ADVANCED ACCELEROMETER SOLUTIONS
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SDI 1531 SURFACE MOUNT ACCELEROMETERS

The SDI 1531 delivers stable, low-noise output in applications up to +175°C, making it ideal for the harshest sensing environments.

MODEL 1531 HIGH-TEMPERATURE TO +175°C

Meet the SDI 1531: Engineered for Performance in Extreme Heat

The SDI Model 1531 is a high-temperature industrial surface mount accelerometer designed for consistent operation in thermally intense environments. With performance characteristics nearly identical to the SDI 1521, the 1531 extends the temperature range up to +175°C through the use of high-temp materials and rigorous thermal conditioning. Each unit is nitrogen-damped, hermetically sealed, and individually tested in a climate chamber to ensure lasting stability under elevated temperatures. It’s ideal for applications like measurement while drilling (MWD), downhole monitoring, industrial process control, and energy systems where performance cannot degrade with heat.

Key Features And Use Cases

Key Performance Features
  • Low Noise: 12 μg/√Hz Typical for ±5g Full Scale Versions
  • -55 to +175°C Operation
  • Responds to frequencies from zero (DC) to 4000+ Hz
  • High Stability and Durability
  • ±4V Differential Output
  • +5 VDC, 5 mA Power
  • Integrated Sensor & Amplifier
  • Internal Temperature Sensor
  • Nitrogen Damped & Hermetically Sealed
  • Serialized for Traceability
  • RoHS Compliant
Applications
  • MWD
  • Instrumentation
  • OEM
  • Vibration

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Designed for High-Temperature Reliability, Low Noise, and Long-Term Stability

The Model 1531 is purpose-built for high-temperature environments, delivering dependable performance, clean signal output, and proven durability in applications up to +175°C.

Temperature Stability in Extreme Operating Conditions

Designed for continuous use from -55°C to +175°C, the 1531 is built to persist where other MEMS sensors fail. It undergoes extensive thermal conditioning and validation to maintain accuracy and repeatability in extended high-temp environments.

Low Noise Performance for Clean, Reliable Signals

With a typical noise floor of 12 μg/rootHz in the ±5g range, the SDI 1531 maintains signal clarity even under thermal stress. It’s an excellent fit for high-vibration, high-interference systems where noise suppression is critical for accurate measurement.

Long-Term Signal Stability You Can Trust

The 1531’s robust design, differential ±4V output, and low power draw make it a dependable solution for long-duration deployments in harsh conditions. Each unit is serialized for traceability and calibrated to deliver consistent performance over time.

Compare Specifications

Explore available g-ranges, frequency responses, sensitivity, and shock ratings in the SDI 1531 specifications chart to find the configuration that best fits your application
g Range Sensitivity,
Differential		 Frequency
Response
(Typ, 3 dB)		 Frequency
Response
(Min, 3 dB)		 Frequency
Response
(Typ, 5%)		 Output Noise,
Differential
(RMS, Typ)		 Max. Mechanical
Shock (0.1 ms)
g mV/g Hz Hz Hz μg/(root Hz) g (peak)
±5 800 0 – 800 0 – 420 0 – 400 12 2000
±10 400 0 – 1100 0 – 660 0 – 700 18 5000
±25 160 0 – 1750 0 – 1050 0 – 1300 25 5000
±50 80 0 – 2100 0 – 1400 0 – 1600 50 5000
±100 40 0 – 3000 0 – 1700 0 – 1700 100 5000
±200 20 0 – 3600 0 – 2100 0 – 1900 200 5000
±400 10 0 – 4200 0 – 2400 0 – 2000 400 5000

Each miniature, hermetically sealed package combines a MEMS capacitive sense element for DC measurement and a custom integrated circuit that includes a sense amplifier and differential output stage. This design ensures that the device remains relatively insensitive to temperature changes and gradients. Each package undergoes individual testing, programming, and calibration by SDI, and is marked with a serial number on its top and bottom surfaces for easy traceability. Additionally, a calibration test report (1531-TST) is included for every unit, displaying the accelerometer’s measured bias, scale factor, linearity, operating current, and frequency response specifications.

