IIM-42351 is an industrial-grade 3-axis open-loop MEMS accelerometer from TDK InvenSense.

**One sentence summary:** IIM-42351 is an industrial-grade 3-axis open-loop MEMS accelerometer from TDK InvenSense. It specializes in inclination detection, attitude sensing and low power consumption. With compact form factor and multiple built-in motion event interrupts, it is suitable for automation, AGV and structural monitoring applications.

## Key Specifications

Axes: 3-axis (X/Y/Z)

Measurement range: ±2g / ±4g / ±8g / ±16g, software programmable

Power supply: VDD 1.71~3.6V; IO level 1.71~3.6V, compatible with 1.8V/3.3V MCUs

Communication interface: I3C / I2C / SPI, three optional interfaces

ADC resolution: 16-bit

Noise density: 70 μg/√Hz (typical)

Current consumption: 0.3mA typical with all three axes enabled; lower current in low-power mode

Output data rate: up to 8kHz

Bandwidth: 6.25Hz ~ 4kHz

Shock resistance: 20000g, excellent shock resistance

Operating temperature: -40℃ ~ +105℃ (industrial grade, non-AEC-Q100 automotive qualified)

Package: 14-pin LGA, dimension 2.5 × 3.0 × 0.91mm, wafer-level hermetic package

FIFO: 2KB data buffer

Built-in: On-chip temperature sensor

Sensitivity error: ±0.5%

Compliance: RoHS, REACH

## Features

It performs 3-axis acceleration acquisition. The MCU reads gravity components to calculate inclination angles (open-loop architecture; customers need to implement inclination algorithm via software).

6 built-in hardware motion detection interrupts: motion wake-up, stationary detection, tilt detection, free fall, tap detection, significant motion detection. Hardware-triggered interrupts reduce MCU workload.

The 2KB FIFO buffer supports bulk reading of sensor data, allowing the host controller to enter sleep mode and reduce system power consumption.

Supports external clock input to improve sampling accuracy and reduce part-to-part consistency error.

Wafer-level hermetic package, moisture and dust resistant, suitable for SMT assembly in industrial environments and detectable by TRI AOI.

Applications

Industrial automation: Attitude and inclination monitoring for AGVs, mobile robots and robotic arms

Structural monitoring: Tilt alarm for towers, billboards and small equipment

Security & IoT: Asset attitude monitoring, equipment tip-over alarm and vibration monitoring

Pan-tilt heads, camera stabilization platforms and attitude acquisition for portable industrial instruments

Distinction within the same series: IIM-42351 focuses on inclination / attitude measurement; IIM-42352 targets high-frequency vibration monitoring for predictive maintenance.

Quick Comparison

IIM-42351: 3-axis open-loop, compact size, low power, built-in motion interrupts. Suitable for general industrial inclination and attitude monitoring with high cost performance. It has higher noise than AXO301 and is not suitable for ultra-high-precision micro inclination measurement.

AXO301: Single-axis closed-loop MEMS with ultra-low noise for ultra-high-precision inclination measurement in high-accuracy structural monitoring.

SCL3300-D01: Murata 3-axis inclinometer, outputs angle directly inside the chip. Customers do not need to develop inclination algorithm.