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STMicroelectronics AIS1120SXTR
- Part No.:
- AIS1120SXTR
- Manufacturer:
- STMicroelectronics
- Category:
- Accelerometers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AIS1120SXTR.pdf
- Description:
- ACCELEROMETER 120G SPI 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,212
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Product details
Overview
AIS1120SXTR from STMicroelectronics is a single-axis automotive MEMS acceleration sensor with SPI interface, ±120 g full-scale range, 14-bit digital output, and AEC-Q100 qualification for airbag deployment systems operating from -40 °C to +105 °C.
For engineers reviewing the AIS1120SXTR datasheet, AIS1120SXTR pinout, AIS1120SXTR application, or AIS1120SXTR equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade performance parameters, and real-world use-case mapping for safety-critical inertial sensing.
Technical Context
The AIS1120SXTR integrates a surface-micromachined silicon proof mass with differential capacitive transduction, a C/V converter, full-differential charge amplifier, second-order sigma-delta ADC, and digital core featuring decimation filtering, linear interpolation, and on-chip oscillator-based timing control.
Its acquisition chain supports selectable low-pass filter cutoffs (400/800/1600 Hz), slow and fast offset cancellation modes, embedded self-test, and factory-trimmed sensitivity and zero-g offset - all managed via 32-bit SPI commands with CRC protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full Scale Range | ±120 g - enables detection of high-deceleration crash events in frontal/side impact scenarios |
| Output Resolution | 14-bit - provides 16,384 discrete acceleration levels over full scale for precise threshold triggering |
| Supply Voltage | 3.3 V ±5% - compatible with standard automotive domain controllers and low-noise LDOs |
| Operating Temp | -40 °C to +105 °C - meets under-hood and passenger compartment thermal requirements per AEC-Q100 Grade 2 |
| Digital Interface | SPI (32-bit frame, CRC-7) - ensures deterministic, noise-immune communication with microcontroller host at up to 10 MHz clock |
| Filter Bandwidth | Selectable 400/800/1600 Hz - allows trade-off between noise rejection and response latency for airbag algorithm timing |
| Self-Test Capability | Embedded electrostatic actuation - verifies mechanical integrity and signal chain functionality without external stimulus |
Pinout & Package
The AIS1120SXTR is housed in an 8-pin plastic SOIC narrow-body package (SOIC8N), surface-mount compatible with standard reflow profiles and automotive board assembly requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.3 V nominal supply rail; requires local 100 nF ceramic decoupling |
| GND | Ground reference | Analog and digital ground common point; must be low-impedance connection to PCB plane |
| CS | Chip select input | Active-low SPI slave selection; synchronous edge-triggered sampling of SDO data |
| SDI | Serial data input | Host-to-device command stream (32-bit frames including address, write/read flag, data) |
| SDO | Serial data output | Device-to-host acceleration data, status registers, and error flags in MSB-first format |
| SCLK | Serial clock input | Master-generated SPI clock; supports up to 10 MHz for sub-100 µs readout latency |
| INT | Interrupt output | Open-drain alert signal indicating data ready, self-test completion, or fault condition |
| NC | No connect | Internally unused pin; must remain unconnected per datasheet layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualified | Validated for automotive safety applications including airbag control units per ISO 26262 ASIL-B readiness |
| Factory-trimmed zero-g offset | Initial offset ≤ ±50 mg - reduces calibration burden in end-system production test |
| Dual-mode offset cancellation | Fast mode (≤10 ms) for runtime correction; slow mode for long-term drift compensation |
| Embedded self-test (EST) | Electrostatic actuation verifies sensor mobility and analog front-end functionality without mechanical shock |
| Temperature-compensated output | Digital core applies gain/offset correction using on-chip temperature sensor readings |
Applications
| Frontal Crash Detection | Side-Impact Sensing |
|---|---|
Use Scenario: Detects rapid deceleration during head-on collisions to trigger airbag inflation within 15–30 ms. IC Role / Device Role / Timing Role: Primary acceleration measurement node feeding real-time crash discrimination algorithms in airbag ECU. Use Value: ±120 g range and 14-bit resolution enable reliable distinction between crash events and road noise or braking. | Use Scenario: Monitors lateral acceleration during T-bone or oblique impacts to activate side-curtain and seat-mounted airbags. IC Role / Device Role / Timing Role: Single-axis inertial sensor mounted orthogonally to vehicle Y-axis for dedicated side-impact vector capture. Use Value: AEC-Q100 qualification and -40 °C to +105 °C operation ensure reliability in door modules exposed to ambient extremes. |
| Vibration Monitoring (Chassis) | Impact Event Logging |
