MMA3201KEGR2 - Dual-Axis ±45g Micromachined Accelerometer | NXP
MPN: MMA3201KEGR2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.65 | $4,325.00 |
| 1,000 | $7.4 | $7,400.00 |
MMA3201KEGR2 Overview
An accelerometer is a micro-electromechanical systems (MEMS) sensor that measures proper acceleration (vibrations, shocks, tilt, or motion) along one or more axes by detecting the displacement of a proof mass relative to the silicon frame via capacitive sensing. The MMA3201KEGR2 belongs to a family of silicon capacitive, micromachined accelerometers in which the silicon proof-mass deflection produces a differential capacitance change proportional to applied force. Within the broader sensor taxonomy, this device is a MEMS sensor -> acceleration sensor -> inertial sensor, and within an electronic system it sits at the perception layer of signal chains that require motion feedback, such as airbag controllers, industrial vibration monitors, and tilt platforms.
Key specifications include a sensitivity of 47.5 mV/g to 52.5 mV/g, a 0 g offset of 2.5 V nominal (at Vdd = 5 V), a 4-pole low-pass filter with a -3 dB corner at 400 Hz, ESD protection to ±2000 V (HBM), and an operating temperature range of -40 °C to +105 °C. The dual-axis X/Y output is ratiometric with Vdd, allowing simple ADC interfacing. The 20-SOIC form factor exposes both analog outputs and a self-test pin for built-in diagnostics.
Typical applications include automotive airbag crash detection, industrial vibration monitoring, inertial measurement units, tilt/inclination sensing, seatbelt pretensioner triggers, and platform stabilization. The wide ±45 g range and 400 Hz bandwidth are well-suited to crash-pulse profiles and machine-condition monitoring.
A key design consideration when using the MMA3201KEGR2 is the ratiometric output: the 0 g offset and sensitivity scale with Vdd, so an accurate, low-noise 5 V regulator is required for absolute accuracy. Decouple Vdd close to the package with a 100 nF ceramic in parallel with at least 1 µF of bulk capacitance, route analog outputs over a ground reference, and place the self-test pin so it can be driven high through a dedicated GPIO for production diagnostics.
This page synthesizes distributor pricing, drop-in alternatives, and design notes from sources that augment the manufacturer datasheet, including parametric comparison and qualified replacement guidance to accelerate sourcing and second-source decisions.
Drop-in alternatives for MMA3201KEGR2 — 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 MMA3201KEGR2 (same form factor and footprint) — differing in Bandwidth, Output Type, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MMA3201KEG
✅ Drop-In📋 Reference alternative (not in catalog)
MMA3201EGR2
✅ Drop-In📋 Reference alternative (not in catalog)
MMA2202EGR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MMA3204EGR2
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.25 / Unit
View Datasheet →MMA5212NDKGWR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADXL278
✅ Drop-In📋 Reference alternative (not in catalog)
MMA3201KEGR2 Maximum Ratings & Electrical Characteristics
| Sensor Type | Accelerometer, Dual-Axis (X, Y) |
| Measurement Range | ±45 g |
| Sensitivity | 50 mV/g typical (47.5 to 52.5 mV/g) |
| Bandwidth | 400 Hz (4-pole low-pass filter) |
| Output Type | Analog, ratiometric to Vdd |
| 0 g Offset Voltage | 2.5 V nominal at Vdd = 5 V |
| Supply Voltage (Vdd) | 4.75 V to 5.25 V |
| Operating Temperature | -40 °C to +105 °C |
| Package | 20-SOIC (300 mil), surface mount |
| Mounting Type | Surface Mount |
| Self-Test Pin | Yes (active high) |
| Axis Configuration | X and Y |
| ESD Protection (HBM) | ±2000 V |
| RoHS Status | Compliant |
MMA3201KEGR2 Pin Configuration
| Pin 1 | Vdd — Supply voltage (5 V nominal) |
| Pin 2 | Vdd — Supply voltage (5 V nominal) |
| Pin 3 | XOUT — X-axis analog output (ratiometric to Vdd) |
| Pin 4 | YOUT — Y-axis analog output (ratiometric to Vdd) |
| Pin 5 | ST — Self-test input (active high) |
| Pin 6 | STEN — Self-test enable (active high) |
| Pin 7 | GND — Analog ground |
| Pin 8 | GND — Analog ground |
| Pin 9 | GND — Analog ground |
| Pin 10 | GND — Analog ground |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
MMA3201KEGR2 is suitable for 7 applications: Automotive Airbag Crash Sensing, Industrial Vibration Monitoring, Tilt and Inclination Sensing, Platform Stabilization and Robotics, Appliance and White Goods Shock Detection, Seatbelt Pretensioner Triggering, Data-Logger Inertial Logging.