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Performance and Package Options

With its small surface mount footprint and durable, hermetically sealed construction, the SDI 1531 integrates seamlessly into space-constrained designs without compromising mechanical resilience or data integrity.

Package Dimensions

Package Dimensions

Performance – All Versions

All Models: Unless otherwise specified VDD=VR=5.0 VDC, Tc=25°C, Differential. Span = ±g range = 8000 mV

PARAMETER MIN TYP MAX UNITS
Bias Calibration Error (mV) 16 40 ± mV
Bias Calibration Error (Span) 0.2 0.5 ± % of span
Bias Temperature Shift (Tc= -55 to +125°C) 1 -200 0 +200 (PPM of span)/°C
Scale Factor Calibration Error 2 0.5 1 ± %
Scale Factor Temperature Shift (Tc= -55 to +125°C) 1 -200 0 +200 PPM/°C
Non-Linearity (-90 to +90% of Full Scale) 1,2 0.15 0.5 ± % of span
Long Term Bias Stability 1000 2000 ± PPM of span
Long Term Scale Factor Stability 500 1000 ± PPM
Cross Axis Sensitivity 2 3 ± %
Input Axis Misalignment 5 10 ± mrad
Turn-On Transient (in less than 0.5ms) 75 ± PPM of FS
Output Impedance 90 Ohms
Operating Voltage 2 4.75 5.0 5.25 Volts
Operating Current (IDD+IVR) 5.5 6.5 mA
Mass 0.68 grams
Case Operating Temperature -55 +175 degrees C
Storage Temperature -55 +175 degrees C
Max Reflow Solder Temperature +239 degrees C

Note 1: Tighter tolerances are available on other SDI accelerometers.
Note 2: For 5g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.
Note 3: Voltages on pins other than DV, GND or VDD may exceed 0.50 volt above or below the supply voltages provided the current is limited to 1 mA.

NOTICE: Minimize exposure above 155°C for maximum lifespan. Stresses greater than those listed above may cause permanent damage to the device. These are maximum stress ratings only. Functional operation of the device at or above these conditions is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability and lifespan.

Operational Highlights

The Model 1531 sensitive axis is perpendicular to the bottom of the package, with positive acceleration resulting from a positive force pushing on the bottom of the package.

The Model 1531 produces a differential ±4 volts output voltage, the value of which varies with acceleration as shown in the figure. The seismic center is located on a centerline through the dual sense elements halfway between them. Any errors due to rotation about this point are effectively cancelled by the internal electronics.

Two reference voltages, +5.0 and +2.5 volts (nominal), are required; scale factor is ratiometric to the +5.0 volt reference voltage relative to GND, and both outputs at zero acceleration are nominally the same as the +2.5 volt input.

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Frequently Asked Questions

Here are some of the most common questions we get about our MEMS accelerometers, and the answers that can help you move forward with confidence. For an extensive list, please visit our FAQ page.
Why does the accelerometer read zero G's when it's in free fall?

All accelerometers are used to measure increasing or decreasing acceleration, and they can detect vibration because it is a change in acceleration between multiple directions. Free fall, by definition, is a static acceleration, which means the object may be moving, but its acceleration is not changing at all. SDI’s MEMS DC accelerometer technology allows it to measure free fall because it doesn’t require any change of acceleration to supply data, and therefore it will report back 0g of acceleration.

How do I choose the right g-range for my application?

The g-range of your accelerometer should match the maximum acceleration your system is expected to experience—but avoid going unnecessarily high. Selecting too high of a g-range can reduce measurement clarity, while too low of a range can cause the sensor to saturate if the acceleration exceeds its limit. Also consider the frequency response. Each Silicon Designs sensor has a MEMS sense element tuned to its specific g-range, which affects its frequency range and noise profile. Be sure to check the product datasheet or visit our How To Choose Your Accelerometer guide for more detailed recommendations. You can also reach out to our team for help identifying the best fit for your application.

