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NXP Semiconductors MMA1250KEG
- Part No.:
- MMA1250KEG
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA1250KEG.pdf
- Description:
- ACCELEROMETER 5G ANALOG 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
MMA1250KEG from Freescale Semiconductor is a z-axis micromachined capacitive accelerometer with ±5g measurement range, factory-calibrated 400 Hz Bessel filter, and integrated self-test functionality. It delivers ratiometric analog voltage output (2.5 V at 0g) and operates over –40°C to +105°C in automotive-grade SOIC-16 packaging, used in hard drive protection and appliance control systems.
For engineers reviewing the MMA1250KEG datasheet, MMA1250KEG pinout, MMA1250KEG application, or MMA1250KEG equivalent, this page provides verified specifications, functional block context, validated pin roles, real-world use cases, and confirmed alternative parts for vibration monitoring, mechanical bearing diagnostics, and motion-sensitive input devices.
Technical Context
The MMA1250KEG integrates a surface-micromachined polysilicon g-cell with a CMOS ASIC using switched-capacitor signal conditioning and a 2-pole Bessel low-pass filter. Its transducer is hermetically sealed at wafer level, enabling high shock survivability (2000 g unpowered) and AEC-Q100 Grade 2 qualification.
Self-test is implemented via an electrostatic force applied to the movable plate using a dedicated ST pin, producing a calibrated ΔVST = 1.0–2.0 V output shift. Fault detection includes EPROM parity error latching and low-voltage/clock failure monitoring reported on the STATUS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | ±5 g - Full-scale linear measurement range centered at 0g output (2.5 V), supporting static and dynamic acceleration sensing including gravity and vibration. |
| Bandwidth (–3 dB) | 400 Hz typical - Preserves pulse shape integrity via Bessel filter; enables accurate capture of mechanical vibration up to ~400 Hz without phase distortion. |
| Output Sensitivity | 400 mV/g typical - Delivers 400 mV change per g of acceleration; allows direct interface to 12-bit ADCs with ~12.5 mg LSB resolution at 5 V supply. |
| Supply Voltage | 4.75–5.25 V - Fully calibrated operation only within this range; outside it, device may function but calibration is not guaranteed. |
| Operating Temperature | –40°C to +105°C - Qualified to AEC-Q100 Rev. F Grade 2, suitable for under-hood automotive and industrial embedded environments. |
| Self-Test Output Shift | 1.0–2.0 V - Verifies mechanical deflection and signal chain integrity; triggered by logic-high ST input, with STATUS pin confirming activation. |
| Zero-g Offset | 2.5 V typical at 25°C - Midsupply output at 0g; shifts linearly ±2.0 V across full range, enabling bidirectional acceleration detection. |
Pinout & Package
Package: 16-lead SOIC (Case 475-01), Pb-free (KEG suffix), RoHS-compliant. Pin 1 marked with dot; pins 9–13 are factory trim connections; pins 14–16 are no-connect (N/C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 7 | VSS | Redundant ground terminals - improve noise immunity and thermal dissipation; all must be connected to system ground plane. |
| 4 | VOUT | Analog output - ratiometric voltage proportional to acceleration; requires RC filter (1 kΩ + 0.1 μF) to suppress switched-capacitor clock noise. |
| 5 | STATUS | Fault latch output - goes high on EPROM parity error, low-voltage detection, or clock fault; reset by ≥100 μs ST pulse unless fault persists. |
| 6 | VDD | Power supply input - must be decoupled with 0.1 μF capacitor close to pin; supports 4.75–5.25 V for full calibration. |
| 8 | ST | Digital self-test enable - logic-high input initiates electrostatic self-test; internal pull-down prevents false triggering from board leakage. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic wafer-level seal | Eliminates package-level moisture ingress and particle contamination, ensuring long-term stability in harsh environments like engine bays. |
| Factory-trimmed 2-pole Bessel filter | Provides linear-phase response at 400 Hz without external components-critical for preserving waveform fidelity in vibration analysis. |
| Calibrated self-test with status feedback | Validates both mechanical g-cell movement and electronic signal path in-system; STATUS pin confirms test execution and detects faults. |
| AEC-Q100 Grade 2 qualification | Guarantees operation from –40°C to +105°C with defined reliability metrics-enables drop-in use in automotive safety-critical subsystems. |
| Ratiometric analog output | Output scales with VDD; eliminates need for precision reference voltage and simplifies ADC interfacing in varying supply conditions. |
Applications
| Hard Drive Protection | Appliance Control |
|---|---|
Use Scenario: Detects free-fall or impact events in laptop computers to park read/write heads before physical contact occurs. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time gravity and shock detection; outputs analog voltage sampled by host microcontroller. Use Value: Prevents data loss and mechanical damage by enabling sub-25 ms head retraction upon 2g+ transient detection. | Use Scenario: Monitors drum rotation imbalance and vibration in washing machines to adjust spin speed or halt operation. IC Role / Device Role / Timing Role: Low-noise z-axis sensor feeding into motor control MCU; measures RMS acceleration in 0.1–1 kHz band. Use Value: Reduces mechanical wear and acoustic noise by dynamically limiting spin RPM when vibration exceeds 0.5 g RMS threshold. |
| Mechanical Bearing Monitoring | Computer Mouse Input |