Automotive Airbag Crash Sensing
The MMA3201KEGR2's ±45 g dual-axis analog output and 400 Hz on-chip 4-pole low-pass filter align directly with automotive airbag front/side impact crash-pulse frequency content. The device's 2.5 V ratiometric 0 g offset lets a 5 V automotive MCU ADC reference the same Vdd rail for accurate conversion; unlike digital-output MEMS sensors (e.g., LIS3DHTR), the analog path adds <10 µs latency - critical for airbag firing decisions inside the sensor's microcontroller where total response time budgets typically allow <5 ms from impact to deploy command. Designers typically pair the device with NXP/Freescale automotive MCUs such as the MPC5604E and add an external self-test routine on each power-up.
Recommended
Industrial Vibration Monitoring
In industrial vibration monitoring for predictive maintenance, the MMA3201KEGR2's ±45 g range covers the vibration amplitude envelope of most rotating machinery from pumps to HVAC compressors. The 50 mV/g sensitivity and 400 Hz bandwidth provide spectral resolution across the typical fault-frequency band (motor harmonics up to ~400 Hz). Unlike MEMS gyroscopes or 6-axis IMUs (e.g., LSM6DS3), the simple two-axis analog architecture of the MMA3201 simplifies front-end conditioning and integrates with legacy analog conditioning boards; ADC sampling rate above 2 ksps per axis is recommended to capture shaft-imbalance harmonics.
Recommended
Tilt and Inclination Sensing
Single-axis tilt and platform-stabilization applications benefit from the MMA3201KEGR2's 2.5 V ratiometric 0 g reference and ±45 g dual-axis sensing. At 1 g tilt, the output moves ~50 mV per axis, providing enough resolution for angle-magnitude sensing to within ~1° after averaging on an MCU with a 12-bit ADC ratiometric to Vdd. Unlike electrolytic tilt sensors, the silicon MEMS construction eliminates drift in vibrating environments. Engineers calibrate the device in-system by reading 0 g at power-on and using the resulting offset to compute tilt - this compensates for both Vdd variation and long-term sensor aging.
Recommended
Platform Stabilization and Robotics
In robotics and platform stabilization, the MMA3201KEGR2's high ±45 g range and 50 mV/g sensitivity enable direct measurement of inertial disturbance along the X and Y axes - ideal for camera gimbals, AGV bump detection, and humanoid robot balance feedback. The 400 Hz analog bandwidth captures the dominant inertial transients experienced during rapid motion changes; the 4-pole on-chip filter rejects motor PWM noise that often couples into adjacent MEMS signals. Designers commonly feed the MMA3201's two analog outputs into two synchronized ADC channels of a robotics MCU (e.g., STM32 or K66) running a Kalman filter for state estimation.
Recommended
Appliance and White Goods Shock Detection
Washing machines, dryers, and dishwashers require shock detection during unbalanced load events or transport. The MMA3201KEGR2's ±45 g range captures the typical 5-30 g peaks of drum imbalance, while the wide 4.75-5.25 V supply tolerance accommodates the unregulated rails in many white-goods power designs. The 20-SOIC surface-mount package is mechanically robust compared to smaller QFN or LGA alternatives; the on-chip 4-pole filter eliminates the spurious high-frequency motor noise that dominates in close-proximity motor environments, simplifying EMC compliance.
Recommended
Seatbelt Pretensioner Triggering
For seatbelt pretensioner modules, the MMA3201KEGR2's small footprint and dual X/Y axis sensing enable mounting directly on the buckle or retractor assembly, where the unit must detect crash direction at the cabin perimeter. The 50 mV/g ratiometric output couples directly to a small 8-bit automotive MCU ADC, which evaluates crash profile against stored thresholds within the 5-10 ms deployment window. The built-in self-test pin reduces assembly-line test time, and the integrated 400 Hz anti-alias filter simplifies firmware compared to a sampled digital sensor at lower power.
