MMA7261Q - ±2.5/3.3/6.7/10g 3-Axis Accelerometer | NXP
N.º da peça: MMA7261Q ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.95 | $6,95 |
| 10 | $6.2 | $62,00 |
| 100 | $5.55 | $555,00 |
| 500 | $4.95 | $2.475,00 |
| 1.000 | $4.45 | $4.450,00 |
MMA7261Q Visão geral
An accelerometer is a MEMS (micro-electro-mechanical systems) sensor that measures proper acceleration along one or more axes and produces an electrical output proportional to the sensed force. The MMA7261Q belongs to the capacitive-sensing family of accelerometers (sibling to piezo-resistive types) in which a proof mass shifts relative to fixed capacitive plates under acceleration, converting deflection into a differential capacitance that the on-chip ASIC amplifies and outputs as an analog voltage. In the broader taxonomy it sits under motion sensors -> inertial sensors -> MEMS accelerometers -> semiconductor sensor ICs.
Key features include a 1-pole low-pass filter on each axis, on-chip temperature compensation to stabilize zero-g offset over -20 °C to +85 °C, a low-current Sleep Mode that drops consumption below 3 µA, and lead-free RoHS-compliant construction. The internal signal-conditioning ASIC drives a ratiometric analog output that scales with VDD, simplifying ADC interfacing on 3.3 V microcontrollers. The g-Select inputs (g-Select1, g-Select2) let the system trade dynamic range for resolution at runtime - useful for orientation detection that must remain accurate under both gentle motion and drop events.
Architecturally, the MMA7261Q uses a polysilicon surface-micromachined structure with a sealed cavity over the proof mass, paired with a chopper-stabilized gain stage that minimizes 1/f noise and temperature drift. The X and Y axes share one pair of capacitance plates per axis, while the Z axis uses a separate through-wafer structure, which accounts for its lower nominal bandwidth. The output is specified at the factory over temperature and laser-trimmed for sensitivity and zero-g offset.
Typical applications include tilt and orientation sensing in portable consumer electronics, hard-disk drive free-fall detection, gaming motion controllers, activity monitoring in fitness wearables, and anti-theft motion alarms. The wide dynamic range also suits industrial vibration monitoring on rotating equipment and shipping-condition monitoring in logistics tags. When designing with the MMA7261Q, place decoupling capacitors within 3 mm of VDD, keep the analog outputs away from switching nodes to preserve SNR, and add a 10 kΩ series resistor on each analog output if driving long cables.
This page synthesizes distributor pricing, same-family NXP drop-in alternatives such as MMA7260Q, MMA7361L, and MMA7455L (same QFN-16 footprint or close pad-compatible variants), cross-brand MEMS accelerometer alternatives, and practical design notes not found in the original Freescale datasheet, organized specifically for engineers searching for a drop-in replacement or new design entry point.
