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Datasheet Protective Cover Option
For SHT3x Humidity and Temperature Sensors
Protects the sensor against pollution during
assembly processes
Enables cost-effective brush-over and spray-over
conformal coating procedures
Withstands multiple standard reflow cycles
Removable with tweezers at end-of-line
Delivered in T&R packaging
Product Summary
The SHT3x protective cover is a polyimide foil, dedicated
to protect the sensor opening from pollution. The sensor
is delivered with the protective cover attached such that
the sensor opening is completely covered and sealed.
This enables cost-effective brush-over and spray-over
application procedures of conformal coating material.
The protective cover can be easily removed with
tweezers at the end of the assembly process to allow for
proper sensor operation.
Datasheet: Intention of Use
This datasheet is meant to provide all relevant
specifications for the additional protective cover option of
the RH&T-sensors of type SHT3x. All SHT3x products
coming with the protective cover option are listed
in Table 1, together with their respective order number.
Any further information about sensor performance,
communication protocols etc. are to be found in the
respective main datasheets, only.
1 General information
The SHT3x protective cover is an optional polyimide foil,
directly attached to the top surface of the sensor. It
covers the complete sensing area of the SHT3x and thus
acts as a reliable shield against pollution during SMT
assembly of the sensor and subsequent processes such
as conformal coating or potting. The protective cover is
designed to withstand multiple reflow cycles. After
assembly and for proper operation of the sensor the
cover tape must be removed.
The cover features a flap that extends over the outside
dimension of the sensor package on one side. This flap
is designed to allow the cover to be peeled off easily by
using tweezers. After peel-off the sensor will operate
regularly as specified in the respective datasheet.
All typical application procedures such as brushing,
spraying or potting can be used as long as the protective
cover is attached. The cover will effectively protect the
sensor opening from direct exposure to these coatings
and other possible pollutants during production process.
However, the cover does not protect sensor
contamination by volatile chemicals resulting from
outgassing or curing of the conformal coating. Sensirion
recommends to cure conformal coatings according to
supplier specifications (temperature und timing) and to
provide for increased ventilation. Further extended
curing times will additionally reduce the risk of
contamination. More details on contamination and a list
of suitable conformal coatings can be found in the
document “SHTxx Handling Instructions”, downloadable
from our website.
As the cover flap extends over one side of the sensor,
please keep in mind that the underneath area of the PCB
will not be coated. The relevant dimensions are sketched
in Figure 1 which will help proper PCB design. The two
metallic contacts which are in the side wall of the sensor
and lay under the protective cover do not need conformal
coating, as they are electrically grounded.
Datasheet Protective Cover Option
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Handling and storage recommendations in the “SHTxx
handling instructions” document also apply to sensors
with the protective cover option.
After reflow soldering the sensor will need a
reconditioning procedure if immediate functional testing
is desired. Details on the reconditioning steps are listed
in “SHTxx handling instructions”.
2 Ordering Information
The SHT3x protective cover can be ordered in tape and
reel packaging in different reel sizes given in Table 1.
The reels are delivered in sealed ESD bags.
Name
Quantity
Order Number
SHT30-DIS-P10kS
10’000
1-101326-01
SHT31-DIS-P10kS
10’000
1-101472-01
SHT30-LSS-P10kS
10’000
1-101342-01
Table 1 SHT3x protective cover ordering options.
3 Technical Drawing
Figure 1 Dimensional drawing of SHT3x protective cover
sensor package. Pin 1 is indicated through the cut corner
of the flap.
4 Land Pattern
For recommended metal land pattern please refer to the respective SHT3x data sheet. In case conformal coating is used,
it is not recommended to place components or open metal surfaces on the PCB underneath the extension flap of the
protective cover because this area will not be coated properly.
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5 Shipping Package
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.
6 Quality
6.1 Material Contents
The device is fully RoHS and WEEE compliant, e.g. free
of Pb, Cd, and Hg.
Revision History
Date
Version
Page(s)
Changes
3. July 2015
1
all
Initial release
February 2016
2
all
Update on use and applicability of protective cover;
New available products
Datasheet Protective Cover Option
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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 © 2016, by SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved
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