Use Scenario: Mounted on industrial pump housings to detect early-stage bearing wear via spectral analysis of vibration harmonics. IC Role / Device Role / Timing Role: High-reliability analog sensor capturing broadband vibration; output conditioned with onboard 400 Hz filter to reject high-frequency noise. Use Value: Enables predictive maintenance by identifying 2nd/3rd harmonic amplitude growth >3 dB over baseline-indicative of raceway defects. | Use Scenario: Senses tilt and motion in optical gaming mice to augment cursor positioning with inertial navigation. IC Role / Device Role / Timing Role: Z-axis motion detector providing analog acceleration data to mouse MCU for gesture recognition and lift-off detection. Use Value: Improves tracking accuracy during rapid vertical lifts by distinguishing intentional lift (≥1.5 g) from unintentional bumps (<0.8 g). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL320ARZ | ±5 g range, 2.5 V output at 0g, but uses 1st-order RC filter (1.6 kHz BW); no self-test or STATUS pin. | Lacks fault reporting and calibrated self-test-unsuitable for safety-critical or field-deployed diagnostic systems requiring runtime verification. | Select ADXL320ARZ only for cost-sensitive consumer applications where continuous health monitoring is unnecessary. |
| MMA8452QT | I²C digital output, ±2/±4/±8 g selectable range, embedded FIFO, and interrupt-driven self-test-but requires microcontroller firmware support. | Replaces analog interface with digital protocol; adds motion detection features but increases software complexity and power management overhead. | Choose MMA8452QT when system already uses I²C peripherals and requires multi-axis sensing, wake-on-motion, or configurable thresholds. |
Compared with ADXL320ARZ and MMA8452QT, the MMA1250KEG offers unique value in analog-output simplicity, factory-calibrated Bessel filtering, and hardware-based self-test with fault latching-making it optimal for deterministic, low-software-overhead applications like HDD protection and industrial vibration logging.
Availability
MMA1250KEG is available at Aetrix Electronics and suitable for hard drive protection, appliance control, and mechanical bearing monitoring requiring stable component supply across automotive and industrial production cycles.
Supply support for MMA1250KEG 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
Freescale Semiconductor was a global semiconductor company specializing in embedded processing, analog, and sensor solutions before its acquisition by NXP in 2015.
The MMA series was designed specifically for robust, calibrated analog acceleration sensing in automotive and industrial environments-emphasizing AEC-Q100 compliance, hermetic reliability, and integrated signal conditioning without external components.
FAQ
What is the exact measurement axis orientation for the MMA1250KEG?
The MMA1250KEG is a single-axis z-axis accelerometer. When mounted in the standard SOIC-16 orientation (pin 1 top-left, notch or dot at top-left corner), the sensitive axis is perpendicular to the PCB surface-detecting acceleration toward or away from the board. Earth's gravity produces +1g output when the device's marked side faces upward.
Does the MMA1250KEG require external passive components for basic operation?
No, the MMA1250KEG does not require external components for core functionality. Its 400 Hz Bessel filter, zero-g offset, and sensitivity are factory-set. However, a 0.1 μF decoupling capacitor on VDD and a 1 kΩ + 0.1 μF RC filter on VOUT are strongly recommended to suppress switching noise and ensure stable analog output per Freescale's layout guidelines.
How does the self-test function verify both mechanical and electrical integrity of the MMA1250KEG?
The MMA1250KEG self-test applies an electrostatic force to the movable g-cell plate via the ST pin, causing calibrated deflection. The resulting output shift (1.0–2.0 V) confirms mechanical movement, while the STATUS pin going high verifies signal chain functionality-including amplifier gain, filter response, and output stage. This dual-path check ensures end-to-end system readiness.
Is the MMA1250KEG pin-compatible with other devices in the MMA1250 family?
Yes, the MMA1250KEG shares identical SOIC-16 pinout and electrical behavior with MMA1250EG, MMA1250EGR2, and MMA1250KEGR2. All variants use Case 475-01 packaging, same pin assignments, and identical operating characteristics-differing only in Pb-free compliance (KEG) and packaging format (tape & reel vs. tube).
What is the significance of the "KEG" suffix in MMA1250KEG?
The "KEG" suffix denotes a Pb-free (RoHS-compliant) version manufactured at a different Freescale facility than the "EG" variants. It retains identical electrical performance, mechanical dimensions, and AEC-Q100 Grade 2 qualification-ensuring drop-in replacement capability in environmentally regulated designs without redesign or requalification.
MMA1250KEG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
MMA1250KEG FAQ
1.How can I place an order for MMA1250KEG through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1250KEG 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 MMA1250KEG reliable?
The price and inventory of MMA1250KEG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1250KEG is usually 5 days.
3.What payment methods are accepted for MMA1250KEG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1250KEG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1250KEG?
MMA1250KEG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1250KEG 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 MMA1250KEG?
For technical support, including MMA1250KEG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1250KEG requirements.
6.How does Aetrix verify that MMA1250KEG is sourced from the original manufacturer or authorized distributors?
All MMA1250KEG 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 MMA1250KEG meets industry standards.
7.What is the process for return or replacement of MMA1250KEG?
All MMA1250KEG units undergo pre-shipment inspection (PSI). If there is an issue with MMA1250KEG, 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 MMA1250KEG part is unused and in its original packaging.
Return procedure for MMA1250KEG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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