MMA6281QT - ±2.5g-10g Two-Axis Low-g MEMS Accelerometer | NXP
N.º de pieza: MMA6281QT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $7.95 | $7,95 |
| 10 | $7.2 | $72,00 |
| 100 | $6.1 | $610,00 |
| 500 | $5.25 | $2.625,00 |
| 1.000 | $4.6 | $4.600,00 |
MMA6281QT Descripción general
A two-axis MEMS accelerometer is a sensor that measures static (gravity) and dynamic acceleration along two orthogonal axes using a suspended proof-mass structure whose capacitance changes with deflection. The MMA6281QT belongs to the accelerometer -> MEMS sensor -> inertial sensor -> sensor hierarchy, and serves as the lowest-level transducer that converts mechanical motion into an analog voltage proportional to acceleration. g-Select inputs allow a host microcontroller to dynamically trade sensitivity against measurement range without re-calibrating the analog front-end.
Key features include g-Select for four switchable sensitivities (±2.5g / ±3.3g / ±6.7g / ±10g), an integrated 1-pole low-pass filter for bandwidth limiting, on-chip temperature compensation, and a self-test pin for end-of-line verification. The device operates from a 2.2V to 3.6V analog supply, draws approximately 1.5 mA active current, and presents an analog ratiometric output centered at Vdd/2. Sleep mode reduces consumption to single-digit.
The MMA6281QT uses NXP's micromachined polysilicon surface-micromachined proof mass with capacitive sense elements and a switched-capacitor interface. This architecture yields excellent offset stability over temperature and predictable sensitivity scaling across the four selectable g-ranges, while keeping the BOM cost low for high-volume consumer and industrial products.
Typical applications include tilt and orientation detection in household white goods, free-fall detection in hard-disk drives and portable electronics, motion-activated user interfaces, vibration monitoring in industrial equipment, and inclination sensing in e-compass tilt compensation. The dual-axis X-Z measurement geometry is particularly useful for tilt/inclination measurement against gravity where one axis carries the primary tilt component and the other serves as a cross-check.
When designing with this part, place 0.1uF bypass capacitors adjacent to VDD and verify the g-Select logic levels against the host controller's output spec. For tilt applications, the analog output is ratiometric to VDD, so a stable analog supply (or ADC reference tied to VDD) is required for absolute accuracy. The internal 1-pole filter sets the bandwidth - add external filtering if the application demands tighter noise shaping.
This page synthesizes distributor pricing, drop-in alternatives, application guidance and design notes not found in the standalone manufacturer datasheet, providing an information-gain view of the MMA6281QT for engineers sourcing, evaluating and designing with this two-axis low-g accelerometer.
Alternativas directas para MMA6281QT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MMA6204Q
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MMA6261QT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MMA6262Q
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MMA6280QT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MMA6281QT Valores máximos y características eléctricas
| Tipo de sensor | Accelerometer |
| Sensor Axis | X-Z (two-axis) |
| Acceleration Range | ±2.5g / ±3.3g / ±6.7g / ±10g (g-Select) |
| Tipo de salida | Analog, ratiometric |
| Output Voltage (0g) | VDD/2 (nominal) |
| Supply Voltage (VDD) | 2.2 V to 3.6 V |
| Supply Current (active) | 1.5 mA (typical) |
| Temperatura de funcionamiento | -40 C to +105 C (industrial) |
| Encapsulado | 16-pin QFN (HQCCN) |
| Tipo de montaje | Surface Mount |
| Filter | Internal 1-pole low-pass |
| Características | g-Select (4 ranges), self-test, temperature compensation |
| Estado RoHS | Compliant |
| Lead Free | Yes |
Configuración de pines de MMA6281QT
| Pin 1 | VDD — Analog supply voltage (2.2 V to 3.6 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | X_OUT — X-axis analog acceleration output |
| Pin 4 | Z_OUT — Z-axis analog acceleration output |
| Pin 5 | g-Select1 — Sensitivity select input 1 |
| Pin 6 | g-Select2 — Sensitivity select input 2 |
| Pin 7 | ST — Self-test input |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| 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) |
Aplicaciones típicas
MMA6281QT es adecuado para 6 aplicacións: Tilt and Inclination Sensing, Free-Fall Detection in Portable Electronics, Motion-Activated User Interfaces, Appliance and White-Goods Tilt Detection, Industrial Vibration Monitoring, E-Compass Tilt Compensation.
Tilt and Inclination Sensing
The MMA6281QT's selectable low-g ranges (±2.5g / ±3.3g / ±6.7g / ±10g) and analog ratiometric output centered at VDD/2 make it well suited to tilt and inclination measurement. The two-axis X-Z geometry lets the host microcontroller resolve tilt angle on the primary axis using sin/cosine math while the second axis serves as a cross-check or as a redundant safety channel. Using g-Select, the engineer can switch to a lower range for fine tilt resolution in handheld devices or to a higher range when the device experiences vibration. The internal 1-pole low-pass filter attenuates mechanical noise without external RC components.
Recomendado
Free-Fall Detection in Portable Electronics
The MMA6281QT's wide-band two-axis sensing and integrated 1-pole low-pass filter suit free-fall detection in laptops, tablets and portable data-storage products. With g-Select set to ±2.5g, the device delivers the highest sensitivity for detecting the near-zero-g free-fall condition, allowing the host controller to park hard-disk heads or safeguard memory within milliseconds of drop initiation. The 2.2V-3.6V supply range is directly compatible with single-cell Li-ion powered platforms, removing the need for an external LDO. The exposed pad and QFN-16 footprint also provide good thermal dissipation for continuous operation.
