MMA6281QR2 - ±2.5/10g Two-Axis Low-g Accelerometer | 16-QFN
Référence : MMA6281QR2 ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.95 | $4,95 |
| 10 | $4.2 | $42,00 |
| 100 | $3.45 | $345,00 |
| 500 | $2.95 | $1 475,00 |
| 1 000 | $2.6 | $2 600,00 |
MMA6281QR2 Présentation
An accelerometer (also called a g-sensor) is a micro-electromechanical (MEMS) sensor that measures proper acceleration along one or more axes. It belongs to the motion sensor family within the broader sensor hierarchy: accelerometer -> motion sensor -> MEMS -> semiconductor IC. Because MMA6281Q is a low-g part it is used to sense tilt, vibration and shock events, not high-shock impacts. Two-axis X+Z variants such as this part suit horizontal board-mount or front-panel mounts where pitch plus yaw must be measured simultaneously.
Key features of the MMA6281QR2 include four selectable sensitivity ranges, integrated temperature compensation, monolithic signal conditioning, and a 1-pole low-pass filter for bandwidth limiting. The 16-QFN QFN package is reflow-compatible and supports standard surface-mount assembly, and the exposed pad aids thermal dissipation and mechanical stability of the die. The analog ratiometric output drives an external ADC directly, simplifying MCU integration. The g-Select pin allows software or hardware reconfiguration of full-scale range without changing the hardware.
MMA6281QR2 architecture is a surface-micromachined capacitive sensing element combined with a CMOS signal-chain ASIC; motion-induced differential capacitance change is unconverted to a voltage proportional to acceleration. The ratiometric analog output simplifies ADC calibration because the zero-g offset and sensitivity scale with the supply voltage. g-Select allows two sensitivity pairs (2.5/3.3 g and 6.7/10 g) selectable per axis, trading dynamic range against resolution at runtime.
Typical applications of MMA6281QR2 include HDD free-fall detection (laptop drop protection), portable consumer tilt and orientation sensing, anti-theft / motion alarm units, vibration monitoring in industrial appliances, and human-machine interface pointing devices. Designers select this part for cost-sensitive multi-axis motion detection where digital output is not required and an external MCU with ADC is present.
When designing with this device, place 0.1 microF decoupling on VDD close to the pin and follow the land-pattern recommendations in the QFN package drawing. The exposed pad must be soldered to the board ground pour for thermal and mechanical integrity. Confirm that the selected g-range covers the application's worst-case acceleration including margin.
This page synthesizes distributor availability, drop-in package alternatives in the same 16-QFN QFN family, and design guidance drawn from the Freescale/NXP datasheet and application notes - information not aggregated on a single distributor page.
Alternatives de remplacement direct pour MMA6281QR2 — 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 :
MMA6280QT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6282QT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6260QT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6261QT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6262QT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6281QR2 Valeurs maximales et caractéristiques électriques
| Type de capteur | Accelerometer, 2-axis (X, Z) |
| Sensing Axis | X, Z |
| Acceleration Range | ±2.5 g, ±3.3 g, ±6.7 g, ±10 g (selectable) |
| Sensitivity (mV/g) | 480 mV/g (±2.5 g) to 120 mV/g (±10 g) |
| Bandwidth X-axis | 350 Hz |
| Bandwidth Z-axis | 150 Hz |
| Type de sortie | Analog Voltage (ratiometric) |
| Supply Voltage (VDD) | 2.2 V to 3.6 V |
| Boîtier | 16-QFN (HQCCN), 6 x 6 mm |
| Type de montage | Surface Mount |
| Filter | 1-pole low-pass, integrated |
| g-Select | Yes (4 sensitivity ranges) |
| Temperature Compensation | Integrated |
| Température de fonctionnement | -40 °C to +105 °C |
| Statut RoHS | Compliant |
| Part Status | Obsolete |
Configuration des broches de MMA6281QR2
| Broche 1 | VDD — Power supply input (2.2 V to 3.6 V) |
| Broche 2 | g-Select — Logic input to select sensitivity range pair (low = ±2.5/3.3 g, high = ±6.7/10 g) |
| Broche 3 | NC — Not connected (per datasheet) |
| Broche 4 | NC — Not connected (per datasheet) |
| Broche 5 | NC — Not connected (per datasheet) |
| Broche 6 | NC — Not connected (per datasheet) |
| Broche 7 | NC — Not connected (per datasheet) |
| Broche 8 | GND — Ground reference |
| Broche 9 | Zout — Z-axis analog output voltage |
| 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 | Xout — X-axis analog output voltage |
| Broche 16 | NC — Not connected (per datasheet) |
Applications typiques
MMA6281QR2 convient pour 6 applications: HDD Free-Fall Detection in Laptop Drop Protection, Tilt and Orientation Sensing in Consumer Electronics, Anti-Theft and Motion Alarm Devices, Vibration Monitoring in Industrial Appliances, Human-Machine Interface Pointing Devices, Appliance and Equipment Tilt Protection.
