SemiconductorX > Chip Types > Sensing & Connectivity > MEMS Sensors
MEMS Sensors
Micro-electromechanical systems (MEMS) sensors fabricate mechanical sensing structures — membranes, proof masses, resonators, cantilevers — on silicon wafers using semiconductor lithography and etching. The mechanical element converts a physical stimulus (pressure, acceleration, sound, humidity, gas) into an electrical signal that a CMOS readout circuit digitizes. MEMS sensor fabrication is fundamentally incompatible with standard CMOS logic foundries: the deep reactive ion etching (DRIE), sacrificial layer release, and wafer bonding processes required to create free-standing mechanical structures destroy the fragile transistor gates of a logic fab. This is why MEMS production is concentrated at dedicated internal MEMS fabs — Bosch Reutlingen, STMicro Agrate Brianza, Infineon Dresden — rather than at TSMC or Samsung logic foundries.
This page covers environmental MEMS (pressure, humidity, gas/VOC), acoustic MEMS (microphone), and industrial MEMS (vibration, inclination, flow) — the device categories that serve IoT, smart infrastructure, industrial automation, and automotive applications. Inertial MEMS (IMU — accelerometer and gyroscope) are covered in depth on the dedicated IMU & MEMS Inertial Sensors page, which includes the humanoid robot balance sensing supply chain, Bosch BMI088 vibration rejection analysis, and fleet-scale demand modeling.
MEMS Sensor Categories — Devices, Products & Supply Chain
| Category | Flagship products | MEMS mechanism & process | Leading suppliers |
|---|---|---|---|
| Pressure Sensors (absolute, gauge, differential) | Bosch BMP390 (barometric, ±0.03 hPa, IoT/wearable); Bosch BMP581 (next-gen, ultra-low noise); STMicro LPS22HH (MEMS barometer, ±0.5 hPa, AEC-Q100 automotive); Infineon DPS310 (barometric, IoT); TE Connectivity MS5637 (high-precision); Sensata (industrial, process pressure) | Capacitive or piezoresistive silicon membrane deflects under pressure; cavity behind membrane creates reference; capacitance or resistance change is proportional to pressure; bulk micromachining (KOH etch) or surface micromachining; CMOS ASIC readout integrated | Bosch Sensortec (dominant consumer/IoT barometric); Infineon DPS series; STMicro LPS series (automotive); TE Connectivity (industrial process pressure); Honeywell (industrial, medical); Kistler (dynamic pressure, piezoelectric); Measurement Specialties (TE) |
| Humidity & Temperature (combined MEMS/capacitive) | Sensirion SHT40 / SHT41 / SHT45 (capacitive polymer humidity + silicon temp, ±1.8% RH / ±0.2°C, IoT dominant reference design); Sensirion STS41 (temperature only); Bosch BME280 (combined pressure + humidity + temperature, IoT); STMicro HTS221 (automotive cabin humidity); ams-OSRAM AS6212 (contact temp) | Capacitive polymer sensing layer (not MEMS in strict sense — polymer film capacitance changes with water vapor absorption); silicon bandgap temperature sensing element on same die; laser-trimmed calibration; Sensirion CMOSens technology integrates sensing element + ASIC in single chip | Sensirion (dominant — SHT series is the reference design for IoT humidity sensing globally); Bosch Sensortec (BME280 combined sensor); STMicro (automotive HTS221); Honeywell (HIH series, industrial); TE Connectivity (HDC series); Texas Instruments HDC2080 |
| Gas & VOC Sensors (MEMS + electrochemical) | ams-OSRAM ENS160 (metal oxide semiconductor MOX sensor — detects VOC, eCO2, AQI, I2C); Sensirion SGP41 (MOX VOC + NOx, IoT air quality); Bosch BME688 (4-in-1: pressure + humidity + temp + gas MOX); Sensirion SCD41 (photoacoustic NDIR CO2, ultra-compact); MQ-series (discrete metal oxide, low-cost hobbyist reference) | Metal oxide semiconductor (MOX): heated tungsten oxide or tin oxide layer changes conductance when gas molecules adsorb; requires heater element (power consumption concern for battery IoT); photoacoustic NDIR CO2: laser excites CO2 molecules, MEMS microphone detects resulting acoustic signal — no consumable, highly stable; electrochemical: ceramic or polymer electrolyte (not semiconductor) | ams-OSRAM ENS160 (IoT VOC dominant); Sensirion SGP series (IoT air quality, CO2); Bosch BME688 (multi-sensor IoT); Amphenol Advanced Sensors (industrial gas); Figaro (Japan, MOX gas sensor pioneer); Alphasense (UK, electrochemical — not MEMS) |