Alternativas drop-in para MMA7261Q — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MMA7261Q (mesmo formato e footprint) — diferindo em Output Type, Package, Sensor Type, RoHS Status, Acceleration Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MMA7260Q
✅ Drop-In✓ Em estoque
$4.75 / unidade
Ver ficha técnica →MMA7260QT
✅ Drop-In✓ Em estoque
$3.25 / unidade
Ver ficha técnica →MMA7261QT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MMA7261QR2
✅ Drop-In✓ Em estoque
$3.62 / unidade
Ver ficha técnica →MMA7261Q Classificações máximas e características elétricas
| Tipo de sensor | 3-axis accelerometer (X, Y, Z) |
| Sensing Technology | Capacitive MEMS |
| Selectable Acceleration Range | ±2.5g / ±3.3g / ±6.7g / ±10g |
| Supply Voltage Range | 2.2 V to 3.6 V |
| Supply Current (operating) | 500 µA typical |
| Sleep Mode Current | < 3 µA typical |
| Tipo de saída | Analog, ratiometric with VDD |
| X-axis Bandwidth | 350 Hz |
| Y-axis Bandwidth | 350 Hz |
| Z-axis Bandwidth | 150 Hz |
| Sensitivity (g-Select modes) | Configurable via g-Select1 / g-Select2 pins |
| Filter | 1-pole low-pass on each axis |
| Zero-g Offset Temperature Coefficient | ±0.5 %FS typical (per datasheet) |
| Faixa de temperatura de operação | -20 °C to +85 °C |
| Encapsulamento | 16-QFN, 6 mm × 6 mm × 1.45 mm |
| Status RoHS | Compliant |
| Lead-Free Status | Lead Free |
| Tipo de montagem | Surface Mount |
Configuração de pinos do MMA7261Q
| Pino 1 | VDD — Power supply input, 2.2 V to 3.6 V |
| Pino 2 | g-Select2 — Range-select logic input 2 (see g-Select truth table) |
| Pino 3 | g-Select1 — Range-select logic input 1 (see g-Select truth table) |
| Pino 4 | Sleep — Logic high = Sleep Mode, low = active operation |
| Pino 5 | N/C — Reserved (test pin per datasheet, do not connect) |
| Pino 6 | N/C — Reserved (test pin per datasheet, do not connect) |
| Pino 7 | N/C — Reserved (test pin per datasheet, do not connect) |
| Pino 8 | GND — Common ground return for VDD and analog outputs |
| Pino 9 | N/C — Not connected (per datasheet) |
| Pino 10 | N/C — Not connected (per datasheet) |
| Pino 11 | Zout — Z-axis analog output, 150 Hz bandwidth, ratiometric with VDD |
| Pino 12 | Yout — Y-axis analog output, 350 Hz bandwidth, ratiometric with VDD |
| Pino 13 | Xout — X-axis analog output, 350 Hz bandwidth, ratiometric with VDD |
| Pino 14 | N/C — Not connected (per datasheet) |
| Pino 15 | N/C — Not connected (per datasheet) |
| Pino 16 | VDD — Power supply input (tie to pin 1 on PCB) |
Aplicações típicas
MMA7261Q é adequado para 6 aplicaçãos: Tilt and Orientation Sensing in Mobile Devices, Hard-Disk Drive Free-Fall Detection, Gaming and Motion Controller Input, Fitness and Activity Monitoring Wearables, Anti-Theft and Security Motion Alarms, Industrial Vibration Monitoring of Rotating Equipment.
Tilt and Orientation Sensing in Mobile Devices
The MMA7261Q measures gravity projection on X, Y, and Z axes with selectable ±2.5g to ±10g dynamic range, making it well suited to handheld tilt and orientation detection. In ±2.5g mode with a 3.3 V supply, full-scale output is roughly ±1.65 V around the VDD/2 = 1.65 V zero-g bias, giving about 666 mV per g of tilt and a 14-bit ADC can resolve sub-degree pitch/roll. Unlike digital-output MEMS ICs the MMA7261Q keeps MCU wakeups low by allowing direct analog threshold comparators for screen-rotation events, saving 10-50 mW of MCU computation. A 0.1 µF ceramic decoupling capacitor must be placed within 3 mm of VDD per Freescale application guidance. The 16-QFN footprint (6 × 6 mm) sits comfortably next to a power-management IC in a 50 mm × 25 mm cellphone PCB.
Recomendado
Hard-Disk Drive Free-Fall Detection
The MMA7261Q's selectable sensitivity modes including ±10g allow hard-disk drive electronics to detect free-fall events of 500-800 ms duration and park the read/write heads before impact. With 350 Hz X/Y bandwidth and 150 Hz Z bandwidth the MMA7261Q catches the low-frequency acceleration signature of a falling laptop without aliasing the 5-15 Hz vibration of an impact event. Switching from ±2.5g to ±10g via g-Select logic just before the expected drop event preserves ADC resolution (15 mV/g vs 60 mV/g) and avoids saturating the analog output. The 500 µA typical operating current is acceptable for battery-powered applications, and the < 3 µA Sleep Mode current lets the HDD controller gate the part off when the disk is idle to extend battery life by 30-40 %.
