MMA5212AKWR2 - ±120g X-Axis PSI5 Satellite Accelerometer | NXP
MPN: MMA5212AKWR2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.72 | $87.20 |
| 100 | $7.4 | $740.00 |
| 500 | $6.55 | $3,275.00 |
| 1,000 | $5.9 | $5,900.00 |
MMA5212AKWR2 Overview
An accelerometer is a micro-electromechanical sensor that converts physical acceleration into a measurable electrical signal. Within the broader sensor hierarchy, it sits at the inertial sensor family, sharing the category with gyroscopes, magnetometers, and 6-axis IMUs. The MMA52xxAKW family is positioned at the automotive-grade peripheral satellite node in a PSI5 airbag network, where it reports crash-relevant deceleration events to a central airbag ECU.
Key features include a 5 V / 9 V / 12 V / 15 V compatible PSI5 interface, internal self-test, automotive temperature grade qualification, and a -40 °C to +125 °C operating range. The overdamped mechanical transfer function suppresses high-frequency vibration that would otherwise cause false crash triggers in rough-road or door-slams scenarios. The device is a NXP SafeAssure solution, meaning it has been developed and documented under NXP's functional-safety process to support ISO 26262 systems.
Architecturally, the part uses a capacitive MEMS proof mass with sigma-delta conversion and digital post-processing, which provides low noise and stable sensitivity over temperature without external trimming. The PSI5 peripheral mode frames deliver acceleration data, status bits, and a 10-bit temperature word each synchronization cycle.
Typical applications include front or side satellite airbag sensors, pedestrian protection modules, and chassis-condition monitoring nodes. Design considerations include placing the recommended 2.2 nF / 470 pF / 15 nF external capacitor network (C1–C5) within a few millimeters of the supply and data pins to maintain PSI5 signal integrity and EMC margins.
This page consolidates distributor pricing, drop-in cross-family alternatives, and PCB layout notes the NXP safety manual only summarizes, so engineers can validate sourcing and footprint fit on a single page.
Drop-in alternatives for MMA5212AKWR2 — 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 MMA5212AKWR2 (same form factor and footprint) — differing in Supply Voltage, Operating Temperature, RoHS Status, Automotive Qualification, Axis.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MMA5224AKWR2
✅ Drop-In✓ In Stock
$8.4 / Unit
View Datasheet →MMA5112AKWR2
✅ Drop-In📋 Reference alternative (not in catalog)
MMA5212KWR2
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →MMA5260AKWR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MMA5148AKWR2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MMA5212AKWR2 Maximum Ratings & Electrical Characteristics
| Sensor Type | Accelerometer, single-axis (X-lateral) |
| Full-Scale Range | ±120 g |
| Axis | X-axis (lateral) |
| Interface | PSI5 v1.3 asynchronous peripheral mode |
| Supply Voltage | 5 V / 9 V / 12 V / 15 V (PSI5 bus-fed) |
| Operating Temperature | -40 °C to +125 °C (Automotive Grade) |
| Mechanical Bandwidth | Overdamped (vibration-tolerant) |
| Package | 16-QFN exposed pad, 6 mm × 6 mm |
| Pin Count | 16 |
| Mounting Type | Surface Mount |
| Internal Self-Test | Yes (built-in electromechanical self-test) |
| Self-Test Status | Reported in PSI5 status bit |
| On-Chip Temperature Sensor | Yes, 10-bit digital output |
| Functional Safety Process | NXP SafeAssure (supports ISO 26262) |
| External Components | 2.2 nF (C1), 470 pF (C3), 15 nF (C2) decoupling/filter |
| RoHS Status | Compliant (Pb-free) |
MMA5212AKWR2 Pin Configuration
| Pin 1 | VCC — PSI5 bus-fed supply (5V/9V/12V/15V) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | IDATA — PSI5 data line (current loop) |
| Pin 4 | GND — Ground return |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | SYNC — PSI5 synchronization input from ECU |
| Pin 7 | TEST — Test/self-test pin |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | VCC — PSI5 bus-fed supply redundant pin |
| Pin 10 | GND — Ground return redundant pin |
| 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) |
Typical Applications
MMA5212AKWR2 is suitable for 6 applications: Side-Impact Airbag Satellite Sensor, Front-Impact Peripheral Satellite, Pedestrian Protection Module (PPS), Rollover Detection Satellite, Battery Monitoring Vehicle Dynamics (Chassis Network), Industrial Shock and Vibration Logger.
Side-Impact Airbag Satellite Sensor
The MMA5212AKWR2's ±120 g lateral full-scale range and overdamped mechanical response make it ideal as a side-impact (B-pillar) satellite in a PSI5 airbag network. Its SafeAssure development under NXP's ISO 26262 process supports ASIL classification by the host ECU. Placed at the chassis B-pillar or door cavity, it streams deceleration data via PSI5 v1.3 asynchronous peripheral mode, allowing the airbag ECU to discriminate between a real side crash and a door slam or curb impact.
