Mobility Solutions

Simplifying development of airbag systems New Bosch acceleration sensors SMA6xy's standardized housing makes design-in more straightforward

  • Greatly improved protection against microcuts
  • Increased design freedom thanks to flexible orientation
  • For use in ASIL D airbag systems in accordance with ISO 26262
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  • March 10, 2014
  • Mobility Solutions
  • Press releases

press release

Bosch's latest generation of acceleration sensors makes developing airbag systems easier. With versions for use in the airbag control unit and versions for peripheral use in the vehicle's front, sides, and rear, the SMA6xy sensor platform simplifies the release approval process by giving sensors a common housing design whatever the application. All the sensors in the new SMA6xy product family are ideally suited to Bosch ASICs for airbag systems.

Better protection against microcuts
The PSI5 sensor for peripheral use comes in versions offering measurement ranges of 120, 240, or 480 g (type SMA68x and SMA69x). In addition to the normal x and y channels, these sensors are now also available with a z channel for measuring acceleration in the vertical axis. So whatever the desired orientation of the sensor's installation, there is a version to match. This gives airbag system developers greater design freedom. Compared to previous versions, the new sensors are much better protected against microcuts – extremely brief interruptions in power supply to the sensor following an impact – and can now tolerate interruptions of up to 10 microseconds.

Designed to be installed in the airbag control unit, the SPI sensors can measure accelerations of up to 120 g (type SMA66x) and their readings have 12-bit resolution. An arming pin helps developers to initiate the airbag algorithm by showing when readings exceed a defined threshold value.

All sensors in the SMA6xy product family have a compact SOIC8n housing and are available in 1-channel (x, y or z axis) or 2-channel (x-y or y-z axes) versions. Since they are designed for use in safety-critical airbag systems, the sensors meet the criteria stipulated for the ASIL D safety level in accordance with ISO 26262.

Samples of the SMA6xy are already available.

Background to MEMS technology
Bosch has been at the forefront of MEMS (microelectromechanical systems) technology since the very beginning. Since the start of production in 1995, the company has manufactured well in excess of three billion MEMS sensors, with production volumes hitting new highs year after year. In 2013, more than a billion sensors rolled off the production lines at the company's Reutlingen plant. The range includes sensors for measuring pressure, acceleration, humidity, temperature, yaw rate, inertia, and geomagnetic field, as well as MEMS microphones for a wide range of applications in the consumer electronics and automotive industries. More information on Bosch sensors is available online at

Readers' contact:
Jochen Volm,
Phone +49 7121 35-6651

Mobility Solutions is the largest Bosch Group business sector. In 2015, its sales came to 41.7 billion euros, or 59 percent of total group sales. This makes the Bosch Group one of the leading automotive suppliers. The Mobility Solutions business sector combines the group’s expertise in three mobility domains – automation, electrification, and connectivity – and offers its customers integrated mobility solutions. Its main areas of activity are injection technology and powertrain peripherals for internal-combustion engines, diverse solutions for powertrain electrification, vehicle safety systems, driver-assistance and automated functions, technology for user-friendly infotainment as well as vehicle-to-vehicle and vehicle-to-infrastructure communication, repair-shop concepts, and technology and services for the automotive aftermarket. Bosch is synonymous with important automotive innovations, such as electronic engine management, the ESP anti-skid system, and common-rail diesel technology.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 375,000 associates worldwide (as of December 31, 2015). The company generated sales of 70.6 billion euros in 2015. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers some 150 countries. The basis for the company’s future growth is its innovative strength. Bosch employs 55,800 associates in research and development at 118 locations across the globe. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

Further information is available online at and,

PI8506 - March 10, 2014

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