SM5291 / SM5391 / SM5491 analog-digital pressure sensor by AMSYS

SM5291 / SM5391 / SM5491 analog-digital pressure sensor

SM5291 / SM5391 / SM5491

The SOIC pressure sensors in the SM5X91 series are analog/digital OEM sensors* with a new silicon sensing element and modern electronic signal conditioning unit. The integrated digital signal processor permits calibration and temperature compensation during production.

The fully calibrated SM5291/SM5391/SM5491 sensors are supplied in a standard SOIC16 package with two vertical pressure connectors for SMD assembly. Pressure-proportional information in I2C format or as an analog 0.5 – 4.5 V voltage signal acts as an output signal. SM5291/SM5391/SM5491 are autonomous sensors which do not require any additional circuitry.

SM5291/SM5391/SM5491 are suitable for reflow soldering and automatic assembly on a PCB.

The sensor is available in a relative SM5291 or differential SM5391 sensor version or as asymmetrical, bidirectional, differential pressure sensor SM5491.

Variants of SM5291/SM5391/SM5491

SM5291 relative pressure ranges: 0 – 0.8 / 2.49 psi

SM5391 differential pressure ranges:
P1: -2.49 – 0.8 psi and P2: 0.8 – 2.49 psi (the absolute values of P1 and P2 must be identical. Please see the datasheet.)

SM5491 bidirectional, asymmetrical pressure ranges:
P1: -2.49 – 0.8 psi and P2: -0.8 – 2.49 psi (the absolute values of P1 and P2 may differ from one another. The difference between P1 and P2 must be greater than 0.8 psi, however. Please see the datasheet.)

Link to the pressure converter

AMSYS provides the SOIC sensors in the SM5X91 series as standard versions. The following specifications thereof can be customized, however.


  • Relative, differential and asymmetrical, bidirectional pressure: ±2.49 psi
  • Compensated temperature range: -40 – 105°C
  • Supply voltage: 3.3 V/5 V
  • Calibrated digital output signal in I²C format
  • Calibrated analog voltage signal
  • Resolution of 16 bits
  • Accuracy: ±1% FS digital, ±1.5% analog
  • Digital ASIC signal processor
  • SOIC16 package for SMD assembly
  • ISO & ISO/TS certified
  • RoHS and REACH compliant


  • Respiratory control
  • Devices for negative pressure wound therapy
  • HVAC
  • Fan control
  • Gas flows
  • Airstream measurement

For information on prices and delivery times or if you have any technical questions, please contact