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NXP Semiconductors MMA1270KEGR2
- Part No.:
- MMA1270KEGR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA1270KEGR2.pdf
- Description:
- ACCELEROMETER 2.5G ANALOG 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,993
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Product details
Overview
MMA1270KEGR2 from NXP Semiconductors (formerly Freescale) is a ±2.5g single-axis z-axis micromachined capacitive accelerometer with integrated signal conditioning, 2nd-order Bessel low-pass filter, and factory-calibrated self-test. It delivers ratiometric linear output (750 mV/g typical), operates from 4.75–5.25 V, draws 2.1 mA typical, and is qualified to AEC-Q100 Grade 2 (−40°C to +105°C) for automotive and industrial vibration monitoring.
For engineers reviewing the MMA1270KEGR2 datasheet, MMA1270KEGR2 pinout, MMA1270KEGR2 application, or MMA1270KEGR2 equivalent, key selection considerations include its SOIC-16 package with redundant ground pins, self-test voltage response (ΔVST = 0.9–1.25 V), status fault latch behavior, and 40–60 Hz −3 dB bandwidth suitable for mechanical bearing monitoring and hard drive protection.
Technical Context
The MMA1270KEGR2 implements a surface-micromachined polysilicon g-cell paired with a CMOS ASIC using switched-capacitor techniques to measure differential capacitance changes. Its signal path includes integrator, gain stage, temperature-compensated trim, and a 2-pole Bessel filter clocked at ≈70 kHz - eliminating external RC components while preserving pulse shape integrity.
Self-test is activated via logic-high ST pin, applying electrostatic force to deflect the movable plate; the resulting output shift (measured at VOUT) verifies both mechanical transducer and electronic signal chain integrity. Fault detection monitors EPROM parity and latches high on odd parity via STATUS pin, resettable only by ST rising edge if no persistent fault exists.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | ±2.5g - full-scale range optimized for low-g vibration and motion sensing in appliances and input devices. |
| Sensitivity | 750 mV/g typical - enables direct interface with 10-bit+ ADCs without amplification in 5 V systems. |
| Bandwidth (−3 dB) | 40–60 Hz - Bessel-filtered response minimizes phase distortion for accurate time-domain waveform capture. |
| Supply Voltage | 4.75–5.25 V - narrow regulated range ensures factory calibration validity; operation outside invalidates accuracy. |
| Supply Current | 2.1 mA typical - supports low-power embedded systems with sustained analog output capability. |
| Operating Temp | −40°C to +105°C - AEC-Q100 Grade 2 qualification confirms reliability in under-hood automotive and industrial environments. |
| Noise Density | 700 μg/√Hz - defines resolution limit for detecting sub-10 mg acceleration events in quiet mechanical systems. |
Pinout & Package
Package: 16-lead SOIC (Case 475-01), Pb-free (KEG suffix), tape-and-reel packaging (R2 suffix). Dimensions per Freescale Issue C drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 7 | VSS | Redundant ground connections - improve noise immunity and thermal dissipation; may be left unconnected but recommended for PCB grounding. |
| 4 | VOUT | Analog output voltage (ratiometric to VDD) - directly interfaces to ADC inputs; requires 1 kΩ + 0.1 μF RC filter to suppress 70 kHz clock feedthrough. |
| 5 | STATUS | Open-drain fault indicator - latches high on EPROM parity error; driven high during self-test; reset by ST rising edge. |
| 6 | VDD | Primary power supply input - must be decoupled with 0.1 μF capacitor placed near pin to stabilize internal oscillator and filter. |
| 8 | ST | Active-high self-test trigger - initiates calibrated electrostatic deflection; internal pull-down prevents false activation from board leakage. |
| 9–13 | Trim | Factory-programmed EPROM trim connections - no user access; must remain unconnected in circuit. |
| 14–16 | N/C | No internal connection - floating per recommendation; no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic wafer-level seal | Prevents moisture and particle ingress into g-cell cavity, ensuring long-term zero-g offset stability in humid or dusty environments. |
| Calibrated self-test | Generates known output shift (0.9–1.25 V) verifying end-to-end functionality - critical for safety-critical systems like airbag diagnostics. |
| EPROM parity check | Hardware-monitored memory integrity - STATUS pin asserts on corrupted trim data, enabling field-detectable failure mode identification. |
| Transverse sensitivity ≤5% FSO | Rejects off-axis acceleration interference - maintains accuracy when mounted near rotating machinery or multi-axis vibration sources. |
| AEC-Q100 Grade 2 qualification | Validated for automotive under-hood use - guarantees parametric performance across −40°C to +105°C without derating. |
Applications
| Vibration Monitoring and Recording | Computer Hard Drive Protection |
|---|---|
Use Scenario: Continuous measurement of motor housing vibration in HVAC compressors to detect bearing wear before catastrophic failure. IC Role / Device Role / Timing Role: Z-axis accelerometer providing analog voltage proportional to axial acceleration magnitude and direction. Use Value: Enables predictive maintenance algorithms using RMS acceleration values below 60 Hz - matched precisely by the device's Bessel-filtered 40–60 Hz bandwidth. | Use Scenario: Detecting free-fall events in laptop computers to park read/write heads before impact. IC Role / Device Role / Timing Role: Low-latency z-axis motion detector triggering head retraction within <25 ms of drop initiation. Use Value: Self-test verification ensures system readiness at boot; 2.1 mA supply current allows always-on monitoring without battery drain penalty. |
| Appliance Control | Mechanical Bearing Monitoring |
