Pressure Converter
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Ultra Low Pressure Digital Sensor (SM9X3X)

The SM9235 and SM9333/SM9336 are digital, ultra-low pressure MEMS sensors offering state-of-the-art pressure transducer technology and CMOS mixed signal processing technology to produce a digital, fully conditioned, multi-order pressure and temperature compensated sensor in JEDEC standard SOIC-16 package with dual vertical ports. It is available in gauge and differential pressure configurations. The SM9235 device features gauge pressure measurement from 0 Pa to +250 Pa. The SM9333/SM9336 devices feature differential pressure measurement, the SM9333 offers a pressure range of -125 Pa to +125 Pa respectively, the SM9336 offers a pressure range of -250 Pa to +250 Pa. 

Combining the pressure sensor with a signal-conditioning ASIC in a single package simplifies the use of advanced silicon micro-machined pressure sensors. The pressure sensor can be mounted directly on a standard printed circuit board and a high level, calibrated pressure signal can be acquired from the digital interface. This eliminates the need for additional circuitry, such as a compensation network or microcontroller containing a custom correction algorithm.


Please contact SMI Sales for the SM9X3X datasheet.

Key Attributes
Product SeriesSM9X3X
Pressure Range+/-125 Pa, +/- 250 Pa, 0-250 Pa
Pressure TypeGauge,
Comp. Temp. Range-20°C to +85°C
Package TypeSOIC-16
Port TypeDual Vertical
Digital InterfaceI2C, 16 bit
Supply Voltage3.3 V
Typical Accuracy+/-0.5 %FS (+/-125 Pa)
+/-0.3 %FS (+/-250 Pa)
+/-0.6 %FS (0-250 Pa)

Flow and Pressure Measurement in Respiratory Medical Equipment

The movie illustrates the benefits of using the SM9000 Family and the SM6000 Family for air flow control in respiratory medical equipment.