Recomendado
Gaming and Motion Controller Input
The MMA7261Q provides triple-axis analog acceleration with the ±6.7g or ±10g sensitivity selected via g-Select for capturing the full dynamic range of hand and body motion in gaming controllers. The 350 Hz analog bandwidth on X and Y axes captures the 50-200 Hz spectral content of quick wrist flicks, while the lower 150 Hz Z-axis bandwidth is more than adequate for capturing the 5-20 Hz limb-swing spectral signature of movement cues. Latency from accelerometer to analog output pin is sub-millisecond, which is critical for real-time gesture control loops running at 100 Hz update rate. The 6 × 6 mm QFN-16 footprint and 1.45 mm package height drop directly into the MCU cluster of a wireless gamepad PCB. Compared to the analog MMA7261Q, newer digital-output parts like MMA8451Q reduce MCU ADC load but require extra firmware development.
Recomendado
Fitness and Activity Monitoring Wearables
The MMA7261Q is used in early-generation fitness bands and pedometers to count steps and detect activity intensity using ±2.5g or ±3.3g modes. Its 350 Hz X/Y bandwidth captures the 1-3 Hz step-cadence spectral peaks without aliasing, and the analog outputs feed a low-power MCU ADC running at 25-50 Hz with ODR software averaging. The < 3 µA Sleep Mode current lets the activity monitor stay on a single coin-cell battery for 6-12 months by waking the MCU only when motion exceeds a comparator threshold tied to the Xout or Yout pin. Although newer parts like MMA9555L (built-in pedometer state machine) replace this MCU + accelerometer architecture, the MMA7261Q remains useful for cost-sensitive wearables. A 10 kΩ series resistor on each analog output isolates the MEMS from RF noise coupled through the body-worn antenna.
Recomendado
Anti-Theft and Security Motion Alarms
Anti-theft motion alarms and asset-tamper detectors use the MMA7261Q to monitor the orientation and vibration profile of valuable equipment when unattended. With selectable sensitivity modes, the alarm system can use ±2.5g to detect gentle tilting of artwork or a laptop but switch to ±10g to capture the high-energy shock of forced entry or a hammer strike. The 1-pole low-pass filter on each axis suppresses RF interference from nearby walkie-talkies or cellphones. The exposed-pad QFN-16 package provides stable thermal coupling to the housing so the zero-g offset stays within the ±0.5 %FS temperature coefficient across the -20 °C to +85 °C industrial range. A 0.1 µF decoupling capacitor close to the supply pin and a 1 µF tantalum bulk capacitor on the host 3.3 V rail is recommended by Freescale for alarm installations near noisy motors.
Recomendado
Industrial Vibration Monitoring of Rotating Equipment
The MMA7261Q handles industrial vibration monitoring on motors, pumps, and fans with frequency content up to 350 Hz. The ±10g range covers the typical 5-10 g RMS vibration levels found on consumer-grade rotating equipment before bearing failure. Its 1-pole low-pass filter and chopper-stabilized signal conditioning reduce 1/f noise and temperature drift to ±0.5 %FS, which is critical for trend analysis over multi-year deployments in plants. The exposed thermal pad of the 16-QFN package allows direct heat-sinking to the equipment chassis, keeping junction temperature within the -20 °C to +85 °C operating range even in enclosed industrial cabinets. Compared to industrial-grade piezoelectric vibration sensors, the MMA7261Q consumes only 500 µA and can be powered from a single 3.3 V PLC output, eliminating the need for charge amplifier circuits.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MMA7261Q — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MMA7260Q | MMA7260QT | MMA7261QT | MMA7261QR2 |
|---|---|---|---|---|---|
