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NXP Semiconductors MMA1250D
- Part No.:
- MMA1250D
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA1250D.pdf
- Description:
- ACCELEROMETER 5G ANALOG 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
MMA1250D from Freescale Semiconductor (formerly Motorola) is a silicon capacitive, micromachined Z-axis accelerometer with integrated signal conditioning, factory-calibrated ±5g full-scale range, 42.5–57.5 Hz Bessel filter bandwidth, and self-test capability. It delivers linear ratiometric analog output voltage referenced to VDD and operates across –40°C to +105°C for industrial vibration monitoring and hard drive protection.
For engineers reviewing the MMA1250D datasheet, MMA1250D pinout, MMA1250D application, or MMA1250D equivalent, key selection criteria include its SOIC-16 package, 2.1 mA typical supply current, 380–420 mV/g sensitivity, 2.0–4.0 mVrms noise (0.1–1.0 kHz), and status/fault-latch functionality tied to EPROM parity verification.
Technical Context
The MMA1250D implements a surface-micromachined capacitive sensing cell paired with a CMOS ASIC using switched-capacitor techniques for capacitance-to-voltage conversion, filtering, and temperature compensation. Its 2-pole Bessel filter preserves pulse shape integrity via linear phase response and requires no external components.
Self-test is executed by applying a logic-high signal to the ST pin, electrostatically deflecting the movable plate to verify mechanical and electrical integrity. The STATUS pin latches high on EPROM parity error or during self-test, and resets only upon rising edge of ST-unless fault persists.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | ±5 g - Full-scale measurement range centered at zero-g output (VDD/2), enabling detection of both positive and negative acceleration along Z-axis. |
| Sensitivity | 380–420 mV/g - Output voltage change per g of acceleration; enables direct analog interface to 10-bit+ ADCs without gain staging. |
| Bandwidth (–3 dB) | 42.5–57.5 Hz - Bessel-filtered response optimized for low-phase-distortion vibration monitoring below audio frequencies. |
| Supply Current | 1.1–3.0 mA - Low power consumption suitable for always-on industrial sensors and portable device protection circuits. |
| Noise (RMS) | 2.0–4.0 mVrms (0.1–1.0 kHz) - Enables resolution of sub-5 mg acceleration changes in static and low-frequency dynamic applications. |
| Operating Temperature | –40°C to +105°C - Qualified for under-hood automotive, industrial control, and harsh-environment embedded systems. |
| Output Type | Ratiometric analog voltage - Output scales linearly with VDD, eliminating need for precision voltage reference in supply-tolerant designs. |
Pinout & Package
Package: 16-lead SOIC (Case 475–01), 7.5 mm × 10.3 mm body, 1.27 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 7 | VSS | Redundant ground connections; improve noise immunity and thermal dissipation when all bonded to PCB ground plane. |
| 4 | VOUT | Analog output voltage proportional to Z-axis acceleration; requires RC filter (1 kΩ + 0.1 µF) to suppress switched-capacitor clock noise. |
| 5 | STATUS | Open-drain fault indicator; asserts high on EPROM parity error or during self-test; requires external pull-up for logic-level interfacing. |
| 6 | VDD | Power supply input (4.75–5.25 V); must be decoupled with 0.1 µF capacitor placed near pin to stabilize internal regulators. |
| 8 | ST | Active-high self-test trigger; internal pull-down prevents false activation; rising edge initiates mechanical-electrical verification sequence. |
| 9–13 | Trim | Factory-laser-trimmed calibration nodes; no user connection required and must remain unconnected in circuit. |
| 14–16 | No Connect | Internally unconnected; must be left floating per datasheet to avoid parasitic coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic wafer-level seal | Prevents moisture and particle ingress into MEMS cavity, ensuring long-term bias stability and reliability in humid or dusty environments. |
| Calibrated self-test | Verifies end-to-end functionality-including transducer deflection, ASIC signal chain, and output stage-without external test equipment or disassembly. |
| EPROM parity check | Detects corruption of factory-programmed calibration coefficients; triggers STATUS pin latch to enable system-level fault reporting and diagnostics. |
| 2nd-order Bessel filter | Provides maximally flat group delay for accurate time-domain waveform capture in vibration analysis, avoiding phase-induced distortion. |
| Z-axis single-axis architecture | Optimized for vertical motion detection (e.g., drop sensing, tilt, gravity reference); eliminates cross-axis interference in dedicated orientation applications. |
Applications
| Hard Drive Drop Protection | Industrial Vibration Monitoring |
|---|---|
Use Scenario: Detects sudden free-fall events in laptop computers to park read/write heads before impact. IC Role / Device Role / Timing Role: Z-axis accelerometer providing real-time gravity vector threshold detection with <25 ms self-test response time. Use Value: Prevents mechanical damage and data loss by enabling head retraction within 10–15 ms of 1.2 m drop initiation, leveraging ±5g range and ratiometric output stability. | Use Scenario: Mounted on motor housings or gearboxes to capture low-frequency vibration spectra for predictive maintenance. IC Role / Device Role / Timing Role: Analog sensor front-end delivering filtered 42.5–57.5 Hz output to microcontroller ADC for FFT-based spectral analysis. Use Value: Enables detection of bearing wear harmonics below 60 Hz with 2.0 mVrms noise floor, supporting early fault identification without external amplification. |
| Appliance Motion Control | Computer Input Devices |
