High-accuracy digital differential pressure sensor optimized for airspeed readings up to 180 km/h.
Achieve outstanding airspeed accuracy with the SDP33 Airspeed. A tiny form factor, differential, high-performance pressure sensor based on the Sensirion SDP33.
➤ High-Accuracy (16 bit ADC). ➤ Differential inputs, ideal for Pitot tubes. ➤ ±1500 Pa pressure range (Max speed: 50m/s or ~180Km/h)
Ideal for unmanned aerial vehicles, drones, fixed-wings, robotics.
The SDP33 is one of the smallest differential pressure sensors on the market, belonging to Sensirion’s tiny SDP3x sensor series.
Unlike standard piezoresistive pressure sensors that suffer from thermal drift and calibration offset issues at low pressures, the SDP33 uses a thermal CMOSens® flow channel to measure microscopic pressure differentials with phenomenal repeatability.
Whether you're building a Pitot tube airspeed system for an autonomous fixed-wing or VTOL drone, constructing an automated medical spirometer, or building an ultra-sensitive HVAC clogged-filter detector, the SDP33 gives you clean 16-bit pressure data over I²C without needing software-side zero calibration.
The SDP33 Airspeed is a bidirectional sensor capable of measuring positive and negative differential pressure without hardware damage. While swapped tubing will not harm the sensor, connecting the dynamic port to static air will output a negative pressure value, causing your autopilot to report 0 m/s airspeed.
Important: Ensure the dynamic (Pitot) tube is routed to Port 2 (+) and the static tube to Port 1 (-), or adjust your flight controller's tube orientation settings in software before flight.
Technical
Feature
Siderion SDP33
Pressure Range
±1500 Pa (±15 mbar)
Max Speed
~180 km/h (~50 m/s)
Sensitivity
16-bit ADC
Accuracy
3% of reading (-500 to +500 Pa)
Maximum ODR (continuous mode)
~2000 Hz
Maximum ODR (triggered mode)
~20 Hz
Peak Supply Current
5.5 mA
Interface
I2C - JST-GH 1.25mm 4P
Size
26 x 17 x 8 mm
Weight
4 g
Reasons to choose the SDP33 Airspeed
For small-to-medium UAVs, gliders, and light fixed-wing platforms, conventional pressure sensors often struggle to register minute airflow changes at low flight speeds.
The Siderion SDP33 leverages Sensirion’s microthermal CMOSens® technology to deliver unparalleled low-speed sensitivity, ultra-fast refresh rates, and zero zero-point drift.
Exceptional Sensitivity at Low Airspeeds Unlike traditional piezo-resistive diaphragm sensors that lose accuracy near zero, the SDP33 measures actual mass flow through a tiny internal channel. This thermal micro-flow architecture provides accurate, noise-free differential pressure readings down to fractions of a Pascal, making it ideal for high-precision low-speed approaches, hand-launched drones, and thermal soaring.
High-Speed 2 kHz Update Rate With a maximum output data rate of up to 2000 Hz and response times as fast as 1 ms, the SDP33 gives autopilot controllers near-instantaneous airspeed feedback. This extreme refresh rate allows control loops in PX4 and ArduPilot to detect gusts, wind shears, and turbulent stall conditions significantly faster than standard digital sensors.
Absolute Zero-Point Stability (No Drift) Sensirion’s thermal measurement principle guarantees zero offset drift and excellent thermal stability. You no longer need to perform pre-flight airspeed calibration routines or recalibrate zero-offsets between summer and winter flights, the sensor maintains absolute accuracy across its entire operating temperature envelope.
Ultra-Compact & Lightweight Weighing virtually nothing and occupying a minimal footprint on your avionics stack, the SDP33 is designed for space-constrained airframes. It provides professional-grade air data without adding unnecessary weight or thermal bulk to your platform.
High Resistance to Mechanical Shock & Vibration Because the SDP33 operates without a delicate mechanical diaphragm, it is inherently immune to motor vibrations, violent launches, and rough belly landings that can cause signal noise or offset shifts in traditional pressure sensors.
Practical uses
✔ Fixed-Wing & Hybrid VTOL UAV Flight Control
✔ High-Precision Drone Surveying & Mapping
✔ Pitot-Static & Air Data Systems (ADS)
✔ Aerodynamic Research & Wind Tunnel Testing
✔ Autonomous Cargo & Inspection Aircraft
Customer reviews
5 stars: 1 (50%)
4 stars: 1 (50%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)
Z
Zoltan V.
Works good
Clean digital I2C output, simple setup in QGroundControl. Good product.
E
Etienne D.
accurate air speed readings
Differential pressure sensor works great on fixed wing plane. no thermal drift issues unlike old sensors.
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