MMA8205TEGR2 - ±50g X/Z-Axis Digital Accelerometer | NXP | 16-SOIC
Référence : MMA8205TEGR2 ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $15.85 | $15,85 |
| 10 | $14.92 | $149,20 |
| 100 | $13.45 | $1 345,00 |
| 500 | $12.1 | $6 050,00 |
| 1 000 | $10.85 | $10 850,00 |
MMA8205TEGR2 Présentation
An accelerometer is a MEMS (Micro-Electro-Mechanical Systems) sensor that measures proper acceleration along one or more axes, converting mechanical displacement of a proof mass into a proportional electrical signal. In the broader taxonomy, the MMA8205TEGR2 belongs to the inertial sensor family, which is itself a sub-category of motion sensors and a subset of physical sensors. Single-axis accelerometers typically serve high-g applications such as airbag deployment, side-impact detection, rollover sensing, and industrial vibration monitoring where multi-axis devices are unnecessary or cost-prohibitive.
Key specifications of the MMA8205TEGR2 include a ±50 g full-scale range, integrated self-test capability, signal conditioning with on-chip low-pass filtering, and a self-clocked SPI output. The wide 6.3 V to 30 V supply range allows direct connection to automotive 12 V or 24 V battery rails without additional pre-regulation, simplifying ECU power tree design. The SOIC-16 package with 300-mil body width is compatible with standard PCB assembly processes used in automotive electronics manufacturing.
The MMA8205TEGR2 uses a differential capacitive sensing architecture: a silicon proof mass moves between fixed plates, creating a capacitance change proportional to acceleration. On-chip circuitry converts this capacitance change into a digital word using sigma-delta modulation and decimation filtering. The integrated signal chain eliminates the need for external analog-to-digital conversion and provides inherent immunity to electrical noise on the sensor element, a critical feature for automotive EMI environments.
Typical applications for the MMA8205TEGR2 include airbag crash sensors, seatbelt pretensioner triggers, side-impact detection modules, industrial vibration monitors, and machinery impact alarms. Its ±50 g range and ruggedized package make it particularly suitable for events involving rapid, high-magnitude acceleration transients.
When designing with the MMA8205TEGR2, ensure the host microcontroller samples the SPI output at the proper clock rate and applies the correct g-per-LSB scaling factor. Bypass capacitors placed close to the supply pins are mandatory to suppress the switching transients commonly present on automotive power buses. Verify ESD handling procedures, as automotive-grade MEMS sensors require controlled manufacturing environments.
This page synthesizes NXP datasheet specifications, distributor pricing, drop-in alternative pin-compatible parts, and practical design notes that go beyond what the manufacturer datasheet alone provides, giving engineers a complete evaluation reference for airbag and high-g sensing designs.
Alternatives de remplacement direct pour MMA8205TEGR2 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MMA8205TEG
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA8205LEGR2
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MMA8205TEGR2 Valeurs maximales et caractéristiques électriques
| Type de capteur | Digital Accelerometer (MEMS) |
| Number of Axes | 1 (X or Z selectable) |
| Full-Scale Range | ±50 g |
| Output Interface | SPI (Serial Peripheral Interface) |
| Tension d'alimentation | 6.3 V to 30 V |
| Température de fonctionnement | -40 °C to +125 °C (automotive) |
| Temperature Grade | Automotive |
| Boîtier | SOIC-16 (300 mil) |
| Type de montage | Surface Mount |
| Self-Test | Yes (integrated) |
| On-Chip Filtering | Yes (digital low-pass) |
| Statut RoHS | Compliant |
| Package Code | SOP / SOIC-16 |
| Surface Mount | Yes |
Configuration des broches de MMA8205TEGR2
| Broche 1 | VDD — Supply voltage (6.3 V to 30 V) |
| Broche 2 | GND — Ground |
| Broche 3 | NC — Not connected (per datasheet) |
| Broche 4 | CS — SPI chip select (active low) |
| Broche 5 | SCLK — SPI serial clock |
| Broche 6 | MISO — SPI master-in slave-out data |
| Broche 7 | MOSI — SPI master-out slave-in data |
| Broche 8 | ST — Self-test enable |
| Broche 9 | AXIS_SEL — X or Z axis select |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | NC — Not connected (per datasheet) |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | NC — Not connected (per datasheet) |
| Broche 15 | RESET — Device reset (active low) |
| Broche 16 | GND — Ground (thermal pad tie) |
Applications typiques
MMA8205TEGR2 convient pour 6 applications: Airbag Crash Sensor (Front Impact), Side-Impact Detection Module, Rollover Detection Sensor, Industrial Vibration / Impact Monitor, Seatbelt Pretensioner Trigger, Off-Road / Heavy Machinery Impact Alarm.
