≥65°C for at least 168 hours. (If shipping or
storage conditions are expected to be harsh, the
qualification test conditions for the packing material have
to be customized.) The sensor reading then shall show
no changed deviation against a reference compared to
same measurements before the exposure.
Do not use polyethylene antistatic bags (light blue,
pink or rose color). Do not use adhesive tapes inside
packaging.
For guidance on simple and straight-forward testing of
humidity sensors please consult the Testing Guide for
humidity sensors.
Assembly
Sensors in SMT packages are classified as Moisture
Sensitivity Level 1 (IPC/JEDEC J-STD-020). It is
recommended to process the sensors within 1 year after
date of delivery.
Before developing the assembly process please read the
User’s Guide of the Datasheets carefully. In the
following, crucial items are underlined plus additional
items are given:
For soldering please read carefully the application note
“Assembly of SMD Packages”. Make sure that maximum
temperatures and exposure times are respected. In case
the PCB passes through multiple solder cycles (as is the
case for e.g. PCB that are assembled on top and bottom
side), it is recommended to assemble the SHTxx only in
the last solder cycle. This is to reduce risks of sensor
pollution. It is important that “no-clean” solder paste is
used and no board wash is applied once the sensor is
assembled to the PCB.
SHT31 – 500pcs
No mechanical force SENSIRION THE sensor: COMPANY Perers Elpeguard Si. 1301 ECO-FLZ Dow Corning 1-2577 Low Voc Conformal Coating Electrolube AFA (Aromatic Free Acrylic Conformal corrosive environment conformal coatlnqs rpoltinq materials spray coating Iechnigues 3M Elemrical Tape 92 adhesive tages
SHTxx Handling Instructions
www.sensirion.com Rev. 5 – March 2018 3/7
Do not apply board wash.
No mechanical force shall be applied to any part of the
sensor during assembly or usage.
For application in corrosive environment – such as
condensed water or corrosive gases – it may be
necessary to protect the electronic assembly including
the soldered contacts of the sensor with a passivation.
Such passivation may be achieved by conformal coating
or by applying adhesive.
Low viscose conformal coatings or potting materials may
flow into the inside the sensor cap, cover the sensor
element and thus make the humidity sensor inoperative.
Use only high viscose conformal coatings or potting
materials, or seal the interface between sensor cap and
sensor PCB before applying conformal coating. Ensure
good ventilation throughout the application, staging and
curing to prevent sensor pollution.
If conformal coating is applied, the top surface of the
sensor must remain free of coating.
In any case, covering the humidity sensor opening with
any kind of coating must be avoided. Therefore, the top
surface of the sensor should remain free of coating.
The following table lists conformal coatings which have
been tested regarding pollution of the humidity sensor
and are known to be suitable if applied and fully cured
under good ventilation (fresh air supply) and according
to respective datasheet.
Conformal Coatings
Manufacturer
Product
Peters
Elpeguard SL 1301 ECO-FLZ
Dow Corning
1-2577 Low Voc Conformal Coating
Electrolube
AFA (Aromatic Free Acrylic Conformal
Coating)
Do not apply spray to unprotected sensor.
Whenever using spray coating techniques (e.g. to apply
varnish or conformal coating, etc.) the SHT3x with
protective cover option can be used or the SHTxx sensor
has to be covered by the adhesive tape to prevent
coating of the humidity sensor opening. The following
table lists adhesive tapes which have been tested
regarding pollution of the humidity sensor and are known
to be suitable.
Adhesive Tapes
Manufacturer
Product
3M
Electrical Tape 92
Do not apply any other adhesive tapes such as Scotch
Tape, Sello Tape, Tesa Film, etc.
XXX
SENSIRION THE sewson (DMF'ANV ¢ Peters vu 4457-61 adhesives and encapsulants Be par using strong cleaning agents ohms an EFO-TEK H70E/S J EFO-TEK T6067 EFO-TEK 93-86 Lord MD-130 Eccobond E35034 Ablebcnd 64-3 Slycasl 50300 I 50400 series Hysol E01061/E01062 RTV 6424 (Momemive) Dow Cormng 732 Slycasl S 7503 Loctile 401
SHTxx Handling Instructions
www.sensirion.com Rev. 5 – March 2018 4/7
In conjunction with the sensor, use only
recommended Kapton® tape Electrical Tape 92 by
3M™.
Regarding adhesives and encapsulants the material in
the following tables may be used – according to
respective datasheets, applied and fully cured in well
ventilated environment (fresh air supply). Materials and
brands not listed in the following tables may be harmful
and shall be tested carefully before applying.
