MPX2100ASX - 100 kPa Absolute Pressure Sensor | NXP Semiconductors
MPN: MPX2100ASX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.8 | $980.00 |
| 500 | $8.45 | $4,225.00 |
| 1,000 | $7.3 | $7,300.00 |
MPX2100ASX Overview
An absolute pressure sensor is a transducer that measures pressure referenced to a sealed vacuum reference chamber rather than ambient atmosphere; this allows accurate altitude-independent pressure readings across wide environmental conditions. The MPX2100 series belongs to the piezoresistive silicon sensor family, sitting within the broader sensor taxonomy: pressure sensor -> board mount pressure sensor -> MEMS sensor -> semiconductor device. Absolute variants are essential in applications where atmospheric pressure varies (e.g., unmanned aerial vehicles, weather instrumentation) because the sealed vacuum reference provides a stable zero point.
Key features include on-chip signal conditioning via a monolithic piezoresistive Wheatstone bridge, factory calibration at 10 V excitation, and laser-trimmed resistors for temperature compensation across the operating range. The 4-SIP module package is designed for through-hole PCB mounting with an integrated axial pressure port that accepts a 4.92 mm tube, simplifying pneumatic interfacing in industrial equipment and medical instruments.
The MPX2100ASX architecture uses a single silicon diaphragm with diffused piezoresistive strain gauges arranged in a Wheatstone bridge; this monolithic approach reduces part count, eliminates external calibration, and provides robust ratiometric output that scales linearly with excitation voltage. The vacuum reference is hermetically sealed on the rear of the die, ensuring long-term reference stability.
Typical applications include barometric pressure measurement in weather stations, altimeters for drones and aviation instrumentation, industrial process control, HVAC pressure monitoring, and medical respiratory equipment such as spirometers and ventilators. The wide operating pressure range and sealed absolute reference also suit vacuum system monitoring and sealed gas pressure applications.
When designing with this part, place the 4-SIP module with adequate clearance around the axial tube inlet to ensure reliable pneumatic connection. Use a stable low-noise excitation supply of 10 V DC; ratiometric output means supply noise translates directly into measurement noise, so the supply should be well decoupled.
This page synthesizes distributor pricing snapshots, drop-in pin-compatible alternatives, and practical design notes that are not collected together on any single manufacturer datasheet, enabling faster integration of the MPX2100ASX into new pressure measurement designs.
Drop-in alternatives for MPX2100ASX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MPX2100ASX (same form factor and footprint) — differing in Mounting Type, Operating Pressure Range, Output Type, Temperature Compensation.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MPX2102ASX
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →MPX4100ASX
✅ Drop-In📋 Reference alternative (not in catalog)
MPX2100AP
✅ Drop-In✓ In Stock
$11.85 / Unit
View Datasheet →MPX2100ASXPBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MPX5700ASX
✅ Drop-In📋 Reference alternative (not in catalog)
MPX2100ASX Maximum Ratings & Electrical Characteristics
| Pressure Type | Absolute |
| Operating Pressure Range | 14.5 PSI (100 kPa) |
| Output Voltage Range | 0 mV to 40 mV (at 10 V supply) |
| Supply Voltage (Excitation) | 10 V DC nominal |
| Output Type | Wheatstone bridge (ratiometric, analog mV output) |
| Pressure Port Type | Axial tube, Male, 0.19 inch (4.92 mm) |
| Package / Case | 4-SIP Module (through-hole) |
| Mounting Type | Through Hole |
| Temperature Compensation | On-chip (calibrated and laser-trimmed) |
| Number of Pins | 4 |
| MSL Moisture Sensitivity Level | Not applicable (through-hole / non-surface-mount module) |
MPX2100ASX Pin Configuration
| Pin 1 | Vout+ — Bridge positive output |
| Pin 2 | Vout- — Bridge negative output |
| Pin 3 | VS+ — Excitation supply positive (10 V nominal) |
| Pin 4 | VS- / GND — Excitation supply negative (ground) |
Typical Applications
MPX2100ASX is suitable for 7 applications: Drone / UAV Barometric Altimeter, Weather Station Barometric Pressure Measurement, Medical Respiratory Equipment / Spirometer, HVAC Duct Pressure Monitoring, Industrial Process Vacuum Monitoring, Automotive Manifold Absolute Pressure (Reference Design Only), Tabletop Weather / Altitude Data Logger.
Drone / UAV Barometric Altimeter
The MPX2100ASX suits drone altitude estimation through its 0-100 kPa absolute range and sealed vacuum reference. The piezoresistive Wheatstone bridge delivers a ratiometric 0-40 mV output at 10 V that is read by a microcontroller ADC via an instrumentation amplifier such as the INA128, providing 10 cm altitude resolution with proper filtering. Unlike gauge-pressure sensors, the absolute reference makes readings immune to weather changes during flight, which is critical for stable altitude hold. A low-pass RC filter on the bridge output plus a stable low-noise 10 V LDO such as the MC78M10 reduces measurement drift. Mounting with vibration isolation decouples the 4-SIP module from the UAV frame to preserve accuracy.