Use Scenario: Measuring drum imbalance in washing machines during spin cycle to dynamically adjust rotation speed and reduce vibration. IC Role / Device Role / Timing Role: Analog output sensor feeding microcontroller ADC for real-time closed-loop control of motor torque. Use Value: 750 mV/g sensitivity provides >1.8 V swing over ±2.5g range - sufficient resolution for 10-bit ADCs without gain stages. | Use Scenario: Permanent mounting on gearbox housings in wind turbines to monitor early-stage bearing defects via spectral analysis. IC Role / Device Role / Timing Role: High-reliability analog front-end capturing low-frequency vibration signatures (<50 Hz) for FFT-based fault diagnosis. Use Value: Wafer-level hermetic seal prevents oil vapor degradation; −40°C to +105°C rating supports operation in unheated nacelles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-g analog-output accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL326BCPZ | Wider bandwidth (1.5 kHz), higher noise density (150 μg/√Hz), 3-axis output, 1.8–3.6 V supply. | Requires level-shifting for 5 V systems; better suited for high-frequency shock detection than low-speed vibration. | Select ADXL326BCPZ only if multi-axis data or wider bandwidth is required; MMA1270KEGR2 remains optimal for cost-sensitive, single-axis, automotive-grade z-axis monitoring. |
| MMA8452QT | Digital I²C output, embedded FIFO, configurable interrupts, 2–3.6 V supply, lower power (50 μA in standby). | Requires microcontroller with I²C; unsuitable for direct ADC interfacing or analog-only systems. | Choose MMA8452QT for smart sensor nodes with processing capability; MMA1270KEGR2 is preferred for legacy analog designs or where deterministic latency matters. |
Compared with ADXL326BCPZ and MMA8452QT, the MMA1270KEGR2 offers unique value in applications demanding AEC-Q100 Grade 2 qualification, factory-calibrated analog output with no external components, and robust self-test with fault-latched STATUS - making it ideal for safety-aware industrial and automotive subsystems where analog simplicity and proven reliability are prioritized.
Availability
MMA1270KEGR2 is available at Aetrix Electronics and suitable for vibration monitoring and recording, computer hard drive protection, and appliance control requiring stable component supply across automotive and industrial production cycles.
Supply support for MMA1270KEGR2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in sensor technology from its acquisition of Freescale.
The MMA series was designed specifically for robust, low-g motion sensing in harsh environments - emphasizing factory-trimmed accuracy, integrated diagnostics, and AEC-Q100 compliance for automotive safety and industrial predictive maintenance systems.
FAQ
What is the function of the STATUS pin on the MMA1270KEGR2?
The STATUS pin on the MMA1270KEGR2 is an open-drain output that indicates fault conditions or self-test activity. It asserts high when EPROM parity becomes odd (indicating memory corruption) or when the ST pin is high. The latch can be reset by a rising edge on ST only if no persistent fault remains. This behavior is documented in Table 2 and the SPECIAL FEATURES section of the MMA1270KEGR2 datasheet.
Does the MMA1270KEGR2 require external passive components for filtering?
No, the MMA1270KEGR2 does not require external passive components for its primary filtering function. It integrates a 2-pole switched-capacitor Bessel filter clocked internally at ≈70 kHz, with factory-set cutoff frequency. However, a 1 kΩ resistor and 0.1 μF capacitor RC filter is recommended on VOUT to suppress residual clock feedthrough noise - this is a post-filtering cleanup, not part of the core signal conditioning path of the MMA1270KEGR2.
What is the maximum acceleration survivability of the MMA1270KEGR2 when powered versus unpowered?
The MMA1270KEGR2 has a powered acceleration survivability rating of 1500 g and an unpowered rating of 2000 g across all axes, as specified in Table 1 of the official datasheet. These ratings reflect mechanical robustness of the wafer-level sealed g-cell structure and define absolute limits beyond which permanent damage may occur - independent of electrical operation state.
How is self-test initiated and verified on the MMA1270KEGR2?
Self-test on the MMA1270KEGR2 is initiated by applying a logic-high signal to the ST pin. This activates an internal electrostatic force that deflects the movable g-cell plate, producing a measurable output shift (ΔVST = 0.9–1.25 V) at VOUT. Verification is completed by observing both the expected VOUT change and simultaneous STATUS pin assertion - confirming integrity of the mechanical transducer and signal chain in the MMA1270KEGR2.
Is the MMA1270KEGR2 RoHS-compliant and lead-free?
Yes, the MMA1270KEGR2 is RoHS-compliant and Pb-free, as confirmed by the "KEG" suffix in the part number and explicitly stated in the Rev. 0 (11/2009) datasheet. Its functionality and electrical characteristics match those of non-Pb-free versions, and it meets JEDEC J-STD-609A marking requirements for lead-free components - a key requirement for modern industrial and automotive manufacturing.
MMA1270KEGR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- Z
- Acceleration Range:
- ±2.5g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 750
- Bandwidth:
- 50Hz
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MMA1270KEGR2 FAQ
1.How can I place an order for MMA1270KEGR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1270KEGR2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMA1270KEGR2 reliable?
The price and inventory of MMA1270KEGR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1270KEGR2 is usually 5 days.
3.What payment methods are accepted for MMA1270KEGR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1270KEGR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1270KEGR2?
MMA1270KEGR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1270KEGR2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMA1270KEGR2?
For technical support, including MMA1270KEGR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1270KEGR2 requirements.
6.How does Aetrix verify that MMA1270KEGR2 is sourced from the original manufacturer or authorized distributors?
All MMA1270KEGR2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMA1270KEGR2 meets industry standards.
7.What is the process for return or replacement of MMA1270KEGR2?
All MMA1270KEGR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA1270KEGR2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMA1270KEGR2 part is unused and in its original packaging.
Return procedure for MMA1270KEGR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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