Epoxy Adhesives
Manufacturer
Product
EPO-TEK
H70E/S
EPO-TEK
T6067
EPO-TEK
93-86
Lord
MD-130
Eccobond
E3503-1
Ablebond
84-3
Epoxy Glob Top Encapsulants
Manufacturer
Product
Stycast
50300 / 50400 series
Hysol
EO1061/EO1062
Silicone Adhesives
Manufacturer
Product
RTV
6424 (Momentive)
Dow Corning
732
Silicone Glob Top Encapsulants
Manufacturer
Product
Stycast
S 7503
Instant Adhesives
Manufacturer
Product
Loctite
401
PUR (Polyutherane) Casting Compounds
Manufacturer
Product
Peters
VU 4457-61
Hot melts may absorb water and thus may have an
impact on the response time of the sensor in the device.
Therefore, hot melt shall be applied sparingly.
The sensor shall be mounted into the device, if possible,
after all materials that are used in the assembly process
have completely cured or dried out. Otherwise ensure
good ventilation (fresh air supply) in curing ovens and
assembly lines.
Prevent any dust or particles from entering the sensor
opening (sensor performance may be affected).
Wear clean gloves or finger cots while handling the
sensor and avoid touching the sensor opening.
Ensure recommendations in this application note are
equally considered during repair and rework of
assemblies containing sensors. During repair and
rework it may be recommendable to cover the sensor
with Kapton tape (specific recommendation see above).
Be particularly careful when using strong cleaning
agents (e.g. detergents, alcohols, brominated or
fluorinated solvents). Cleaning any part of a product
might lead to high concentration of cleaning agents on
the sensor. Please remove any sensors or devices
containing sensors before cleaning the production area
and tools. Ensure good ventilation (fresh air supply) and
that any solvents have evaporated before resuming
production.
Prevent sensor from exposure to cleaning agents.
SENSIRION YHE season COMPANY clean air — gualification for use in harsh environment is duty of the user of the sensor For exposure to extreme humidity and temgerature volatile organic comgounds acids or bases Corrosive substances
SHTxx Handling Instructions
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Application in extreme environment
Some applications require the exposure of humidity and
temperature sensors to harsh environments. In many of
the cases the sensor is uncritical to be used. However,
some precautions must be taken.
For exposure to extreme conditions with regards to
humidity and temperature please consult the datasheet
of respective product. Please make sure that exposure
time of the sensor to maximum range of operating
conditions is limited as given in datasheet. Exposure to
volatile organic compounds at high concentration and
long exposure time is critical not only in assembly but
also in the field. Such application needs to be carefully
tested and qualified.
Exposure to acids or bases may be critical, too. In order
to be critical, the concentration must be such that
polymers are attacked. For bases there is a rule of thumb
that pH<9 are uncritical. Etching substances such as
H2O2, NH3, etc. at high concentrations are critical to the
sensor, too.
Corrosive substances at very low concentrations are not
critical to the sensor itself. However, they may attack the
solder contacts. Therefore, the contacts must be well
protected (passivated) in case of an application to such
environment – compare also Section “Assembly”.
Application of Sensirion humidity and temperature
sensors to harsh environment must be carefully tested
and qualified. Sensirion qualifies its humidity and
temperature sensors to work properly within ambient
clean air – qualification for use in harsh environment is
duty of the user of the sensor.
Reconditioning Procedure
As stated above extreme conditions or exposure to
solvent vapors may offset the sensor. The following
reconditioning procedure may bring the sensor back to
calibration state:
Baking: 100 – 105°C at < 5%RH for 10h
Re-Hydration: 20 – 30°C at ~ 75%RH for 12h
1
.
Disclaimer
The above given restrictions, recommendations,
materials, etc. do not cover all possible cases and items.
The material recommendations are given with regard to
pollution of SHTxx sensors and assume optimal
processing for avoiding VOC in process – the materials
were not tested regarding other properties like reliability,
performance, usability or mechanical properties. The
material recommendations have been compiled with our
best knowledge at the time of writing. Manufacturers may
change the compounds without notice, which can lead to
reduced Sensor performance due to outgassing.
This document is not to be considered complete and is
subject to change without prior notice.
1
75%RH can conveniently be generated with saturated NaCl solution.
SENSIRION was sensor: COMPANY Date Revision Changes 29 June 2007 0.1 (Preliminary) Initial revision 7 January 2009 1.0 Complete rework. 18 March 2010 1.1 New formal, implementation of pictograms. 28 June 2012 2.0 Moisture Sensitivity Level adapted. 18 November 2013 3 Document partially restructured and clarifications added. 22. May 2014 4 ESD bag recommendation changed, reconditioning procedure added 12. March 2018 5 ESD bag recommendation changed, Piclograms updated, conformal
SHTxx Handling Instructions
www.sensirion.com Rev. 5 – March 2018 6/7
Revision History
Date
Revision
Changes
29 June 2007
0.1 (Preliminary)
Initial revision
7 January 2009
1.0
Complete rework.
18 March 2010
1.1
New format, implementation of pictograms.
28 June 2012
2.0
Moisture Sensitivity Level adapted.
