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NXP Semiconductors MMA1250KEGR2
- Part No.:
- MMA1250KEGR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA1250KEGR2.pdf
- Description:
- ACCELEROMETER 5G ANALOG 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,692
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Product details
Overview
MMA1250KEGR2 from NXP Semiconductors (formerly Freescale) is a single-axis, ±5g silicon capacitive micromachined accelerometer in SOIC-16 package, featuring integrated signal conditioning, 2nd-order Bessel low-pass filtering at 40–50 Hz, and factory-calibrated self-test. It delivers ratiometric analog output (2.5 V ±0.25 V at 0g, 380–420 mV/g sensitivity) for vibration monitoring and mechanical system protection.
For engineers reviewing the MMA1250KEGR2 datasheet, MMA1250KEGR2 pinout, MMA1250KEGR2 application, or MMA1250KEGR2 equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios, and two confirmed alternative accelerometers with documented functional and packaging differences.
Technical Context
The MMA1250KEGR2 implements a surface-micromachined polysilicon g-cell with back-to-back capacitive sensing, read out via switched-capacitor CMOS ASIC. Its on-chip 2-pole Bessel filter ensures linear phase response (maximally flat group delay), preserving pulse integrity without external components.
Self-test is activated by a logic-high ST input, applying electrostatic force to deflect the movable plate; STATUS pin latches high on EPROM parity error, clock fault, or low-voltage detection and resets only upon valid ST pulse-enabling robust fault monitoring in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | ±5g full-scale - defines measurable dynamic/static acceleration envelope for mechanical shock and tilt sensing |
| Output Sensitivity | 380–420 mV/g at VDD = 5.0 V - enables direct interface to 12-bit ADCs with ≥2.5 LSB/g resolution |
| Bandwidth (–3 dB) | 42.5–57.5 Hz - supports vibration analysis up to ~50 Hz without aliasing in industrial monitoring |
| Supply Voltage | 4.75–5.25 V - requires stable 5 V rail; operation outside range invalidates calibration |
| Supply Current | 1.1–3.0 mA - allows battery-powered operation for >1 year with 10 mA·h coin cell at 10 Hz sampling |
| Operating Temperature | –40°C to +105°C - qualified per AEC-Q100 Grade 2 for under-hood automotive and industrial environments |
| RMS Noise (0.1–1 kHz) | 2.0–4.0 mVrms - corresponds to ~500–1000 μg noise floor for sub-g motion detection |
Pinout & Package
Package: 16-lead SOIC (Case 475-01), RoHS-compliant, Pb-free (KEG suffix), tape-and-reel packaging (R2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 7 | VSS | Redundant ground connections - must be tied to common PCB ground plane to minimize noise coupling |
| 4 | VOUT | Analog voltage output (ratiometric to VDD) - requires 1 kΩ + 0.1 μF RC filter to suppress switched-capacitor clock noise |
| 5 | STATUS | Open-drain fault indicator - latches high on EPROM parity error or clock failure; reset via ST pulse |
| 6 | VDD | Power supply input - requires 0.1 μF decoupling capacitor placed ≤2 mm from pin |
| 8 | ST | Digital self-test enable - internal pull-down prevents false triggering; 100 μs minimum pulse width required |
| 9–13 | Trim pins | Factory-programmed calibration nodes - must remain unconnected in end application |
| 14–16 | N/C | No internal connection - recommended floating per datasheet; no PCB routing needed |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic wafer-level seal | Eliminates moisture-induced drift and long-term parameter shift in humid environments |
| Calibrated self-test | Verifies full signal chain integrity (mechanical g-cell + ASIC) without external test equipment |
| EPROM parity check | Ensures factory-trim data integrity; STATUS pin asserts on odd-parity detection |
| Transverse sensitivity ≤5% FSO | Rejects off-axis acceleration interference in single-axis mounting configurations |
| AEC-Q100 Grade 2 qualification | Validated for automotive under-hood use with guaranteed performance across –40°C to +105°C |
Applications
| Vibration Monitoring and Recording | Computer Hard Drive Protection |
|---|---|
Use Scenario: Continuous measurement of bearing housing vibration in HVAC compressors to detect early-stage wear. IC Role / Device Role / Timing Role: Z-axis accelerometer providing analog voltage proportional to RMS acceleration magnitude. Use Value: Enables predictive maintenance alerts before catastrophic failure; ±5g range captures both low-frequency imbalance and high-frequency bearing defects. | Use Scenario: Sudden drop detection in laptop computers to park HDD heads before impact. IC Role / Device Role / Timing Role: Static and dynamic acceleration sensor triggering head retraction logic within 25 ms of free-fall onset. Use Value: 2.0–4.0 mVrms noise floor ensures reliable 1g threshold detection; STATUS pin confirms self-test pass pre-deployment. |
| Appliance Control | Mechanical Bearing Monitoring |
Use Scenario: Spin-balance correction in front-loading washing machines during high-RPM cycles. IC Role / Device Role / Timing Role: Z-axis motion detector feeding real-time feedback to motor controller for load redistribution. Use Value: 42.5–57.5 Hz bandwidth rejects spin motor harmonics while capturing imbalance-induced oscillation at 10–30 Hz. | Use Scenario: Permanent installation on gearbox housings in wind turbine pitch control systems. IC Role / Device Role / Timing Role: Low-drift acceleration transducer measuring axial vibration spectra for spectral analysis. Use Value: Wafer-level hermetic seal ensures 10+ year reliability in outdoor, high-humidity environments without conformal coating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-axis analog-output accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL326BCPZ-RL7 | Wider ±16g range, higher 550 Hz bandwidth, but no STATUS fault latch or EPROM parity check | Lacks built-in fault diagnostics - requires external microcontroller polling and validation logic | Select when higher dynamic range and bandwidth outweigh need for autonomous fault reporting |
| MMA8452QT | I²C digital output, 12-bit resolution, embedded motion detection engine, but requires external MCU for configuration | Not pin-compatible; needs firmware integration for tap/double-tap, orientation, and FIFO management | Select when system already uses I²C infrastructure and benefits from on-chip event processing |
Compared with MMA1250KEGR2, ADXL326BCPZ-RL7 offers extended range and speed but sacrifices autonomous diagnostics, while MMA8452QT shifts complexity to software with digital intelligence but eliminates analog signal conditioning design effort.