Recommended
Data-Logger Inertial Logging
Portable data loggers for vehicle dynamics testing, sports performance monitoring, and impact loggers benefit from the MMA3201KEGR2's wide ±45 g measurement envelope and 400 Hz analog bandwidth. Unlike digital-output IMUs, the analog output allows direct post-processing from raw signals without a sensor driver stack, which is convenient when logging to a generic analog-front-end FPGA or DSP board. The wide temperature range (-40 °C to +105 °C) tolerates in-cabin summer heat in vehicle testing. A typical implementation samples both axes at >2 ksps and timestamps via GPS PPS to correlate events with vehicle speed.
Recommended
Recommended Products Summary
Engineering reference data for MMA3201KEGR2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MMA3201KEG | MMA3201EGR2 | MMA2202EGR2 | MMA3204EGR2 | MMA5212NDKGWR2 | ADXL278 |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | Analog Devices (cross-brand) |
| Package | 20-SOIC (300 mil) | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | 20-SOIC - same | LCC-8 - different |
| Output Type | Analog, ratiometric | Analog, ratiometric (same) | Analog, ratiometric (same) | Analog, ratiometric (same) | Analog, ratiometric (same) | Analog, ratiometric (same) | Analog, ratiometric (functional match) |
| Operating Temperature | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C | -40 °C to +105 °C |
| Self-Test Pin | Yes (active high) | Yes (identical) | Yes (identical) | Yes (same family) | Yes (same family) | Yes (same family) | Yes (functional match) |
Key Differentiators
- Drop-in ±45 g dual-axis in 20-SOIC with on-chip 4-pole 400 Hz LPF (vs MMA3204EGR2)
- Higher-g over-range tolerance (vs MMA2202EGR2)
- Self-test pin enables end-of-line diagnostics (vs ADXL278)
Design Notes
Decouple the MMA3201KEGR2 Vdd pin (shared between pins 1 and 2) with a 100 nF X7R ceramic placed within 5 mm of the package, plus a 1 µF X5R bulk capacitor. Because both the 2.5 V 0 g offset and 50 mV/g sensitivity are ratiometric to Vdd, supply noise couples directly into the output - use a low-noise 5 V regulator such as TPS7A45 or LT1764 with PSRR >70 dB at 1 kHz, and avoid sharing the analog Vdd with PWM or relay drive rails. Estimated: with a 50 mV/g gain and a 50 mV Vdd ripple, worst-case gain error is ~1% per g plus a 1.7% offset error - bound below by a tight regulator.
Route both XOUT and YOUT analog traces over a continuous ground reference, ideally on the top layer without vias, and keep them away from switching power nodes or high-frequency clock traces. The MMA3201KEGR2's 4-pole low-pass filter internal capacitor divides noise symmetrically between outputs - a noisy PCB layout bypasses the filter's purpose. Place the 100 nF + 1 µF Vdd decoupling pair as close to pins 1-2 as physically possible. Pin 1 of the 20-SOIC should align with the package indicator dot.
Do not exceed 5.25 V on Vdd or apply reverse polarity, as the device lacks internal reverse-polarity protection. The self-test pin (ST) should be left floating or driven to Vdd only after power is stable; do not toggle ST during normal operation as it injects an offset. Do not install the device near a heat source above +105 °C or in a sealed enclosure without ventilation. Verify with the manufacturer datasheet AEC-Q100 grade when designing for automotive airbag systems requiring safety-rated components.
The MMA3201KEGR2 outputs an analog voltage with nominal bandwidth of 400 Hz, so the host ADC sampling rate must be at least 1 ksps per axis to satisfy the Nyquist criterion for the integrated 4-pole anti-alias filter. Use a sampling rate >=2 ksps per axis to retain 5x oversampling gain via an averaging filter. Match Vdd to the ADC reference for ratiometric cancellation of supply-noise error; a 12-bit SAR ADC is generally sufficient for the 50 mV/g sensitivity in safety applications.
Compliance Information
RoHS compliance and lead-free confirmable from NXP product page. Note: this family variant typically without AEC-Q100; verify for safety-critical automotive applications via NXP product selector.