18 November 2013
3
Document partially restructured and clarifications added.
22. May 2014
4
ESD bag recommendation changed, reconditioning procedure added
12. March 2018
5
ESD bag recommendation changed, Pictograms updated, conformal
coating added
SENSIRION AG fax: +41 44 306 info@sensinon.com www 9ensm0n.com Sensirion Taiwan Co. Lxd. info@sensirion.oom SENSIRION YHE senson COMPANY Sensxrion \nc. USA Sensinon Korea Co. Ltd. phone: +1 312 690 585 phone: +82 31 337 77 mfcrus@sensiricn.com info-kr@sensiricn.com www.5ensirion com www.5ensirion.co.kr phone: +81 3 3444 4 phone: +86 755 8252 mfcr'p@sensirion com info-en@sensirion.com www.5ensirion 0032 www.5ensirion.com cn/ To find your ma‘ represenmwe, please visxt www sensinon.com/con1acl
SHTxx Handling Instructions
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Important Notices
Warning, Personal Injury
Do not use this product as safety or emergency stop devices
or in any other application where failure of the product could
result in personal injury. Do not use this product for
applications other than its intended and authorized use.
Before installing, handling, using or servicing this product,
please consult the data sheet and application notes. Failure
to comply with these instructions could result in death or
serious injury.
If the Buyer shall purchase or use SENSIRION products for any
unintended or unauthorized application, Buyer shall defend,
indemnify and hold harmless SENSIRION and its officers,
employees, subsidiaries, affiliates and distributors against all
claims, costs, damages and expenses, and reasonable attorney
fees arising out of, directly or indirectly, any claim of personal
injury or death associated with such unintended or unauthorized
use, even if SENSIRION shall be allegedly negligent with respect
to the design or the manufacture of the product.
ESD Precautions
The inherent design of this component causes it to be sensitive
to electrostatic discharge (ESD). To prevent ESD-induced
damage and/or degradation, take customary and statutory ESD
precautions when handling this product.
See application note “ESD, Latchup and EMC” for more
information.
Warranty
SENSIRION warrants solely to the original purchaser of this
product for a period of 12 months (one year) from the date of
delivery that this product shall be of the quality, material and
workmanship defined in SENSIRION’s published specifications
of the product. Within such period, if proven to be defective,
SENSIRION shall repair and/or replace this product, in
SENSIRION’s discretion, free of charge to the Buyer, provided
that:
notice in writing describing the defects shall be given to
SENSIRION within fourteen (14) days after their
appearance;
such defects shall be found, to SENSIRION’s reasonable
satisfaction, to have arisen from SENSIRION’s faulty
design, material, or workmanship;
the defective product shall be returned to SENSIRION’s
factory at the Buyer’s expense; and
the warranty period for any repaired or replaced product
shall be limited to the unexpired portion of the original
period.
This warranty does not apply to any equipment which has not
been installed and used within the specifications recommended
by SENSIRION for the intended and proper use of the
equipment. EXCEPT FOR THE WARRANTIES EXPRESSLY
SET FORTH HEREIN, SENSIRION MAKES NO WARRANTIES,
EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THE
PRODUCT. ANY AND ALL WARRANTIES, INCLUDING
WITHOUT LIMITATION, WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED.
SENSIRION is only liable for defects of this product arising under
the conditions of operation provided for in the data sheet and
proper use of the goods. SENSIRION explicitly disclaims all
warranties, express or implied, for any period during which the
goods are operated or stored not in accordance with the technical
specifications.
SENSIRION does not assume any liability arising out of any
application or use of any product or circuit and specifically
disclaims any and all liability, including without limitation
consequential or incidental damages. All operating parameters,
including without limitation recommended parameters, must be
validated for each customer’s applications by customer’s
technical experts. Recommended parameters can and do vary in
different applications.
SENSIRION reserves the right, without further notice, (i) to
change the product specifications and/or the information in this
document and (ii) to improve reliability, functions and design of
this product.
Copyright © 2018, by SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
Headquarters and Subsidiaries
SENSIRION AG
Laubisruetistr. 50
CH-8712 Staefa ZH
Switzerland
phone: +41 44 306 40 00
fax: +41 44 306 40 30
info@sensirion.com
www.sensirion.com
Sensirion Inc. USA
phone: +1 312 690 5858
info-us@sensirion.com
www.sensirion.com
Sensirion Japan Co. Ltd.
phone: +81 3 3444 4940
info-jp@sensirion.com
www.sensirion.co.jp
Sensirion Korea Co. Ltd.
phone: +82 31 337 7700~3
info-kr@sensirion.com
www.sensirion.co.kr
Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info-cn@sensirion.com
www.sensirion.com.cn/
Sensirion Taiwan Co. Ltd.
phone: +41 44 306 40 00
info@sensirion.com
To find your local representative, please visit www.sensirion.com/contact

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