| Acoustic MEMS Microphones | Infineon IM69D130 (analog MEMS microphone, 69 dB SNR, reference for voice assistant); Infineon IM72D128 (digital PDM, 72 dB SNR); TDK InvenSense ICS-43434 (I2S, 65 dB SNR, smart speaker); Knowles SPH0641LU4H-1 (I2S, low power, wearable); STMicro MP34DT06J (PDM, 64 dB SNR, automotive cabin) | Thin silicon or polysilicon membrane suspended over a backplate cavity; sound pressure deflects membrane; capacitance change between membrane and backplate is amplified by integrated ASIC; die typically packaged in bottom or top port SMT housing; IP57 water ingress rating for outdoor and wearable applications | Infineon (dominant — largest MEMS microphone supplier globally by revenue, acquired Knowles' MEMS microphone production); TDK InvenSense; Knowles (now Infineon MEMS fab customer for some products); STMicro; AAC Technologies (China, package-level); GoerTek (China, assembly dominant) |
| Industrial Vibration & Inclination MEMS | Murata SCL3300 (3-axis inclination sensor, ±0.8° accuracy, AEC-Q100, industrial tilt monitoring); Murata SCC2130 (combined inclination + gyro, construction machine automation); ADI ADXL356 (low-noise 3-axis accelerometer, ±10g, vibration monitoring); Bosch BMA456 (motion detection, wearable); Kistler 8305 (piezoelectric ICP vibration sensor, industrial machinery) | Capacitive MEMS accelerometer proof mass (same principle as IMU accelerometer) for vibration envelope detection; piezoelectric (PZT crystal, not MEMS) for high-frequency industrial vibration — Kistler and PCB Piezotronics use crystal-based ICP sensors rather than MEMS for industrial machinery condition monitoring; Murata bulk micromachining for inclination | Murata (dominant in industrial inclination — SCL3300 reference design for construction machinery and agricultural equipment leveling); ADI (ADXL series, industrial vibration); Kistler (piezoelectric, not MEMS, but dominant in industrial vibration); PCB Piezotronics (Amphenol, industrial ICP); Brüel & Kjær (Hottinger Baldwin Messtechnik, precision vibration) |
| MEMS Flow Sensors | Sensirion SFM3003 (medical oxygen flow, ±3% accuracy, differential pressure MEMS); Sensirion SDP810 (differential pressure for HVAC and ventilator); Honeywell AWM series (thermal mass flow MEMS, HVAC); Siargo MF5700 (thermal mass flow, China); Omron D6F-PH (differential pressure MEMS, HVAC) | Thermal mass flow: heater element + upstream/downstream temperature sensors on MEMS membrane; flow velocity proportional to temperature differential (calorimetric principle); differential pressure: two pressure sensors with venturi or orifice; Sensirion CMOSens flow integrates all elements on single CMOS chip | Sensirion (dominant in precision MEMS flow — SFM series reference for medical ventilators; SDP series for HVAC); Honeywell (AWM thermal mass flow); Omron (D6F differential pressure); Renesas FS2012 (thermal mass flow, IoT gas metering); Siargo (China, thermal mass flow) |
| MEMS Microphones — Automotive & Robot | Infineon IM73A135 (automotive MEMS microphone, AEC-Q100 Grade 2, −40°C to +105°C); STMicro MP34DT06J (automotive cabin, PDM); TDK InvenSense ICS-43434A (automotive cabin); Knowles SPH6645LM4H (automotive grade) | Same capacitive MEMS membrane as consumer microphone; automotive qualification adds extended temperature range, moisture robustness, and AEC-Q100 Grade 2 reliability testing; acoustic port geometry for in-vehicle placement (driver, passenger, rear zone) | Infineon dominant in automotive MEMS microphone following acquisition of microphone assets; STMicro; TDK InvenSense; GoerTek (assembly, China) — hands-free calling, voice assistant (Amazon Alexa Auto, Google Assistant Auto), active noise cancellation, and in-cabin monitoring drive automotive microphone demand |
Deployment & Supply Chain Risk
| Category | Focus sector deployment | Primary supply chain risk |
|---|---|---|
