Data Sheet

Final Datasheet
BME280 Environmental sensor
Page 48
BST-BME280-DS001-10 | Revision 1.1 | May 2015 Bosch Sensortec
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third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
7.11 Mounting and assembly recommendations
In order to achieve the specified performance for you design, the following recommendations
       BME2    
consideration when mounting a pressure sensor on a printed-circuit board (PCB):
 The clearance above the metal lid shall be 0.1mm at minimum.
 For the device housing appropriate venting needs to be provided in case the ambient
pressure shall be measured.
 Liquids shall not come into direct contact with the device.
 During operation the sensor chip is sensitive to light, which can influence the accuracy of
the measurement (photo-current of silicon). The position of the vent hole minimizes the
light exposure of the sensor chip. Nevertheless, Bosch Sensortec recommends avoiding
the exposure of BME280 to strong light sources.
 Soldering may not be done using vapor phase processes since the sensor will be
damaged by the liquids used in these processes.
7.12 Environmental safety
7.12.1 RoHS
The BME280 sensor meets the requirements of the EC restriction of hazardous substances
(RoHS) directive, see also:
Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on
the restriction of the use of certain hazardous substances in electrical and electronic
equipment.
7.12.2 Halogen content
The BME280 is halogen-free. For more details on the analysis results please contact your
Bosch Sensortec representative.
7.12.3 Internal package structure
roducts and secure the mass
product supply, Bosch Sensortec qualifies additional sources (e.g. 2
nd
source) for the package
of the BME280.
While Bosch Sensortec took care that all of the technical packages parameters are described
above are 100% identical for all sources, there can be differences in the chemical content and
the internal structural between the different package sources.
However, as secured by the extensive product qualification process of Bosch Sensortec, this
has no impact to the usage or to the quality of the BME280 product.