Airbag Crash Sensor (Front Impact)
The MMA8205TEGR2 is a front-impact airbag crash sensor whose ±50 g full-scale range directly matches the acceleration profiles generated during vehicle frontal collisions, which commonly exceed 20 g within the first 20 ms. According to NXP automotive airbag documentation, the integrated self-test verifies the MEMS element and signal chain at ECU end-of-line programming - it produces a defined digital output shift when the self-test pin is asserted, confirming both mechanical and electrical integrity. The wide 6.3 V to 30 V supply allows direct connection to the 12 V automotive battery without an external LDO, reducing BOM and PCB area. The SOIC-16 300-mil package withstands the standard automotive PCB assembly profile and reflow temperatures up to 260 °C. Use the part mounted on a rigid ECU sub-board with adequate strain relief at the connector to avoid vibration-induced false triggers in the deployment decision algorithm.
Recommandé
Side-Impact Detection Module
The MMA8205TEGR2 fits side-impact airbag modules where the door-mounted sensor must detect lateral crash pulses within a few milliseconds of impact initiation. Its ±50 g range covers door-intrusion events, which routinely exceed 30 g. The wide 6.3 V to 30 V supply operates directly from the vehicle battery, eliminating the need for a dedicated preregulator and saving PCB space in the cramped door-cavity ECU enclosure. According to NXP application guidance, the SOIC-16 300-mil package allows standard pick-and-place assembly and survives the -40 °C to +125 °C automotive temperature range required for door-mounted electronics. The integrated self-test exercises the MEMS element on every ECU power-up, providing a continuous health check critical for ISO 26262 ASIL-rated systems. Mount the sensor with its sensitive axis aligned to the vehicle lateral direction per OEM-specific calibration procedures.
Recommandé
Rollover Detection Sensor
The MMA8205TEGR2 serves as a high-g accelerometer inside a rollover detection ECU, where it works in concert with a low-g angular rate sensor to detect vehicle tilt and rollover events. Its ±50 g range covers the lateral accelerations seen during emergency maneuvers and rollover impacts. According to NXP system architecture documentation, the MMA8205TEGR2 SPI output is read by an automotive-grade MCU at sample rates compatible with rollover decision algorithms. The integrated digital filtering reduces high-frequency noise, simplifying the MCU-side signal processing and improving detection reliability. The SOIC-16 300-mil package has the mechanical ruggedness required for underbody ECU mounting where vibration levels are high. Combine with NXP's FXAS21002 gyroscope in systems requiring both angular rate and high-g linear acceleration sensing.
Recommandé
Industrial Vibration / Impact Monitor
The MMA8205TEGR2 is used in industrial vibration and impact monitoring applications such as pump protection, machinery health monitoring, and structural-impact detection. Its ±50 g full-scale range captures mechanical transients that exceed the range of typical industrial accelerometers. According to the NXP datasheet, the SPI interface simplifies integration with industrial PLCs and embedded controllers. The 6.3 V to 30 V supply allows operation directly from 24 V industrial control cabinets without additional power conditioning. The integrated self-test verifies sensor integrity on every power-up cycle, reducing field-maintenance labor for remote installations. The rugged SOIC-16 package and automotive-grade temperature range ensure reliable operation in factory automation environments where ambient temperatures fluctuate widely and vibration levels are elevated. Implement periodic self-test routines to detect sensor degradation over the equipment lifetime.
Recommandé
Seatbelt Pretensioner Trigger
The MMA8205TEGR2 triggers seatbelt pretensioner actuators in the milliseconds following a detected crash event, requiring high-g sensing and automotive-grade reliability. Its ±50 g range captures the deceleration profile of a moderate-to-severe frontal impact. According to NXP automotive safety application notes, the integrated self-test confirms sensor operability at every ignition-on cycle, a regulatory requirement for safety-critical systems. The wide 6.3 V to 30 V supply connects directly to the 12 V or 24 V automotive battery rail. The SPI output allows deterministic, low-latency communication with the safety MCU that drives the pretensioner FETs. The -40 °C to +125 °C automotive temperature range and SOIC-16 300-mil package meet the mechanical and environmental requirements for seatbelt ECU modules mounted under the seat or in the B-pillar.
