NXP Semiconductors MMA1250EGR2

Overview

MMA1250EGR2 from NXP Semiconductors (formerly Freescale) is a single-axis, ±5g silicon capacitive micromachined accelerometer with integrated signal conditioning, 2nd-order Bessel low-pass filter, and factory-calibrated self-test. It delivers ratiometric analog output (VOUT), 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 MMA1250EGR2 datasheet, MMA1250EGR2 pinout, MMA1250EGR2 application, or MMA1250EGR2 equivalent, this page provides verified functional block architecture, SOIC-16 terminal mapping, calibrated self-test behavior, status fault-latch operation, and real-world use cases in hard drive protection and appliance control.

Technical Context

The MMA1250EGR2 implements a surface-micromachined polysilicon g-cell transducer hermetically sealed at wafer level, paired with a CMOS ASIC using switched-capacitor techniques for capacitance-to-voltage conversion. Its 2-pole Bessel filter (f_−3dB = 400 Hz typ.) ensures linear phase response and pulse shape integrity without external components.

Self-test is activated via logic-high ST input, applying electrostatic force to deflect the movable plate; resulting output shift (ΔV_ST = 1.0–2.0 V) verifies mechanical and electrical integrity. The STATUS pin latches high on EPROM parity error, clock failure, or low-voltage detection and resets only upon ST pulse if no active fault persists.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case No. 475-01), RoHS-compliant, tape-and-reel packaging (EGR2 suffix). Pin 1 marked by notch or dot; pins 9–13 are factory trim terminals; pins 14–16 are NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-axis analog-output accelerometer applications.

Compared with ADXL326BCPZ and MMA8452QT, the MMA1250EGR2 uniquely combines analog output, factory-calibrated self-test, and hardware-latched STATUS reporting in a single SOIC-16 package-enabling plug-and-play vibration sensing without firmware overhead or external fault monitoring circuitry.

Availability

MMA1250EGR2 is available at Aetrix Electronics and suitable for computer hard drive protection, appliance control, vibration monitoring and recording, and computer mouse and joystick applications requiring stable component supply across automotive and industrial production cycles.

Supply support for MMA1250EGR2 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 robust, calibrated analog acceleration sensing in harsh environments - emphasizing wafer-level hermeticity, AEC-Q100 qualification, and integrated diagnostics.

FAQ

What is the supply voltage range for the MMA1250EGR2?

The MMA1250EGR2 operates within 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 2.1 mA typical current at 5.0 V, making it compatible with standard 5 V microcontroller power domains. Decoupling with a 0.1 μF ceramic capacitor placed near the VDD pin is mandatory for stable operation.

Does the MMA1250EGR2 support self-test, and how is it triggered?

Yes, the MMA1250EGR2 features a calibrated hardware self-test activated by applying a logic-high signal to the ST pin (Pin 8). This applies electrostatic force to the g-cell, producing a measurable output shift of 1.0–2.0 V at VOUT. The STATUS pin reflects self-test activity and faults. The MMA1250EGR2's self-test requires no firmware or external components - it is fully autonomous and factory-verified.

What does the STATUS pin indicate, and how is it reset?

The STATUS pin on the MMA1250EGR2 is an open-drain output that latches high upon occurrence of EPROM parity error, clock frequency failure, or low-voltage detection. It remains high until a rising edge is applied to the ST pin for ≥100 μs - provided no active fault condition persists. This behavior allows deterministic fault recovery in safety-aware systems without requiring continuous polling or external logic.

Is the MMA1250EGR2 pin-compatible with the MMA1250EG or MMA1250KEGR2?

Yes, the MMA1250EGR2 shares identical SOIC-16 pinout, electrical characteristics, and functional behavior with MMA1250EG and MMA1250KEGR2. All three variants use Case No. 475-01 and differ only in manufacturing source and RoHS compliance (KEG suffix denotes Pb-free). No PCB layout changes are required when substituting between these part numbers.

What is the bandwidth and filter type used in the MMA1250EGR2?

The MMA1250EGR2 incorporates an onboard 2-pole switched-capacitor Bessel filter with a typical −3 dB cutoff frequency of 400 Hz. The Bessel implementation ensures maximally flat group delay and preserves transient waveform shape - critical for accurate vibration signature analysis and impact timing. No external resistors or capacitors are needed to set or adjust this filter.