| Pressure sensors | EV battery pack pressure monitoring (cell swelling detection); HVAC duct pressure; smart building automation; industrial process control; robot pneumatic gripper pressure feedback; altitude sensing in drone navigation | Bosch internal MEMS fab concentration; automotive LPS22HH AEC-Q100 lock-in (STMicro); industrial pressure sensors (TE, Honeywell) use non-MEMS piezoresistive elements at high pressure ranges — different supply chain from consumer barometric MEMS |
| Humidity & temperature | Smart building HVAC optimization (occupancy + humidity = comfort and energy efficiency); EV battery pack humidity monitoring (moisture ingress detection); cold chain monitoring; smart agriculture; industrial process environment monitoring | Sensirion Switzerland geographic concentration; SHT series near-monopoly in precision IoT humidity — Sensirion is a fabless company using TSMC and partner fabs; TSMC capacity allocation affects Sensirion supply during demand surges; BME280 Bosch internal fab alternative |
| Gas & VOC sensors | Indoor air quality monitoring (smart building CO2, VOC, AQI); EV battery off-gas detection (electrolyte vapor as early thermal runaway indicator); smart grid substation SF6 leak detection; industrial safety gas monitoring; agricultural greenhouse CO2 management | MOX gas sensor heater element power consumption limits battery IoT deployment — photoacoustic NDIR (Sensirion SCD4x) is the preferred low-power CO2 approach for battery-powered applications but higher ASP; ams-OSRAM ENS160 financial restructuring history creates supply continuity concern for IoT air quality designs |
| Acoustic MEMS microphones | Smart speaker (Amazon Echo, Google Nest — high-volume consumer anchor); voice assistant in automotive (hands-free calling, Alexa Auto); robot voice command interface; smart infrastructure intercom and noise monitoring; industrial machine anomaly detection via acoustic signature | Infineon MEMS microphone production dominance following consolidation; GoerTek (China) dominant in MEMS microphone module assembly — package-level China concentration for high-volume consumer products; automotive grade requires AEC-Q100 which limits to Infineon, STMicro, TDK automotive-qualified variants |
| Industrial vibration & inclination | Predictive maintenance (motor bearing vibration signature monitoring); construction machine leveling and slope sensing (Murata SCL3300 in excavators, graders, forklifts); agricultural equipment automatic leveling; robot base tilt detection; smart grid transformer vibration monitoring | Murata SCL3300 near-monopoly in AEC-Q100 industrial inclination — bulk micromachining process not available at standard MEMS foundries; Kistler and PCB Piezotronics use piezoelectric (not MEMS) for high-frequency industrial vibration — different supply chain entirely; ICP constant-current excitation standard creates Kistler/Brüel & Kjær instrumentation lock-in |
| MEMS flow sensors | Medical ventilator oxygen flow (Sensirion SFM dominant after COVID-19 demand surge validated supply chain); HVAC variable air volume control; EV battery cooling flow monitoring; industrial gas metering (smart meter thermal mass flow); hydrogen fuel cell air supply monitoring | Sensirion near-monopoly in precision medical MEMS flow — COVID-19 ventilator demand surge in 2020 exposed single-source risk; Honeywell AWM as industrial alternative; hydrogen fuel cell applications driving new demand for MEMS flow in electrolyzer and fuel cell balance-of-plant monitoring |
The Internal MEMS Fab Landscape
MEMS sensor production is dominated by internal captive fabs — a structural characteristic that makes MEMS supply chain dynamics fundamentally different from standard logic IC supply chains. Unlike fabless companies that place wafer orders at TSMC or Samsung in response to demand, MEMS IDMs expand capacity only through internal fab investment decisions that take 3–5 years to execute. When demand surges (as it did for ventilator flow sensors during COVID-19 or for consumer pressure sensors during the smartwatch boom), MEMS supply cannot be quickly expanded by redirecting wafers to an alternative foundry.