Recommended
Front-Impact Peripheral Satellite
Used as a peripheral satellite in the front crumple zone, the MMA5212AKWR2 provides redundant lateral acceleration data to a primary frontal ECU. The -40 °C to +125 °C automotive operating range and on-chip 10-bit temperature compensation keep sensitivity flat from cold-cranking in winter to high-temperature engine-bay soak. The PSI5 bus-fed supply (5-15 V) eliminates a separate power line, simplifying wiring harness and connector pin-count.
Recommended
Pedestrian Protection Module (PPS)
In a pedestrian protection system, the MMA5212AKWR2's lateral sensitivity detects the initial impulse from a leg impact and feeds timing data to the ECU, which decides whether to fire the active hood lifter. The overdamped MEMS suppresses suspension and road-vibration transients that would otherwise cause false positives. PSI5 asynchronous peripheral mode keeps the master daisy-chain polling time low.
Recommended
Rollover Detection Satellite
Mounted at the A-pillar base or roof rail, the MMA5212AKWR2 contributes lateral acceleration evidence to a multi-sensor rollover algorithm running on a host airbag ECU. Its 16-QFN (6x6) package allows compact PCB placement at the satellite node, and the recommended 2.2 nF/470 pF/15 nF passive network keeps the PSI5 IDATA rise/fall time within the bus mask.
Recommended
Battery Monitoring Vehicle Dynamics (Chassis Network)
Although primarily an airbag part, the MMA5212AKWR2 is sometimes deployed as a redundant lateral node in electric-vehicle chassis stability networks to back up a 6-axis IMU during ESP interventions. The PSI5 bus is easily bridged to CAN via TJA1027, and the same SafeAssure documentation set helps the system integrator qualify the chassis node to ISO 26262 ASIL.
Recommended
Industrial Shock and Vibration Logger
Beyond automotive airbags, the MMA5212AKWR2's ±120 g range and PSI5 bus make it usable in industrial shock-data loggers mounted on heavy machinery or shipping containers. The bus-fed supply allows long cable runs from a central host. The 10-bit on-chip temperature stream provides co-located thermal context for impact events, helping engineers correlate mechanical shocks with environmental conditions.
Recommended
Recommended Products Summary
Engineering reference data for MMA5212AKWR2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MMA5224AKWR2 | MMA5112AKWR2 | MMA5212KWR2 | MMA5260AKWR2 | MMA5148AKWR2 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 16-QFN (6x6) | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same | 16-QFN (6x6) - same |
| Full-Scale Range | ±120 g | ±240 g | ±60 g | ±120 g | ±60 g (Z-axis) | ±187 g |
| Axis | X (lateral) | X (lateral) | X (lateral) | X (lateral) | Z | X (lateral) |
| Interface | PSI5 v1.3 async | PSI5 v1.3 async | PSI5 v1.3 async | PSI5 v1.3 async | PSI5 v1.3 async | PSI5 v1.3 async |
| Supply Voltage | 5/9/12/15 V | 5/9/12/15 V | 5/9/12/15 V | 5/9/12/15 V | 5/9/12/15 V | 5/9/12/15 V |
| On-Chip Temperature Sensor | Yes (10-bit) | Yes (10-bit) | Yes (10-bit) | Yes (10-bit) | Yes (10-bit) | Yes (10-bit) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Internal Self-Test | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Bus-fed PSI5 v1.3 asynchronous peripheral mode eliminates a separate power line (vs STMicroelectronics AIS3624 (I²C/SPI airbag IMU))
- Overdamped mechanical response suppresses road-vibration false triggers (vs Generic undamped MEMS accelerometer in same package)
- SafeAssure/ISO 26262 documentation out of the box (vs Industrial-grade MEMS accelerometers)
Design Notes
Per the NXP Xtrinsic MMA52xxAKW datasheet, place C1 (2.2 nF X7R 50V), C2 (15 nF X7R 50V), and C3 (470 pF X7R 50V) within 3 mm of the VCC and IDATA pads. Use a star-ground topology that ties the exposed pad directly to a continuous copper pour stitched with multiple vias to the inner ground plane. Avoid routing the IDATA trace parallel to noisy high-current injection traces for more than 10 mm to preserve the PSI5 current-loop rise/fall time mask.
The PSI5 interface is a 2-wire current loop with sync pulses from the ECU. Terminate the bus with the resistor value specified by the host ECU PSI5 master and keep total cable capacitance below the master datasheet limit (typically < 10 nF for a 4-satellite bus). Estimated: at 4 satellites each with 470 pF filter cap plus 30 pF/m cable, a 3 m harness gives ~1.5 nF total, well within typical budget.
Do not exceed 16 V on VCC or apply reverse polarity - the device is bus-fed and lacks a series protection diode. Verify the SYNC pulse width matches the PSI5 v1.3 master specification (typically 16 µs); a stretched SYNC can corrupt the asynchronous data frame. Always invoke the on-chip electromechanical self-test during ECU power-up before reporting sensor health to the host.
Compliance Information
Automotive-grade temperature range -40 °C to +125 °C. Developed under NXP SafeAssure process supporting ISO 26262 functional safety. RoHS/Pb-free per NXP product page.
