MPX2102ASX - 100kPa Absolute Pressure Sensor | STMicroelectronics
MPN： MPX2102ASX ✓ 啟用中MPX2102ASX 概覽
A pressure sensor, also known as a pressure transducer, is a device that converts an applied gas or fluid pressure into a proportional electrical signal. Piezoresistive sensors exploit the change in resistance of silicon strain gauges embedded in a flexible diaphragm; as the diaphragm deflects under pressure, the gauges stretch or compress, and a Wheatstone bridge produces a differential output voltage. Pressure sensors belong to the broader class of transducers, which convert one form of energy into another, and they are key building blocks within the Sensors hierarchy (sensor -> transducer -> pressure sensor -> piezoresistive pressure sensor -> absolute pressure sensor) used across industrial, medical, and consumer electronics.
Key specifications include an operating pressure range of 0 to 100 kPa (0 to 14.5 PSI absolute), a full-scale span of 40 mV at 10 V supply, an offset of 0 mV to 1.0 mV, and a temperature-compensated range of 0 to 85 degrees Celsius. The device is factory calibrated for span and offset, eliminating the need for external trimming components in most designs.
The monolithic die incorporates four piezoresistors arranged as a Wheatstone bridge on a silicon diaphragm; a thin-film laser-trimmed network compensates temperature behaviour across the 0 to 85 degrees Celsius range, simplifying downstream signal conditioning.
Typical applications include altimeters and barometric pressure measurement, medical respiratory and blood-pressure instrumentation, HVAC airflow monitors, industrial process control, and environmental weather stations. The 4-SIP module with a ported tube allows easy pneumatic connection via flexible tubing.
When designing with this part, pair the differential output with a low-offset, low-noise instrumentation amplifier such as the INA125 or AD620 to convert the millivolt-level signal to a 0 to 5 V rail-referenced output; the page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 MPX2102ASX — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MPX2102ASX （相同外形與佔位） — 差異在於 Output Type, Operating Pressure Range, Supply Voltage, Mounting Type, Operating Temperature.
MPX2102AP
✅ 直接替換聯絡詢價
查看資料表 →MPX2102A
✅ 直接替換聯絡詢價
查看資料表 →MPXM2102AS
✅ 直接替換聯絡詢價
查看資料表 →MPX2102ASX 最大額定值與電氣特性
| 感測器類型 | Piezoresistive Absolute Pressure Sensor |
| Operating Pressure Range | 0 to 100 kPa (0 to 14.5 PSI absolute) |
| Pressure Type | Absolute |
| Port Type | Male, 0.19 inch (4.93 mm) tube, side-port |
| 輸出類型 | Analog differential Wheatstone bridge |
| Output Voltage Span | 0 mV to 40 mV at 10 V excitation |
| Offset | 0 mV to 1.0 mV |
| 供應電壓 | 10 V DC typical (maximum 16 V DC) |
| 供應電流 | 6 mA typical at 10 V |
| Full-Scale Span (FS) | 40 mV nominal |
| 工作溫度 | -40C to +125C |
| Compensated Temperature Range | 0C to +85C |
| 封裝 | 4-SIP Module (case 344-15) |
| 安裝類型 | Through-hole |
| Termination Style | PCB through-hole pins (4 leads) |
| Sensitivity | 0.4 mV/kPa nominal at 10 V |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
MPX2102ASX 腳位配置
| 腳位 1 | VCC — Bridge excitation supply (typically 10 V DC) |
| 腳位 2 | Vout+ — Positive differential bridge output |
| 腳位 3 | GND — Bridge excitation ground |
| 腳位 4 | Vout- — Negative differential bridge output |
典型應用
MPX2102ASX 適用於 6 應用s: Barometric Altimeter, Medical Respiratory Monitor, HVAC Airflow Pressure Sensing, Environmental Weather Station, Industrial Process Control, Blood Pressure Cuff Monitor.
Barometric Altimeter
The MPX2102ASX fits handheld altimeters and barometric weather stations because its 0 to 100 kPa absolute range maps directly to standard atmospheric pressure at sea level. The on-chip temperature compensation across 0 to 85 degrees Celsius keeps altitude readings stable across diurnal thermal cycles, and the linear 0 to 40 mV differential output at 10 V simplifies conversion by an external 24-bit ADC. Its monolithic Wheatstone-bridge architecture eliminates mechanical hysteresis common to older aneroid capsules, giving faster and more repeatable altitude readings than legacy membrane barometers.
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Medical Respiratory Monitor
The MPX2102ASX is well suited for medical respiratory circuits such as spirometers, CPAP pressure feedback, and ventilator inlet-pressure monitoring. Its 100 kPa absolute range comfortably covers atmospheric plus the modest positive pressure of patient airways, and its calibrated 40 mV span at 10 V provides a low-impedance analog signal ideal for medical-grade instrumentation amplifiers. The single-monolithic-diaphragm design minimizes dead volume in the pneumatic path, important for accurate flow measurement in spirometry.
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HVAC Airflow Pressure Sensing
In HVAC duct-pressure sensors and variable-air-volume controllers, the MPX2102ASX provides a reliable differential bridge output for static and differential pressure drops across filters and coils. With its 4.93 mm tube port, designers can attach flexible pneumatic tubing directly to ductwork, and the calibrated temperature compensation ensures stable readings despite changing supply-air temperature. The 0 to 40 mV span interfaces directly to 4 to 20 mA loop transmitters via a precision op-amp stage for industrial building-automation controllers.
