Pressure sensors: Miniaturised sensor dies for automotive and IoT applications
Published: 12 October 2017 - Sarah Mead
TDK Corporation presents new miniaturised EPCOS MEMS pressure sensor dies. The automotive versions of the C33 series boast dimensions of just 1mm x 1mm x 0.4mm, making them one of the smallest of their kind*. They are designed for absolute pressures of 1.2 bar to 10 bar, and are qualified based on AEC-Q101.
The typical operating voltage is 3 V. With a supply voltage of 5 V they offer sensitivities of between 15 mV/bar and 80 mV/bar, depending on the type. The miniaturised pressure sensors are suitable for a temperature range from -40 °C to +135 °C and can even withstand 140 °C for short periods. They also offer a very long-term stability of ± 0.35% FS (full scale).
The C39 type, with its footprint of just 0.65 mm x 0.65 mm is especially suitable for IoT and consumer applications. One noteworthy feature of the C39 is its low insertion height of just 0.24 mm, which makes the low-profile MEMS pressure sensor die ideal for applications in smartphones and wearables, for example, where space requirements are critical. The C39 is designed for an absolute pressure of 1.2 bar and, like the C33 series, offers long-term stability of ± 0.35% FS. All the pressure sensor dies operate on the piezoresistive principle and deliver, via a Wheatstone bridge, an analog signal that is proportional to the applied pressure and the supply voltage.
* Status: September 2017 according to EPCOS market research
Main features and benefits
Compact dimensions of just 1 mm x 1 mm x 0.4 mm, and 0.65 mm x 0.65 mm x 0.24 mm, respectively
Very long-term stability of ± 0.35% FS
Automotive types qualified based on AEC-Q101
You can find further information on the products at www.epcos.com/pressure_sensor_elements