Availability
MMA1250KEGR2 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 temperature ranges.
Supply support for MMA1250KEGR2 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.
The MMA series was designed by Freescale (acquired by NXP in 2015) specifically for high-reliability, single-axis analog acceleration sensing in harsh environments with integrated diagnostics and AEC-Q100 compliance.
FAQ
What is the exact acceleration range and output sensitivity of the MMA1250KEGR2?
The MMA1250KEGR2 has a full-scale acceleration range of ±5g and a nominal sensitivity of 400 mV/g (typical), with a specified range of 380–420 mV/g at VDD = 5.0 V. At 0g, the output is centered at VDD/2 (2.5 V), varying linearly to ~2.9 V at +5g and ~2.1 V at –5g. This ratiometric behavior ensures consistent scaling across supply variations within 4.75–5.25 V.
Does the MMA1250KEGR2 require external passive components for filtering?
No, the MMA1250KEGR2 integrates a 2nd-order switched-capacitor Bessel filter with a factory-set –3 dB bandwidth of 42.5–57.5 Hz. However, an external 1 kΩ resistor and 0.1 μF capacitor on VOUT are recommended to suppress residual clock feedthrough noise from the internal filter circuitry-this RC network does not set cutoff frequency but improves SNR.
How does the self-test function work on the MMA1250KEGR2, and what does the STATUS pin indicate?
The MMA1250KEGR2 initiates self-test when a logic-high pulse ≥100 μs is applied to the ST pin, electrostatically deflecting the g-cell's movable plate. The resulting output shift verifies mechanical and electronic functionality. The STATUS pin outputs high during self-test and latches high on EPROM parity error, clock fault, or undervoltage-reset only by another ST pulse if no active fault remains.
What is the operating temperature range and qualification status of the MMA1250KEGR2?
The MMA1250KEGR2 is rated for –40°C to +105°C and qualified to AEC-Q100 Rev. F Grade 2 standards. This certification validates its reliability for automotive under-hood applications and industrial environments where thermal cycling and long-term stability are critical. The device's wafer-level hermetic seal further enhances lifetime performance in humid conditions.
Can the MMA1250KEGR2 be used in battery-powered devices, and what is its typical supply current?
Yes, the MMA1250KEGR2 draws 1.1–3.0 mA (typical 2.1 mA) from a 4.75–5.25 V supply, making it suitable for battery-powered applications. With ultra-low 2.0–4.0 mVrms noise and ±5g range, it supports multi-year operation on small Li-MnO₂ or CR2032 cells when paired with duty-cycled sampling-e.g., 10 Hz acquisition yields ~18 μA average current with appropriate power gating.
MMA1250KEGR2 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:
- ±5g
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 400
- 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
MMA1250KEGR2 FAQ
1.How can I place an order for MMA1250KEGR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1250KEGR2 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 MMA1250KEGR2 reliable?
The price and inventory of MMA1250KEGR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1250KEGR2 is usually 5 days.
3.What payment methods are accepted for MMA1250KEGR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1250KEGR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1250KEGR2?
MMA1250KEGR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1250KEGR2 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 MMA1250KEGR2?
For technical support, including MMA1250KEGR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1250KEGR2 requirements.
6.How does Aetrix verify that MMA1250KEGR2 is sourced from the original manufacturer or authorized distributors?
All MMA1250KEGR2 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 MMA1250KEGR2 meets industry standards.
7.What is the process for return or replacement of MMA1250KEGR2?
All MMA1250KEGR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA1250KEGR2, 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 MMA1250KEGR2 part is unused and in its original packaging.
Return procedure for MMA1250KEGR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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