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Environmental Weather Station
For weather monitoring stations, the MPX2102ASX delivers millivolt-level output proportional to atmospheric pressure, allowing simple interfacing to microcontrollers via 16-bit or 24-bit ADCs. The absolute pressure measurement captures true barometric pressure without the need for a separate reference vacuum, simplifying weather-station design and reducing maintenance. Each device is factory laser-trimmed for span and offset, eliminating per-unit calibration for hobbyist and prosumer weather instruments.
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Industrial Process Control
The MPX2102ASX can monitor absolute pressure in chemical-reactor headspaces, vacuum-chamber gauges, and cleanroom differential-pressure loops, where 100 kPa covers most low-pressure industrial setpoints. The 4-SIP case 344-15 footprint mounts directly on PCBs inside sealed enclosures, and the calibrated 0 to 40 mV output pairs easily with galvanic-isolation amplifiers for hazardous-area intrinsically safe installations. On-chip temperature compensation from 0 to 85 degrees Celsius keeps readings stable in factory environments with widely varying ambient temperatures.
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Blood Pressure Cuff Monitor
Non-invasive cuff-type sphygmomanometers can use the MPX2102ASX to measure cuff pressure during inflation and deflation, providing the raw pressure waveform from which systolic and diastolic readings are derived. The 100 kPa absolute range easily accommodates 0 to 300 mmHg cuff pressures (about 0 to 40 kPa) with margin, and the 40 mV full-scale span gives adequate resolution for oscillometric analysis. The piezoresistive design avoids mercury and aneroid calibration drift, making the device attractive for digital home-health and clinical monitors.
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推薦產品摘要
工程參考資料，適用於 MPX2102ASX — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MPX2102AP | MPX2102A | MPXM2102AS | MPXM2102A | MPX2100A |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Package | 4-SIP case 344-15 (side-port) | 4-SIP case 344-15 (axial-port) | 4-SIP case 344-15 (basic-port) | 4-SIP case 344-15 (miniature side-port) | 4-SIP case 344-15 (miniature basic) | 4-SIP case 344-15 (same) |
| Pressure Type | Absolute | Absolute | Absolute | Absolute | Absolute | Differential |
| Operating Pressure | 0 to 100 kPa (14.5 PSI abs) | 0 to 100 kPa | 0 to 100 kPa | 0 to 100 kPa | 0 to 100 kPa | 0 to 100 kPa differential |
| Full-Scale Span | 40 mV at 10 V | 40 mV at 10 V | 40 mV at 10 V | 40 mV at 10 V | 40 mV at 10 V | 40 mV at 10 V differential |
| Port Style | Side, 4.93 mm tube | Axial, 4.93 mm tube | Basic/straight port | Miniature side-port | Miniature basic | Side-port dual tubes (differential) |
| Supply Voltage | 10 V DC typical | 10 V DC typical | 10 V DC typical | 10 V DC typical | 10 V DC typical | 10 V DC typical |
| Compensated Temperature | 0C to +85C | 0C to +85C | 0C to +85C | 0C to +85C | 0C to +85C | 0C to +85C |
主要差異化特點
- Side-port tube orientation (對比MPX2102AP)
- Absolute pressure mode without external reference vacuum (對比MPX2100A)
- On-chip temperature compensation to 85C (對比MPX2102A (basic port))
設計說明
Estimated: With an output span of 40 mV at 10 V excitation, route the bridge Vout+ and Vout- traces as a matched differential pair to the instrumentation amplifier inputs; use a 4-layer PCB with a dedicated analog ground plane and place the INAxx within 25 mm of the sensor to avoid injecting common-mode noise. Choose an instrumentation amplifier with at least 100 dB CMRR and an input offset drift below 0.1 uV/C to preserve the calibrated accuracy of the on-chip temperature compensation.
Estimated: Drive the MPX2102ASX bridge excitation from a low-noise 10 V reference such as the REF102 or the internal reference of the selected instrumentation amplifier; typical supply current at 10 V is 6 mA, so a 10 V x 6 mA = 60 mW budget is appropriate. Add a 1 uF ceramic bypass capacitor close to the bridge supply pin, especially when sharing the 10 V rail with other analog circuitry, to prevent digital switching noise from coupling through the bridge into the millivolt-level output.
Mount the 4-SIP package with its case 344-15 body through PCB through-holes sized per the datasheet land pattern, leaving clearance around the side-port tube for flexible tubing. Do not place heat-generating components (LDOs, power inductors) within 10 mm of the sensor body, because internal temperature rise beyond 85 degrees Celsius will exceed the compensated range and degrade accuracy. Apply RTV silicone to the back-side of the case only if your pneumatic plumbing requires it; do not block the diaphragm-side vent of absolute-pressure variants.
Do not confuse the MPX2102ASX absolute part with the MPX2100A differential part - both share the 4-SIP case 344-15 outline but measure different pressure modes, and substituting them in an absolute-pressure calibration will yield systematically biased readings. Never exceed the 16 V maximum supply rating, and never apply reverse polarity because the bridge is a polysilicon thin-film structure that does not include reverse protection. Always use the calibrated offset range (0 to 1 mV) in software trim rather than relying on additional external trimpots, as factory laser trimming already minimizes offset.
合規資訊
RoHS compliant per ST product page. AEC-Q100 automotive qualification not declared for the standard MPX2102ASX. Lead-free matte-tin plating confirmed; halogen-free status not explicitly listed in the provided datasheet.
