SHTxx, STSxx Assembly SMD Pkgs Datasheet by Sensirion AG

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T (max) preheating « hm phase+l . Tlm e SENSIRION YHE sense»: COMPANY re is
www.sensirion.com Version 1 May 2014 1/2
Assembly of SMD Packages
For SHTxx and STSxx Sensirion Humidity and Temperature Sensors
1 Soldering Instructions
For soldering, standard reflow soldering ovens may be
used. The sensors are designed to withstand soldering
profile according to IPC/JEDEC J-STD-020 with peak
temperatures at 260°C during up to 30sec for Pb-free
assembly in IR/Convection reflow ovens (see Figure 1).
Figure 1 Soldering profile according to JEDEC standard. TP
260°C and tP 30sec above 255°C for Pb-free assembly. TL <
220°C and tL < 150sec. Ramp-up rate <3°C and ramp-down rate
< 6°C/sec for temperatures > TL.
The use of “no clean” type 3 solder paste
2
is
recommended. An appropriate amount of solder paste
shall be used, to result in a stand-off height (clearance
between the package body and any part of the substrate)
of 50μm to 75μm. Please consult the appropriate sensor
data sheet for device specific information on the metal
land pattern and recommendations on solder paste
printing stencils.
Sandard pick & place equipment and vacuum nozzles for
standard QFN packages may be used for assembly of
SHTxx and STSxx sensors.
No board wash shall be applied to SHTxx humidity
sensors. Therefore, and as mentioned above, it is strongly
recommended to use “no-clean” solder paste.
For manual soldering contact time must be limited to 5
seconds at up to 350°C.
2
Solder types are related to the solder particle size in the paste: Type 3 covers
the size range of 25 45 µm as specified in IPC J-STD-005A .
Immediately after the exposure to high temperatures
SHTxx humidity sensors may temporarily read a negative
humidity offset (typ. -1 to -2 %RH after reflow soldering).
This offset slowly disappears again by itself when the
sensor is exposed to ambient conditions (typ. within 1-3
days). If RH testing is performed immediately after reflow
soldering, this offset should be considered when defining
the test limits.
It is important to note that the diced edge or side faces of
the I/O pads may oxidise over time, therefore a solder fillet
may or may not form. Hence there is no guarantee for
solder joint fillet heights of any kind.
2 Storage Conditions and Handling
Instructions
It is of great importance to understand that a SHTxx
humidity sensor is not a standard electronic component
and needs to be handled with care. Chemical vapors at
high concentration in combination with long exposure
times may offset the sensor reading.
In manufacturing, transport and operation the sensors
shall be prevented of high concentration of chemical
solvents and long exposure times. Out-gassing of glues,
adhesive tapes and stickers or out-gassing packaging
material such as bubble foils, foams, etc. shall be avoided.
Manufacturing area shall be well ventilated.
For more detailed information please consult the
document “Handling Instructions” or contact Sensirion.
Temperature
Time
tP
TP
TL
TS (max)
tL
preheating
liquid phase
component and some care has to be taken in to ensure
proper and reliable operation of the sensor. This
document contains information on soldering process and
handling of SHTxx and STSxx sensors in a production
environment.
SENSIRION was sense»: COMPANY Dane Version Fage(s) Changes 26. May 2014 1 an Initial version SENSIRION AG Sensirion Inc , USA Sensinon Korea Co Ltd info@sensinon.com www.sensm0n.com Sensinon AG (Germany) phone: +41 44 927 info@sensinon.com www.sensm0n.com phone +1 605 409 49 \nfo us@sensinon.com www.5ensirion com mfo@sensirion cop www.5ensirion 00 9 phone: +62 31 337 info@sensxrion.co.kr www.5ensirion.co.kr info@sensxrion.com cn www.5ensirion.com.cn www.sensmon.comloomac1
www.sensirion.com Version 1 May 2014 2/4
Revision History
Date
Version
Page(s)
Changes
26. May 2014
1
all
Initial version
Copyright © 2014 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: +1 805 409 4900
info_us@sensirion.com
www.sensirion.com
Sensirion Japan Co. Ltd.
phone: +81 3 3444 4940
info@sensirion.co.jp
www.sensirion.co.jp
Sensirion Korea Co. Ltd.
phone: +82 31 337 7700~3
info@sensirion.co.kr
www.sensirion.co.kr
Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info@sensirion.com.cn
www.sensirion.com.cn
Sensirion AG (Germany)
phone: +41 44 927 11 66
info@sensirion.com
www.sensirion.com
To find your local representative, please visit www.sensirion.com/contact

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