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NXP Semiconductors MMA1250EG
- Part No.:
- MMA1250EG
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA1250EG.pdf
- Description:
- ACCELEROMETER 5G ANALOG 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,596
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Product details
Overview
MMA1250EG from Freescale Semiconductor is a silicon capacitive, micromachined z-axis accelerometer with integral signal conditioning, factory-calibrated ±5g full-scale range, 400 Hz Bessel filter bandwidth, and AEC-Q100 Grade 2 qualification (–40°C to +105°C). It delivers ratiometric linear output voltage (2.5 V at 0g) for vibration monitoring and hard drive protection systems.
For engineers reviewing the MMA1250EG datasheet, MMA1250EG pinout, MMA1250EG application, or MMA1250EG equivalent, this page provides verified technical context, SOIC-16 package mapping, self-test and status pin behavior, noise performance (2.0 mVRMS), and calibrated alternatives for automotive-grade motion sensing.
Technical Context
The MMA1250EG integrates a surface-micromachined polysilicon g-cell with a CMOS ASIC using switched-capacitor measurement, temperature compensation, and on-chip 2-pole Bessel filtering. Its output is ratiometric to VDD (4.75–5.25 V), with zero-g offset trimmed via EPROM and validated by factory-set calibration.
Self-test is initiated via logic-high ST pin, generating electrostatic deflection of the movable plate; STATUS pin latches high on EPROM parity error, low-voltage detection, or clock fault, and resets only upon ST pulse if no active fault persists.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | ±5g - Full-scale linear sensing range centered at 0g output (2.5 V) |
| Bandwidth Response | 400 Hz (f−3dB) - Preserves pulse shape integrity via Bessel filter |
| Output Sensitivity | 400 mV/g (typ) - Enables direct analog-to-digital conversion without gain staging |
| Supply Voltage | 4.75–5.25 V - Guaranteed calibration and linearity only within this range |
| Supply Current | 2.1 mA (typ) - Supports low-power embedded operation in always-on systems |
| Output Noise | 2.0 mVRMS (0.1–1.0 kHz) - Limits minimum detectable acceleration to ~5 mg RMS |
| Operating Temp | –40°C to +105°C - Qualified per AEC-Q100 Grade 2 for under-hood automotive use |
Pinout & Package
Package: 16-lead SOIC (Case 475-01), RoHS-compliant, Pb-free (KEG suffix indicates Pb-free variant; MMA1250EG shares same package and pinout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (Pins 1–3, 7) | Power Ground | Redundant ground connections; all must be connected to PCB ground plane for noise immunity |
| VOUT (Pin 4) | Analog Output | Ratiometric voltage output (2.5 V ±0.25 V at 0g); requires RC filter (1 kΩ + 0.1 μF) to suppress clock noise |
| STATUS (Pin 5) | Fault Latch Output | Open-drain logic output; high indicates EPROM parity error, clock fault, or low-VDD condition |
| VDD (Pin 6) | Power Supply | 4.75–5.25 V supply; requires 0.1 μF decoupling capacitor placed adjacent to pin |
| ST (Pin 8) | Self-Test Control | Active-high digital input; initiates mechanical+electrical self-test; also resets STATUS latch |
| Pins 9–13 | Factory Trim | No internal connection; must be left floating per datasheet |
| Pins 14–16 | No Connect | No internal connection; recommended floating; not tied to ground or VDD |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Wafer-Level Seal | Eliminates package-level moisture ingress, enabling >10-year reliability in humid environments |
| Calibrated Self-Test | Verifies full signal chain integrity (mechanical g-cell + ASIC) with known ΔVST = 1.0–2.0 V output shift |
| EPROM Parity Check | Detects memory corruption in trim data; triggers STATUS pin latch to alert system controller |
| Transverse Sensitivity ≤5% FSO | Rejects off-axis acceleration interference, critical for single-axis z-direction mounting accuracy |
| AEC-Q100 Grade 2 Qualification | Validated for automotive applications requiring operation up to +105°C ambient |
Applications
| Vibration Monitoring and Recording | Computer Hard Drive Protection |
|---|---|
Use Scenario: Continuous monitoring of rotating machinery bearing vibration spectra in industrial predictive maintenance systems. IC Role / Device Role / Timing Role: Z-axis accelerometer providing analog voltage output proportional to real-time acceleration magnitude and frequency content. Use Value: 400 Hz Bessel bandwidth preserves transient impact signatures; ±5g range captures both low-frequency imbalance and high-frequency bearing defect frequencies. | Use Scenario: Sudden drop detection in laptop computers to park HDD heads before impact. IC Role / Device Role / Timing Role: Static and dynamic z-axis acceleration sensor triggering immediate mechanical actuation upon free-fall detection. Use Value: Factory-trimmed zero-g offset (2.5 V ±0.25 V) enables reliable 1g threshold detection; self-test validates readiness before each power cycle. |
| Appliance Control | Automotive Airbag Systems |