Optional Accessories

Silicon Designs offers a range of accessories designed to streamline installation, configuration, and testing. These include calibrated test sets, mounting blocks, and connector-ready adaptors, each built to support our accelerometers and extend their functionality with minimal added cost.
MODELS EB-L & EB-J ANALOG TEST SETS

MODELS EB-L & EB-J ANALOG TEST SETS
  • INFO
  • STATS
The zero-insertion-force socket is pre-fitted to the board, which includes set jumpers for advanced accelerometer features. A 10-pin connector and ribbon cable provide connection to an end-user's own test equipment. The EB-L Set, EB-J Set, and Silicon Designs surface mount MEMS DC accelerometers are each sold separately. Both Analog Test Sets are compatible with the Models 3330 and 3340 G-Logger data acquisition systems in chip mode. This powerful-yet-simple combination provides an exceptionally easy and intuitive chip test method, with assured compatibility with all test system components.
  • Compatible Sensor Models: 1521 I 1522 I 1525 I 1527 I 1531
  • Socket Types: JLCC or LCC
  • Includes:
    • Test board
    • ZIF socket
    • 10-pin ribbon cable
    • jumpers
  • Use with: SDI 3340 G-Logger DAQ
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Need Standard Temperature or Enhanced Thermal Precision?

For applications within the -55°C to +125°C range, consider the SDI 1521 or 1522. The 1522 is ideal for applications that demand lower bias and scale factor temperature coefficients, while the 1521 provides broad g-range options and reliable stability for general industrial use.
SDI 1521 SURFACE MOUNT ACCELEROMETERS

SDI 1521 SURFACE MOUNT ACCELEROMETERS
  • INFO
  • STATS
  • APPLICATIONS
The SDI Model 1521 Industrial-Grade Surface Mount Accelerometer offers exceptional ruggedness and precision in a compact footprint. Ideal for zero-to-medium frequency commercial and industrial applications, it supports ±2g to ±400g ranges and is available in both leadless LCC and J-Lead packages. Whether you're designing for automotive, robotics, seismic, or instrumentation systems, the 1521 ensures dependable sensing with unmatched stability.
  • Power: +5 VDC
  • Output:
    • Differential: +/- 4 V
    • Single Ended: +0.5V to +4.5V
  • Current: 5 mA
  • Mass: LCC: 0.62 grams
  • Package:
    • J-Lead 20 Pin LCC
    • Material: Gold & Ceramic
    • Size: 9mm x 9mm x 5mm
  • Temperature: -55 to +125°C
  • Elevator monitoring
  • Platform leveling
  • Flight test systems
  • Hostile environment R&D
  • Calibrating other accelerometers
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SDI 1522 SURFACE MOUNT ACCELEROMETERS

SDI 1522 SURFACE MOUNT ACCELEROMETERS
  • INFO
  • STATS
  • APPLICATIONS
The 1522 is the upgraded sister of the Model 1521, also for use between -55°C and +125°C. They've been individually temperature tested to have improved performance under more temperature-intensive applications with only half of the bias and scale factor over temperature than the 1521. The 1522 is ideal for applications that swing rapidly through the temperature range or persist at the hot or cold ends for long periods of time.
  • Power: +5 VDC
  • Output:
    • Differential: +/- 4 V
    • Single Ended: +0.5V to +4.5V
  • Current: 5 mA
  • Mass: LCC: 0.62 grams
  • Package:
    • J-Lead 20 Pin LCC
    • Material: Gold & Ceramic
    • Size: 9mm x 9mm x 5mm
  • Temperature: -55 to +125°C
  • Elevator monitoring
  • Platform leveling
  • Flight test systems
  • Hostile environment R&D
  • Calibrating other accelerometers
Explore Product
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Choosing the right accelerometer is critical. Our team supports its customers from selection through integration. Whether you need assistance with technical specifications, compliance requirements, or bulk order pricing, we are here to help.
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