Recommended
Weather Station Barometric Pressure Measurement
The MPX2100ASX supports weather-station barometric measurement with its 0-100 kPa absolute range covering the meteorologically relevant 870-1080 hPa span. On-chip temperature compensation and factory calibration eliminate manual linearization, so a simple ADS1115 16-bit ADC with 0.5 mV resolution easily reads the 0-40 mV bridge output at 10 V excitation. The sealed vacuum reference means long-term stability of the absolute reading, unlike gauge sensors that drift as the diaphragm ages. Use a weatherproof enclosure with the 4-SIP axial tube vented to ambient via a hydrophobic membrane to prevent water ingress while allowing pressure equalization.
Recommended
Medical Respiratory Equipment / Spirometer
The MPX2100ASX is well-suited for spirometer flow-pressure monitoring because its 0-100 kPa range covers breath-derived pressures and the 0-40 mV ratiometric output interfaces cleanly with medical-grade instrumentation amplifiers like the INA128. The 4-SIP axial port accepts standard 4 mm medical tubing directly, simplifying patient-circuit integration. On-chip temperature compensation reduces thermal drift across clinical-environment temperature swings, supporting measurement repeatability between tests. Use a buffered low-pass filter (1 kHz cutoff, second-order Sallen-Key) on the amplifier output to remove breathing harmonics and 50/60 Hz mains pickup.
Recommended
HVAC Duct Pressure Monitoring
Building HVAC systems use the MPX2100ASX for duct static-pressure sensing in the 0-100 kPa range, where the differential pressure across filters and fans indicates system health. The 4-SIP axial tube port simplifies pneumatic tap installation with a single 4 mm bulkhead fitting, reducing installation labor compared to differential-port alternatives. The 0-40 mV bridge output feeds a 24-bit ADC like the ADS1220 for high-resolution filter-loaded detection. The on-chip temperature compensation covers rooftop HVAC environments from -40 to +85 C without additional drift correction.
Recommended
Industrial Process Vacuum Monitoring
The MPX2100ASX monitors sealed-vacuum industrial processes such as food packaging and vacuum-furnace residual pressure using its 0-100 kPa absolute range and stable internal vacuum reference. The single axial port accepts a 4 mm pneumatic line for direct connection to the vacuum chamber. With the 0-40 mV output at 10 V excitation, a low-noise amplifier stage such as the OPA2277 with gain of 100 delivers 0-4 V for direct ADC input, while a MAX31865 RTD channel provides local temperature compensation for traces that run near heat sources. The 4-SIP module is mechanically robust and tolerates the vibration environment near vacuum pumps.
Recommended
Automotive Manifold Absolute Pressure (Reference Design Only)
Although the MPX2100ASX is not AEC-Q100 qualified and therefore not recommended for safety-critical automotive manifold absolute pressure (MAP) sensing, the same family architecture is widely used as a reference design. In non-safety automotive applications such as cabin HVAC pressure monitoring or accessory-sensor prototyping, the MPX2100ASX provides a 0-40 mV ratiometric output proportional to 0-100 kPa absolute pressure for fast breadboarding. The 4-SIP axial port accepts standard 4 mm tubing for in-cabin pressure-line tapping. A production automotive MAP design should migrate to the AEC-Q100 qualified MPXH6115A or MPXH6400A family rather than the legacy MPX2100ASX.
Recommended
Tabletop Weather / Altitude Data Logger
The MPX2100ASX provides a low-cost 0-100 kPa absolute pressure front-end for hobbyist and educational altitude data loggers because the 0-40 mV output interfaces directly with microcontroller ADCs such as the ATmega328P on Arduino platforms via a two-op-amp instrumentation front-end. The sealed absolute reference captures altitude variations from sea level to about 1000 m without re-calibration. On-chip temperature compensation reduces environmental drift during long logging campaigns. The 4-SIP axial port simplifies enclosure integration with a 4 mm push-on tube fitting for outdoor vented referencing.