HDD Free-Fall Detection in Laptop Drop Protection
MMA6281QR2 is well suited to HDD free-fall detection circuits in laptops and portable storage devices. The ±2.5 g low-sensitivity g-Select setting combined with the 350 Hz X-axis analog bandwidth detects the small gravity/acceleration shift that occurs the instant a laptop begins to fall, giving the HDD firmware several milliseconds to park the heads before impact. The 16-QFN 6 x 6 mm footprint fits inside typical HDD bracket keep-out areas, and the ratiometric analog output is read by the storage controller's ADC. Compared with a switch-based shock sensor, MMA6281QR2 offers continuously variable thresholds via g-Select and lower false-trigger rates.
Recommandé
Tilt and Orientation Sensing in Consumer Electronics
MMA6281QR2 suits consumer tilt and orientation products such as remote controls, e-readers, point-of-sale terminals, and small appliances where the device must report its orientation to the host. The X+Z combination gives pitch plus roll-out information for front-panel mounting, while the 480 mV/g sensitivity at ±2.5 g resolves sub-degree tilt changes when read by a 10-bit ADC. Its 2.2 V to 3.6 V supply matches coin-cell or USB-powered rails without a level shifter. Compared with digital I²C accelerometers, MMA6281QR2's analog output requires only one ADC channel per axis and avoids I²C address conflicts in multi-sensor systems.
Recommandé
Anti-Theft and Motion Alarm Devices
MMA6281QR2 suits battery-powered anti-theft devices and motion alarm sensors because its 2.2 V to 3.6 V supply draws microamp-level quiescent current and wakes a low-duty-cycle MCU when motion is detected. The four selectable g-Select ranges let one PCB serve multiple product SKUs with different motion sensitivities without BOM changes. According to the manufacturer datasheet, the integrated 1-pole low-pass filter limits high-frequency vibration noise that would otherwise false-trigger the alarm. Compared with a piezo shock sensor, MMA6281QR2 provides directional information and a wider dynamic range across product variants.
Recommandé
Vibration Monitoring in Industrial Appliances
MMA6281QR2 fits vibration monitoring modules in white goods, HVAC equipment, and small industrial appliances that need to detect imbalance, blockage, or stall conditions. The 350 Hz X-axis bandwidth captures vibration signatures from motor bearings and pump impellers, and the ratiometric analog output feeds an RMS calculation in the host MCU. Its -40 °C to +105 °C operating range covers most appliance and light-industrial environments. Compared with a discrete piezo vibration sensor, MMA6281QR2 integrates temperature compensation, eliminating the drift compensation firmware otherwise required.
Recommandé
Human-Machine Interface Pointing Devices
MMA6281QR2 supports tilt-based pointing devices such as remote controls, game controllers, and wearable input devices where two-axis (forward/backward plus up/down tilt) gestures translate to cursor or selection actions on a paired host. The 480 mV/g sensitivity at ±2.5 g gives fine gesture resolution, and the 150 Hz Z-axis bandwidth matches typical gesture dynamics. The 16-QFN 6 x 6 mm package is small enough for wearable form factors while leaving room for a coin-cell battery. Compared with optical or gyroscope-based pointing, MMA6281QR2 is significantly lower cost and lower power.