Use Scenario: Embedded in washing machines to detect drum imbalance during spin cycle and adjust rotation speed or halt operation. IC Role / Device Role / Timing Role: Z-axis acceleration monitor triggering closed-loop control decisions based on peak g-level thresholds and duration. Use Value: Reduces mechanical stress and acoustic noise by limiting spin RPM to ≤1200 rpm when >3g imbalance is detected, using factory-calibrated sensitivity and temperature compensation. | Use Scenario: Integrated into gaming mice or VR controllers to translate hand motion into cursor displacement or orientation tracking. IC Role / Device Role / Timing Role: Low-latency analog motion sensor feeding sampled data to host MCU for real-time gesture interpretation. Use Value: Delivers consistent 380–420 mV/g sensitivity across –40°C to +105°C, enabling reliable motion mapping without runtime recalibration in consumer-grade enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-axis analog accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL322 | Wider bandwidth (500 Hz), higher noise (150 µg/√Hz), ±2g range, different pinout (16-pin LCC vs SOIC). | Better suited for high-frequency shock detection; less optimal for low-noise, low-bandwidth vibration analysis. | Select ADXL322 only when >100 Hz response or dual-axis capability is required; not pin-compatible with MMA1250D. |
| MMA8451Q | Digital I²C output, embedded FIFO, configurable ODR (1.5–800 Hz), ±2/4/8g ranges, 3×3 mm DFN package. | Requires firmware integration for digital interface; lacks analog simplicity and self-test voltage output verification. | Choose MMA8451Q for space-constrained, low-power IoT nodes needing programmable features; not a drop-in replacement. |
Compared with ADXL322 and MMA8451Q, the MMA1250D offers unique value in analog-output simplicity, factory-calibrated ±5g range, and hardware-verified self-test-making it optimal for cost-sensitive, fixed-function industrial and storage protection systems where minimal signal chain complexity is critical.
Availability
MMA1250D is available at Aetrix Electronics and suitable for hard drive protection, industrial vibration monitoring, appliance motion control, and computer input devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMA1250D 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) was a leading designer of embedded processors, analog, and sensor ICs, emphasizing automotive, industrial, and consumer reliability.
The MMA series was developed specifically for robust, calibrated single-axis acceleration sensing in safety-critical and high-reliability applications such as disk drive protection and industrial condition monitoring.
FAQ
What is the operating voltage range for the MMA1250D?
The MMA1250D operates over a supply voltage range of 4.75 V to 5.25 V. Operation outside this range may yield linear output but is not guaranteed to maintain factory calibration. The device draws 1.1–3.0 mA typical supply current and requires a 0.1 µF ceramic capacitor directly at the VDD pin for stable internal regulation. Exceeding 7.0 V or dropping below –0.3 V risks permanent damage.
How does the self-test function work on the MMA1250D?
The MMA1250D self-test applies an electrostatic force to the MEMS proof mass via a dedicated fourth plate when a logic-high signal is applied to the ST pin. This causes measurable deflection, producing a calibrated output voltage shift on VOUT. The STATUS pin also goes high during test. Response time is ≤25 ms, and the feature verifies both mechanical integrity and signal chain functionality without external equipment.
What does the STATUS pin indicate on the MMA1250D?
The STATUS pin on the MMA1250D is an open-drain output that asserts high during self-test or when EPROM parity becomes odd-indicating potential corruption of factory calibration data. It remains latched high until reset by a rising edge on the ST pin, unless the fault persists. External pull-up is required for proper logic-level interfacing with microcontrollers or monitoring circuitry.
Can the MMA1250D measure static acceleration like gravity?
Yes, the MMA1250D measures static acceleration including Earth's gravity. With zero acceleration, VOUT sits at VDD/2 (e.g., ~2.5 V at 5.0 V supply). Positive Z-axis acceleration increases output above VDD/2; negative acceleration decreases it. Its ±5g range and temperature-compensated design support reliable tilt and orientation sensing across –40°C to +105°C.
Is the MMA1250D pin-compatible with other SOIC-16 accelerometers?
No, the MMA1250D has a proprietary pin assignment optimized for its signal chain and self-test architecture. Pins 9–13 are factory trim nodes, and pins 14–16 are no-connect-differing from generic SOIC-16 sensor layouts. Substitution with other SOIC-16 accelerometers (e.g., ADXL322) requires PCB redesign due to incompatible pin functions and electrical interfaces.
MMA1250D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MMA1250D FAQ
1.How can I place an order for MMA1250D through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA1250D 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 MMA1250D reliable?
The price and inventory of MMA1250D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA1250D is usually 5 days.
3.What payment methods are accepted for MMA1250D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA1250D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA1250D?
MMA1250D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA1250D 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 MMA1250D?
For technical support, including MMA1250D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA1250D requirements.
6.How does Aetrix verify that MMA1250D is sourced from the original manufacturer or authorized distributors?
All MMA1250D 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 MMA1250D meets industry standards.
7.What is the process for return or replacement of MMA1250D?
All MMA1250D units undergo pre-shipment inspection (PSI). If there is an issue with MMA1250D, 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 MMA1250D part is unused and in its original packaging.
Return procedure for MMA1250D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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