Recommandé
Off-Road / Heavy Machinery Impact Alarm
The MMA8205TEGR2 detects high-impact events on construction, agricultural, and mining machinery where shock levels can exceed 30 g during normal operation and reach 50 g during fault events. Its wide supply range (6.3 V to 30 V) accepts both 12 V and 24 V machine batteries. According to NXP datasheet specifications, the integrated digital filtering rejects high-frequency vibration that would otherwise trigger false alarms, while preserving the impact signature in the passband. The SOIC-16 300-mil package withstands the high-vibration mechanical environment of heavy-equipment cabs and chassis. The integrated self-test is critical for equipment deployed in remote sites where sensor health cannot be manually verified. Combine with a wireless modem to relay impact events to a central fleet-management dashboard.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MMA8205TEGR2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MMA8205TEG | MMA8205LEGR2 | MMA8451Q |
|---|---|---|---|---|
| Package | SOIC-16 (300 mil) | SOIC-16 (300 mil) - same | SOIC-16 (300 mil) - same | QFN-16 - different |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Sensor Type | Single-axis accelerometer (X/Z) | Single-axis accelerometer (X/Z) | Single-axis accelerometer (X/Z) | 3-axis low-g accelerometer |
| Full-Scale Range | ±50 g | ±50 g | ±50 g | ±2 g / ±4 g / ±8 g |
| Supply Voltage | 6.3 V to 30 V | 6.3 V to 30 V | 6.3 V to 30 V | 1.95 V to 3.6 V |
| Output Interface | SPI | SPI | SPI | I2C / SPI |
| Self-Test | Yes (integrated) | Yes | Yes | No |
| Automotive Temperature Grade | -40 °C to +125 °C | -40 °C to +125 °C (industrial version) | -40 °C to +125 °C | -40 °C to +85 °C |
| Lifecycle Status | NRND | NRND | NRND | Active |
Principaux différenciateurs
- Wide 6.3 V to 30 V supply directly from automotive battery (vs MMA8451Q)
- ±50 g full-scale range matched to crash-pulse profiles (vs MMA8451Q)
- Integrated self-test for end-of-line verification (vs MMA8451Q)
Notes de conception
Place a 100 nF ceramic bypass capacitor as close as possible to the VDD pin (pin 1) and a 10 µF bulk capacitor on the supply rail to suppress automotive load-dump transients. The MMA8205TEGR2 accepts 6.3 V to 30 V directly from the 12 V automotive battery, but load-dump pulses can exceed 40 V - add a TVS diode (e.g., SMAJ33A) on the supply input for ECU protection. Estimated: at 6.3 V minimum supply and 5 mA quiescent current, the device dissipates approximately 31.5 mW - well within SOIC-16 thermal limits.
Route the SPI traces (SCLK, MISO, MOSI, CS) as short, matched-length signals and keep them away from switching power traces and motor drive lines. The SOIC-16 300-mil package provides adequate thermal mass for reflow assembly, but mechanical stress from PCB bending can shift the MEMS zero-g offset - mount the device on a rigid section of the PCB near its mounting screws. Use a four-layer PCB with a continuous ground plane beneath the sensor for EMI shielding and stable reference potential.
Do not confuse the MMA8205TEGR2 (high-g single-axis airbag sensor) with the MMA845x family (low-g multi-axis consumer accelerometer) - they have different packages, supply voltages, and SPI protocols. Always assert the self-test pin at ECU power-up to verify sensor integrity before enabling crash-deployment algorithms. Confirm the axis-select (AXIS_SEL) pin state matches your mechanical mounting orientation before production calibration. Verify AEC-Q100 qualification status with NXP for new automotive programs.
The MMA8205TEGR2 SPI bus operates at clock rates up to several MHz - keep trace lengths under 50 mm and add a 33 Ω series resistor on the SCLK output from the MCU to dampen reflections. Use a ground reference for all SPI signals and avoid routing over split power planes. The integrated digital low-pass filter attenuates high-frequency mechanical noise; additional MCU-side averaging may be needed if the host sample rate is significantly higher than the sensor output data rate.
Informations de conformité
RoHS compliance per distributor listings (DigiKey, LCSC). AEC-Q100 qualified per automotive temperature grade marking (-40C to +125C). Halogen-free status not specified in available data - marked unknown.