Recommandé
Appliance and Equipment Tilt Protection
MMA6281QR2 suits tilt-protection circuits in lifts, scissor jacks, mobile equipment, and medical carts that must cut power or sound an alarm when the device tilts beyond a safe angle. The X-axis analog output drives a comparator in the host MCU, while the Z-axis output provides a redundant gravity reference to reject false triggers from vibration. The selectable ±2.5 g to ±10 g ranges accommodate a wide range of products from surgical tables to industrial scissor lifts. Compared with mercury or mechanical tilt switches, MMA6281QR2 has no moving hazardous materials and provides a proportional output for soft cutoff curves.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MMA6281QR2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MMA6280QT | MMA6282QT | MMA6260QT | MMA6261QT | MMA6262QT |
|---|---|---|---|---|---|---|
| Package | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same | 16-QFN (6x6 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Sensing Axes | X, Z | X, Z | X, Z | X, Y | X, Y | X, Y |
| Acceleration Range | ±2.5/3.3/6.7/10 g | ±1.5/2/4/6 g | ±3/4.5/9/12 g | ±1.5/2/4/6 g | ±2.5/3.3/6.7/10 g | ±3/4.5/9/12 g |
| Sensitivity at Lowest g | 480 mV/g at ±2.5 g | 800 mV/g at ±1.5 g | 400 mV/g at ±3 g | 800 mV/g at ±1.5 g | 480 mV/g at ±2.5 g | 400 mV/g at ±3 g |
| X-axis Bandwidth | 350 Hz | 350 Hz | 350 Hz | 350 Hz | 350 Hz | 350 Hz |
| Z-axis Bandwidth | 150 Hz | 150 Hz | 150 Hz | 150 Hz (Y-axis) | 150 Hz (Y-axis) | 150 Hz (Y-axis) |
| Supply Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V |
| Output Type | Analog voltage (ratiometric) | Analog voltage (ratiometric) | Analog voltage (ratiometric) | Analog voltage (ratiometric) | Analog voltage (ratiometric) | Analog voltage (ratiometric) |
Principaux différenciateurs
- Selectable g-range allows one PCB to serve multiple product SKUs (vs MMA6280QT)
- Lower high-end g-range ceiling simplifies clean drops without firmware scaling (vs MMA6282QT)
- X+Z axes match horizontal-mount and front-panel applications (vs MMA6261QT)
Notes de conception
Place a 0.1 microF decoupling capacitor as close as possible to the VDD pin (pin 1) and route it directly to a clean ground via the exposed pad. The MMA6281QR2 analog signal chain is sensitive to VDD ripple; per the Freescale datasheet, supply noise couples directly into the ratiometric output. For designs powered from a switching regulator, add a ferrite bead or L-C filter between the regulator and VDD to keep output noise below the application's threshold.
Solder the exposed thermal pad (EP) to a solid ground plane to provide the mechanical anchor the silicon needs. Per the Freescale QFN package drawing, an unsoldered pad allows the die to flex under shock, producing offset drift and noise spikes. Use at least 5 ground vias in the EP thermal land to the inner ground plane and follow the manufacturer's stencil aperture recommendations for reliable solder joint formation during reflow.
Route the Xout and Zout analog traces over a continuous ground plane and away from switching converter nodes, clock lines, and high-current traces. Per the datasheet, the analog outputs are low-impedance but still benefit from short, guarded traces. Add a small RC low-pass filter (10 kHz or below) at the host ADC input if the application needs to reject high-frequency vibration noise beyond the internal 1-pole filter.
Do not float the g-Select pin: leave it tied to VDD or GND through a 100 kohm resistor or drive it from a GPIO. A floating g-Select may randomly toggle between the two range pairs. Also, do not power the MMA6281QR2 above 3.6 V - the analog output saturates and the ratiometric calibration becomes invalid. Use the host MCU's ADC reference tied to the same VDD to preserve ratiometric accuracy.
MMA6281QR2's operating temperature range is -40 °C to +105 °C per the Freescale datasheet, and its quiescent current is well below 1 mA, so self-heating is negligible. The exposed pad provides adequate thermal dissipation in normal operation. In enclosed housings with no airflow, ensure the case temperature stays below 85 °C to preserve zero-g offset drift specifications across the full operating envelope.
Informations de conformité
RoHS and lead-free per Freescale/NXP product page. Halogen-free status not explicitly listed in the verified data - marked unknown. Not AEC-Q100 qualified - this is a consumer/industrial-grade sensor, not automotive-grade.