Recommended
Recommended Products Summary
Engineering reference data for MPX2100ASX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MPX2102ASX | MPX4100ASX | MPX2100AP | MPX2100ASXPBF | MPX5700ASX |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 4-SIP axial port module (through-hole) | 4-SIP axial port module (same) | 4-SIP axial port module (same) | 4-SIP module, tray pack (same lead-out) | 4-SIP axial port module (same) | 4-SIP axial port module (same) |
| Pressure Type | Absolute | Absolute | Absolute | Absolute | Absolute | Absolute |
| Operating Pressure Range | 0 to 14.5 PSI (0 to 100 kPa) | 0 to 14.5 PSI (0 to 100 kPa) - same | 2.9 to 15.2 PSI (20 to 105 kPa) - similar band | 0 to 14.5 PSI (0 to 100 kPa) - same | 0 to 14.5 PSI (0 to 100 kPa) - same | 0 to 101.5 PSI (0 to 700 kPa) - higher range |
| Output Voltage Range | 0 mV to 40 mV (at 10 V supply) | 0 mV to 40 mV (at 10 V supply) - same | 0.3 V to 4.9 V (at 5 V supply) - amplified | 0 mV to 40 mV (at 10 V supply) - same | 0 mV to 40 mV (at 10 V supply) - same | 0 mV to 40 mV at lower pressure points (ratiometric) |
| Supply Voltage (Excitation) | 10 V DC nominal | 10 V DC nominal | 5.0 V DC typical (with embedded amplifier) | 10 V DC nominal | 10 V DC nominal | 10 V DC nominal |
| Pressure Port | Axial male, 0.19 inch (4.92 mm) tube | Axial male, 4.92 mm tube | Axial male, 4.92 mm tube | Axial male, 4.92 mm tube | Axial male, 4.92 mm tube | Axial male, 4.92 mm tube |
| Temperature Compensation | On-chip calibrated and laser-trimmed | On-chip calibrated | On-chip calibrated with amplifier | On-chip calibrated and laser-trimmed | On-chip calibrated and laser-trimmed | On-chip calibrated |
Key Differentiators
- Sealed vacuum reference for absolute measurements (vs MPX2100DP (gauge variant))
- Pin-compatible upgrade path to amplified output (vs MPX4100ASX)
- Extended pressure range option in same package (vs MPX5700ASX)
- Legacy long-life product with stable supply (vs Newer MEMS packages (e.g. BMP280 surface mount))
Design Notes
Use a stable low-noise 10 V DC excitation source for the MPX2100ASX, since the 0-40 mV bridge output is ratiometric and supply noise translates directly into measurement noise. A linear regulator such as the MC78M10 (TO-220) followed by an RC filter (10 ohm + 10 uF) placed within 5 cm of the VS+ pin reduces supply-induced drift. For systems powered from a 5 V rail, a small DC-DC boost followed by an LDO provides the necessary 10 V headroom. Estimated: at 10 V excitation the sensor draws approximately 6 mA, so the regulator should be rated for at least 100 mA to maintain headroom margin.
Place the 4-SIP module with a clearance keep-out area of at least 6 mm radius around the axial pressure port to prevent vibration coupling into the diaphragm through the PCB. Route the four pins (Vout+, Vout-, VS+, VS-/GND) with short traces directly into the instrumentation amplifier inputs and decoupling capacitors; keep digital logic traces at least 5 mm away from the analog bridge traces. Place a 100 nF ceramic bypass capacitor as close as possible to the VS+ and VS- pins to suppress high-frequency noise.
The 0-40 mV full-scale differential output of the MPX2100ASX is vulnerable to common-mode noise pickup on the long PCB traces. Use a true instrumentation amplifier topology (such as the INA128 or INA333) with the bridge outputs as the differential inputs, and route Vout+ and Vout- as a closely-coupled twisted or parallel pair on the PCB to maximize common-mode rejection. Add a second-order Sallen-Key low-pass filter with a 100 Hz cutoff before the ADC to suppress 50/60 Hz mains interference and pneumatic-line noise.
Do not connect the MPX2100ASX axial port directly to a high-pressure gas line without a snubber; sudden pressure spikes above 200 kPa can damage the silicon diaphragm. Avoid handheld soldering directly on the 4-SIP package leads at temperatures above 350 C for more than 10 seconds; use a heat sink clip during lead soldering. Estimated: the diaphragm burst pressure is typically 2x the rated maximum, so in vacuum service confirm that reverse-side sealing pressure never exceeds 100 kPa differential or the die will crack. Do not assume the absolute reading is independent of orientation - the sealed vacuum reference makes the device orientation-insensitive on Earth, but rapid acceleration can shift readings momentarily.
The on-chip temperature compensation of the MPX2100ASX covers -40 C to +125 C but is most accurate at the factory-calibrated points. For high-accuracy altitude measurements over wide temperature swings, add an external local temperature sensor (such as the TMP36 or onboard NTC) and apply a secondary correction polynomial in firmware. Estimated: with default on-chip compensation the typical zero-pressure output drift is approximately 1 mV across the full -40 to +125 C range, which corresponds to roughly 2.5 kPa of absolute pressure error - acceptable for weather instrumentation but not for precision altimetry.
Compliance Information
RoHS, REACH, lead-free, halogen-free data are not provided in the verified web sources and are marked unknown. AEC-Q100 status is not_applicable/not_qualified - the MPX2100ASX is a legacy industrial-grade pressure sensor and is not AEC-Q100 qualified; for automotive applications use the MPXH6115A/MPXH6400A family. Conflict minerals compliance assumed per NXP corporate policy but not explicitly stated in the verified sources.