Use Scenario: Washing machine drum imbalance detection during spin cycle to dynamically adjust rotation speed or halt operation. IC Role / Device Role / Timing Role: Z-axis motion sensor measuring vertical acceleration peaks correlated with load distribution asymmetry. Use Value: Robust shock survivability (2000 g unpowered) ensures longevity despite repeated high-G vibrations; AEC-Q100 qualification supports extended product lifecycle. | Use Scenario: Frontal crash event detection in passenger vehicle airbag control units. IC Role / Device Role / Timing Role: Safety-critical z-axis accelerometer feeding analog signal to airbag ECU for real-time crash severity analysis. Use Value: Calibrated self-test and STATUS fault latch provide ISO 26262 ASIL-B support; EPROM parity check prevents undetected trim corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar z-axis accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMA1250KEG | Pb-free variant (KEG suffix); identical electrical specs, same SOIC-16 package, sourced from different facility | No functional difference; used where RoHS compliance is mandatory and traceability to specific fab required | Select MMA1250KEG when Pb-free certification documentation and lot traceability are contractually required. |
| ADXL322ARZ | Wider bandwidth (550 Hz), higher noise (4.5 mVRMS), no STATUS fault latch or EPROM parity check | Lacks integrated fault diagnostics; unsuitable for ASIL-B or safety-monitored systems | Select ADXL322ARZ only for cost-sensitive non-safety applications needing higher bandwidth but accepting reduced diagnostic capability. |
Compared with MMA1250EG, MMA1250KEG offers identical performance with formal Pb-free compliance, while ADXL322ARZ trades built-in diagnostics and automotive qualification for higher bandwidth and broader commercial availability-making MMA1250EG the optimal choice for safety-aware, temperature-rigorous deployments.
Availability
MMA1250EG is available at Aetrix Electronics and suitable for vibration monitoring, computer hard drive protection, and appliance control applications requiring stable component supply across automotive and industrial production cycles.
Supply support for MMA1250EG 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 (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, sensors, and automotive ICs.
The MMA series was designed specifically for high-reliability motion sensing in automotive and industrial environments, emphasizing factory-calibrated accuracy, hermetic reliability, and integrated diagnostics.
FAQ
What is the full-scale acceleration range and output sensitivity of the MMA1250EG?
The MMA1250EG has a full-scale acceleration range of ±5g and a typical output sensitivity of 400 mV/g. At 0g, its output voltage is 2.5 V (ratiometric to VDD), increasing linearly with positive acceleration and decreasing with negative acceleration. This sensitivity is factory-calibrated and does not require external components to maintain accuracy.
Does the MMA1250EG require external passive components for filtering or biasing?
No, the MMA1250EG integrates a 2-pole switched-capacitor Bessel filter with a fixed 400 Hz cutoff; no external resistors or capacitors are needed to set bandwidth. However, a 1 kΩ resistor and 0.1 μF capacitor are recommended on VOUT to suppress clock noise, and a 0.1 μF decoupling capacitor is required on VDD per datasheet layout guidelines.
How does the self-test function work on the MMA1250EG, and what output change should be expected?
The MMA1250EG self-test is activated by applying a logic-high signal to the ST pin, which applies electrostatic force to deflect the g-cell's movable plate. This produces a calibrated output voltage shift (ΔVST) of 1.0–2.0 V at VOUT, verifying both mechanical and electronic functionality. The STATUS pin also goes high during self-test to confirm connectivity.
What fault conditions cause the STATUS pin on the MMA1250EG to latch high?
The STATUS pin on the MMA1250EG latches high in response to EPROM parity errors, low-voltage detection (VDD below specification), or internal clock frequency failure. It remains high until reset by a ≥100 μs pulse on the ST pin-unless the underlying fault persists, in which case it reasserts immediately after reset.
Is the MMA1250EG pin-compatible with other devices in the MMA1250 family, such as the MMA1250KEG?
Yes, the MMA1250EG is pin-compatible and functionally identical to the MMA1250KEG, differing only in RoHS compliance (KEG = Pb-free) and manufacturing site. Both share the same SOIC-16 package (Case 475-01), identical pinout, electrical specifications, and timing behavior-making them direct drop-in replacements in existing designs.
MMA1250EG 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
MMA1250EG FAQ
1.How can I place an order for MMA1250EG through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1250EG 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 MMA1250EG reliable?
The price and inventory of MMA1250EG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1250EG is usually 5 days.
3.What payment methods are accepted for MMA1250EG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1250EG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1250EG?
MMA1250EG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1250EG 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 MMA1250EG?
For technical support, including MMA1250EG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1250EG requirements.
6.How does Aetrix verify that MMA1250EG is sourced from the original manufacturer or authorized distributors?
All MMA1250EG 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 MMA1250EG meets industry standards.
7.What is the process for return or replacement of MMA1250EG?
All MMA1250EG units undergo pre-shipment inspection (PSI). If there is an issue with MMA1250EG, 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 MMA1250EG part is unused and in its original packaging.
Return procedure for MMA1250EG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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