Use Scenario: Captures low-amplitude chassis vibrations during driving to assess suspension health or road surface conditions. IC Role / Device Role / Timing Role: Secondary diagnostic sensor providing time-stamped acceleration waveforms for predictive maintenance analysis. Use Value: Selectable 400 Hz low-pass filter suppresses high-frequency noise while preserving relevant vibration signatures. | Use Scenario: Records peak acceleration magnitude and timestamp during unexpected impacts (e.g., parking lot bumps, cargo shifts). IC Role / Device Role / Timing Role: Standalone event detector logging g-level exceedances into non-volatile memory via host MCU. Use Value: Embedded self-test confirms sensor readiness before each power cycle, ensuring valid impact data capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-axis automotive acceleration sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL312WBRMZ-RL | 3-axis, 13-bit output, 2.0–3.6 V supply, no AEC-Q100 qualification | Targeted at industrial/portable devices; lacks automotive temperature range and qualification | Use only in non-safety-critical, non-automotive contexts where multi-axis data is needed |
| MPU-6050 | 6-axis (3g + 3°/s), I²C/SPI, no AEC-Q100, 25 °C to 85 °C rating | Consumer-grade IMU for motion tracking; unsuitable for airbag or chassis monitoring | Not recommended for automotive safety systems due to missing qualification and limited temp range |
Compared with ADXL312WBRMZ-RL and MPU-6050, the AIS1120SXTR uniquely delivers AEC-Q100 Grade 2 compliance, ±120 g range, and factory-trimmed performance required for airbag deployment - making it the only viable option among the three for certified automotive safety functions.
Availability
AIS1120SXTR is available at Aetrix Electronics and suitable for airbag control units, chassis vibration monitoring systems, and impact event loggers requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for AIS1120SXTR 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
STMicroelectronics is a global semiconductor leader specializing in automotive, industrial, and power management solutions, with deep expertise in MEMS sensor design and high-volume automotive manufacturing.
The AIS1120SXTR belongs to ST's automotive-grade inertial sensor product line, engineered specifically for safety-critical vehicle systems such as occupant restraint control and structural health monitoring.
FAQ
What is the maximum SPI clock frequency supported by the AIS1120SXTR?
The AIS1120SXTR supports SPI clock frequencies up to 10 MHz, enabling sub-100 µs readout latency for acceleration data. This timing aligns with airbag ECU real-time processing windows and is validated across the full -40 °C to +105 °C operating range per datasheet Table 49.
Does the AIS1120SXTR require external calibration after soldering?
No external calibration is required post-assembly. The device undergoes factory trimming for zero-g offset and sensitivity, and its digital core applies temperature-compensated corrections using an integrated temperature sensor - reducing end-of-line calibration steps in automotive production.
How does the embedded self-test (EST) function verify sensor integrity?
The EST applies electrostatic voltage to internal comb fingers, inducing controlled proof mass displacement. The resulting acceleration output is compared against expected values stored in registers; deviation beyond tolerance triggers the EST_FAIL bit in REG_STATUS, confirming mechanical or electrical fault presence.
Can the AIS1120SXTR operate in dual-axis mode?
No. The AIS1120SXTR is strictly a single-axis (X-axis only) device. Dual-axis functionality is provided exclusively by the pin-compatible AIS2120SXTR variant, which shares the same SOIC8N package but integrates orthogonal X/Y sensing elements and corresponding register maps.
AIS1120SXTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Digital
- Axis:
- X
- Acceleration Range:
- ±120g
- Sensitivity (LSB/g):
- 68
- Sensitivity (mV/g):
- -
- Bandwidth:
- 400Hz
- Output Type:
- SPI
- Voltage - Supply:
- 3.13V ~ 3.47V
- Features:
- Adjustable Bandwidth
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AIS1120SXTR FAQ
1.How can I place an order for AIS1120SXTR through Aetrix?
Please submit a Request for Quotation (RFQ) for AIS1120SXTR 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 AIS1120SXTR reliable?
The price and inventory of AIS1120SXTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AIS1120SXTR is usually 5 days.
3.What payment methods are accepted for AIS1120SXTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AIS1120SXTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AIS1120SXTR?
AIS1120SXTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AIS1120SXTR 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 AIS1120SXTR?
For technical support, including AIS1120SXTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AIS1120SXTR requirements.
6.How does Aetrix verify that AIS1120SXTR is sourced from the original manufacturer or authorized distributors?
All AIS1120SXTR 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 AIS1120SXTR meets industry standards.
7.What is the process for return or replacement of AIS1120SXTR?
All AIS1120SXTR units undergo pre-shipment inspection (PSI). If there is an issue with AIS1120SXTR, 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 AIS1120SXTR part is unused and in its original packaging.
Return procedure for AIS1120SXTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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