| MEMS fab | Location | Process character | Primary devices produced |
|---|---|---|---|
| Bosch Reutlingen | Reutlingen, Germany | Surface micromachining; 200mm silicon; 30+ year MEMS process heritage; world's largest dedicated MEMS production facility by capacity; not available to external customers | BMI088 / BMI160 IMU; BMP390 / BMP581 pressure; BMM150 magnetometer; microphone; automotive MEMS for Robert Bosch automotive division |
| STMicro Agrate Brianza | Agrate Brianza, Italy | ThELMA (Thick Epitaxial Layer for MEMS and Accelerometers) surface micromachining; 200mm silicon; second-largest internal MEMS fab after Bosch | LSM6DSO / ASM330LHH IMU; LPS22HH pressure; HTS221 humidity; MP34 microphone; LIS3DH accelerometer |
| Infineon Dresden | Dresden, Germany | Surface micromachining; 200mm silicon; MEMS microphone primary product; shares fab with Infineon silicon power devices and sensors | IM69D130 / IM73A135 MEMS microphones; DPS310 pressure sensor; XENSIV radar sensor family (SiGe, not MEMS — separate line) |
| Murata Fukui / Nagaokakyo | Fukui and Nagaokakyo, Japan | Bulk micromachining — distinct from Bosch / STMicro surface micromachining; provides genuine process diversity; quartz crystal resonator heritage informs MEMS resonator design | SCL3300 inclination sensor; SCC2130 combined inclination + gyro; automotive MEMS sensors; piezoelectric components (separate from MEMS line) |
| Sensirion Stäfa | Stäfa, Switzerland (design); TSMC and partner foundry (fab) | Fabless — uses TSMC CMOSens process (MEMS + CMOS integrated); not a captive internal MEMS fab — the exception to the internal fab rule in this table | SHT humidity/temperature; SGP gas; SFM flow; SDP differential pressure; SCD CO2 (photoacoustic NDIR) |
| ADI Wilmington | Wilmington, Massachusetts, USA | iMEMS surface micromachining; 150mm / 200mm silicon; tactical-grade IMU production; heritage from Draper Laboratory MEMS technology | ADIS16xxx tactical-grade IMU; ADXL accelerometer family; ADI MEMS microphone (smaller volume) |
Supply Chain Bottlenecks
| Bottleneck | Affects | Severity |
|---|---|---|
| Internal MEMS fab capacity inelasticity | All MEMS sensors produced at Bosch, STMicro, Infineon, Murata, ADI captive fabs | High — demand surges cannot be absorbed by redirecting to an alternative foundry; COVID-19 ventilator flow sensor shortage and smartwatch pressure sensor shortage both demonstrated this mechanism; 3–5 year fab expansion timeline |
| Sensirion SHT series near-monopoly (humidity) | IoT humidity sensing reference design globally; smart building, cold chain, agricultural, medical humidity monitoring | Medium — Sensirion fabless on TSMC CMOSens; TSMC dependency is a risk but also a flexibility advantage over fully captive MEMS fabs; Bosch BME280 and TI HDC2080 provide functional alternatives with design effort |
| Infineon MEMS microphone market consolidation | Consumer smart speaker, automotive voice assistant, robot microphone supply | Medium — Infineon dominance post-consolidation reduces supplier alternatives; GoerTek China assembly concentration for consumer microphone modules; automotive automotive-qualified alternatives limited to Infineon, STMicro, TDK |
| Murata SCL3300 inclination near-monopoly | AEC-Q100 industrial inclination sensing in construction, agricultural, and industrial automation equipment | Medium — bulk micromachining process not available at alternative foundries; AEC-Q100 re-qualification 12–24 months; construction and agricultural equipment OEMs have no qualified alternative at equivalent specification |
| Bosch MEMS fab concentration (Germany) | BMI088 IMU (see IMU page), BMP pressure, and all Bosch Sensortec devices simultaneously | Medium — Reutlingen is the world's largest MEMS fab; a single facility event (fire, flood, energy disruption) would simultaneously affect pressure, IMU, and microphone supply across automotive, IoT, and robotics markets |
| ams-OSRAM financial history and ENS160 gas sensor concentration | IoT air quality sensor supply; ENS160 is the dominant VOC/eCO2 IC for smart building and consumer air quality | Medium — ams-OSRAM has undergone significant restructuring; Sensirion SGP41 is the primary alternative for IoT air quality; designs should carry a qualified second source for gas sensing given ams-OSRAM supply chain history |
Related Coverage
IMU & MEMS Inertial Sensors | Ultrasonic Sensors (CMUT/PMUT MEMS) | IR & Thermal Sensors (thermopile MEMS) | Proprioceptive & Control Sensors Hub | Sensor Semiconductors Overview | Analog & Mixed-Signal | Embedded MCU / MPUs | RF & Networking (IoT connectivity SoC) | Semiconductor Bottleneck Atlas
Cross-Network — ElectronsX Demand Side
Smart building HVAC optimization (Sensirion humidity + CO2 + Bosch pressure) is a smart infrastructure demand vector scaling with energy efficiency mandates. EV battery pack pressure and humidity monitoring (cell swelling and moisture ingress detection) are direct EV supply chain dependencies on MEMS sensing. Industrial predictive maintenance (Murata vibration, Kistler vibration) scales with smart factory and Industry 4.0 automation investment. Hydrogen fuel cell balance-of-plant flow monitoring (Sensirion SFM) is a new MEMS demand vector scaling with hydrogen infrastructure buildout.
EX: EV Semiconductor Dependencies | EX: Humanoid Robots | EX: Supply Chain Convergence Map