Recomendado
Motion-Activated User Interfaces
The MMA6281QT is commonly deployed in motion-activated user interfaces such as remote controls, gesture pads and wearable accessories. Its selectable g-ranges let the firmware choose the appropriate sensitivity at power-on: ±10g for tap and shake detection, ±2.5g for slow tilt. The on-chip temperature compensation keeps the zero-g offset stable across typical indoor environments, while the integrated filter eases host MCU processing by attenuating high-frequency vibration noise. The QFN-16 package is small enough to fit into a remote control or wristband form factor.
Recomendado
Appliance and White-Goods Tilt Detection
In washing machines, refrigerators and other major home appliances, the MMA6281QT detects door state, drum imbalance and tilt events. The wide ±10g selectable range allows the controller to monitor both gentle tilt and high-impact events such as spin-cycle imbalance, while the -40 C to +105 C industrial temperature grade withstands the thermal environment inside an appliance cabinet. The RoHS-compliant, lead-free QFN package suits modern through-hole-reflow or selective-solder assembly processes used in appliance electronics.
Recomendado
Industrial Vibration Monitoring
The MMA6281QT's two-axis sensing and configurable bandwidth make it useful for low-frequency vibration monitoring in industrial equipment such as HVAC fans, pumps and small motors. Using g-Select to choose ±6.7g or ±10g, the device captures the dominant vibration components without saturating, while the integrated 1-pole low-pass filter rejects high-frequency switching noise from adjacent power electronics. The analog output drives a host ADC or external op-amp chain for FFT analysis or peak detection.
Recomendado
E-Compass Tilt Compensation
The MMA6281QT can be paired with a 3-axis magnetometer to implement tilt-compensated e-compass functions in handheld navigation devices. The two-axis X-Z accelerometer provides the pitch and roll angles that are subtracted from the magnetic flux vector to correct heading errors at non-horizontal orientations. Selecting ±2.5g or ±3.3g via g-Select gives the highest tilt resolution, and the ratiometric analog output is straightforward to digitize alongside the magnetometer's data-ready signal.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MMA6281QT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MMA6204Q | MMA6261QT | MMA6262Q | MMA6280QT |
|---|---|---|---|---|---|
| Package | QFN-16 (HQCCN) | QFN-16 (HQCCN) - same | QFN-16 (HQCCN) - same | QFN-16 (HQCCN) - same | QFN-16 (HQCCN) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Selectable g-Ranges | ±2.5g / ±3.3g / ±6.7g / ±10g (4 ranges) | ±1.5g / ±2g (2 ranges) | ±1.5g / ±2g (2 ranges) | Fixed ±1.5g / ±2g (no g-Select) | ±1.5g / ±2g / ±4g / ±6g (4 ranges) |
| Number of Axes | Two-axis (X-Z) | Two-axis (X-Z) | Two-axis (X-Z) | Two-axis (X-Z) | Two-axis (X-Z) |
| Output Type | Analog, ratiometric | Analog, ratiometric | Analog, ratiometric | Analog, ratiometric | Analog, ratiometric |
| 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 |
| Self-Test Pin | Yes | Yes | Yes | Yes | Yes |
| 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 |
| RoHS / Lead-Free | Yes | Yes | Yes | Yes | Yes |
Diferenciadores clave
- Four-range g-Select with widest low-g span (frente a MMA6204Q)
- More sensitivity options than fixed-range siblings (frente a MMA6262Q)
- Higher full-scale ceiling than same-package MMA6280QT (frente a MMA6280QT)
Notas de diseño
Place a 0.1uF ceramic bypass capacitor as close as possible to the VDD pin and connect the exposed pad (EP) to a clean ground plane with multiple thermal vias for stable supply rejection and thermal dissipation. Route X_OUT and Z_OUT traces away from switching power traces and noisy digital lines; keep the traces short and matched in length if both are sampled simultaneously to minimize timing skew. Avoid placing large decoupling or ferrite components directly over the sensor die area to prevent mechanical stress on the package.
The MMA6281QT output is ratiometric to VDD, so the host ADC reference should be tied to the same VDD rail to cancel VDD drift in the measurement. A stable low-noise LDO (or direct battery rail in low-power applications) is preferred over a noisy switching regulator. When sharing a 3.3V rail with digital logic, place a ferrite bead and additional bulk capacitance in series with the digital supply segment feeding the sensor.
The internal 1-pole low-pass filter attenuates high-frequency mechanical noise but does not remove 50/60 Hz mains hum or broadband digital switching noise; add an external RC filter on X_OUT and Z_OUT if the application demands a tighter noise floor. Drive the host ADC input with a low-impedance buffer if the ADC reference impedance is high, and oversample then average to extract sub-LSB resolution. Calibrate zero-g offset at production using a known orientation fixture.
Do not drive g-Select1/g-Select2 with floating signals - tie them to VDD or GND through a defined logic level or the device may enter an undefined state at power-up. Verify self-test pulse timing and amplitude against the datasheet before using self-test as a production go/no-go check. The exposed pad is the primary thermal path and must be soldered; failure to do so degrades thermal performance and can shift the zero-g offset. Finally, confirm the pinout against the specific package datasheet revision before PCB layout - the QFN pad assignment differs from earlier QFP packages in the same family.
Información de cumplimiento
RoHS compliant and lead-free per DigiKey and NXP product page. Industrial temperature grade -40 C to +105 C. Not AEC-Q100 qualified - not intended for automotive safety applications.