| Package | 16-QFN (6 × 6 mm × 1.45 mm) | 16-QFN (6 × 6 mm × 1.45 mm) - same | 16-QFN (6 × 6 mm × 1.45 mm) - same | 16-QFN (6 × 6 mm × 1.45 mm) - same | 16-LQFN Exposed Pad - same footprint |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP USA Inc. |
| Selectable Acceleration Range | ±2.5g / ±3.3g / ±6.7g / ±10g (g-Select) | ±1.5g (fixed, no g-Select) | ±1.5g (fixed, no g-Select) | ±2.5g / ±3.3g / ±6.7g / ±10g (g-Select) - identical | ±2.5g / ±3.3g / ±6.7g / ±10g (g-Select) - identical |
| Supply Voltage Range | 2.2 V to 3.6 V | 2.2 V to 3.6 V - same | 2.2 V to 3.6 V - same | 2.2 V to 3.6 V - same | 2.2 V to 3.6 V - same |
| Supply Current (operating) | 500 µA typical | 500 µA typical - same | 500 µA typical - same | 500 µA typical - same | 500 µA typical - same |
| Sleep Mode Current | < 3 µA typical | < 3 µA typical - same | < 3 µA typical - same | < 3 µA typical - same | < 3 µA typical - same |
| X/Y Axis Bandwidth | 350 Hz | 350 Hz - same | 350 Hz - same | 350 Hz - same | 350 Hz - same |
| Z Axis Bandwidth | 150 Hz | 150 Hz - same | 150 Hz - same | 150 Hz - same | 150 Hz - same |
| Sensitivity at 3.3 V (±2.5g mode) | 480 mV/g typical | 800 mV/g (±1.5g) | 800 mV/g (±1.5g) | 480 mV/g - identical | 480 mV/g - identical |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete (variant of MMA7261Q) | Obsolete |
Principais diferenciais
- Four user-selectable sensitivity ranges via g-Select logic (vs MMA7260Q)
- 350 Hz X/Y bandwidth with selectable ±10g dynamic range (vs MMA7361L)
- Same QFN-16 (6x6 mm) package as the predecessor family (vs MMA8451Q)
Notas de projeto
Decouple VDD with a 0.1 µF X7R ceramic capacitor placed within 3 mm of pin 1 (and pin 16 which is tied to VDD internally) following the Freescale/NXP reference layout. Add a 1 µF tantalum or 10 µF ceramic bulk capacitor on the 3.3 V rail within 10 mm. Place the analog Xout/Yout/Zout traces over a continuous ground plane, away from switching nodes and high-impedance digital lines. The exposed thermal pad of the 16-QFN must be soldered to a 4 mm × 4 mm copper pad connected to ground for mechanical stability and to keep junction-to-ambient thermal resistance within datasheet bounds.
Insert a 10 kΩ series resistor in series with each of Xout, Yout, and Zout when driving PCB traces longer than 50 mm. The series resistor isolates the MEMS output stage from the capacitive load of the trace + ADC input pin capacitance (typically 8-12 pF), which would otherwise form an RC pole that drops the 350 Hz X/Y bandwidth below the datasheet spec. For best noise performance, add a 1 nF to 10 nF capacitor between each analog output and ground close to the ADC pin to form an RC anti-aliasing filter at roughly 1.6 kHz corner. ESD: the analog outputs are sensitive to ±2 kV HBM ESD strikes during handling.
Do not connect the N/C pins (pins 5, 6, 7, 9, 10, 14, 15) to anything except high impedance - they are internal test points reserved for the Freescale production test, and pulling them externally can disturb the zero-g offset calibration. The g-Select1 and g-Select2 logic levels are VDD-relative; never drive them from a 5 V MCU on a 3.3 V supply or you will overstress the input clamp diodes (typical absolute max is VDD + 0.3 V). Sleep Mode current drops below 3 µA only when Sleep is driven logic-high cleanly, not with a 100 kΩ pull-up resistor that may allow leakage. Do not exceed 3000 g mechanical shock - the MEMS proof mass stops are not designed for drop events beyond absolute max specification.
Informações de conformidade
RoHS compliance and lead-free status confirmed from DigiChip specifications page. REACH, AEC-Q100, halogen-free, and conflict mineral status not published in the Freescale/NXP datasheet; additional compliance certificates are not included with the obsolete product record.
