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SDI 2470 & 2476 HIGH-PERFORMANCE ACCELEROMETERS
Three-axis MEMS accelerometers engineered for sensing over temperature with thermally stable signal output.
Meet the SDI 2470 & 2476: Triaxial Performance for High-Temp Environments
The SDI 2470 and 2476 are precision triaxial MEMS accelerometers designed for reliable sensing in unstable temperature environments. Each model integrates three low-noise accelerometers mounted orthogonally inside a rugged, anodized aluminum housing. The 2470 features an integrated 3-foot cable, while the 2476 offers a connector for more customized installations. Rated for operation up to +125°C, these modules are ideal for challenging test and measurement applications.
Key Performance Features
- Low Noise: 10 μg/√Hz Typical for ±2g Full Scale Versions
- -55 to +125°C Operating Temperature Range
- Acceleration and Vibration Sensing Across Three Orthogonal Axes
- Excellent Thermal Stability
- Flexible +8 to +32 VDC Power
- ±4V Differential Output or 0.5V to 4.5V Single Ended Output
- Responds to frequencies from zero (DC) to 4000+ Hz
- Low Impedance Outputs Support up to 2000 Feet of Cable
- Eight (8) Wire Connection, Choice of Integrated Cable or Connector
- Rugged Anodized Aluminum Case
- Fully Calibrated and Serialized for Traceability
High-Temperature Reliability, Signal Integrity, and Rugged Design
Designed to perform in unstable or elevated temperatures and mechanically harsh environments, the SDI 2470 and 2476 maintain reliable outputs across all three axes without sacrificing durability.
Thermally Stable by Design
These models maintain exceptional bias and scale factor accuracy, even under rapid or wide temperature swings. Precision-tuned electronics keep output stable, helping engineers avoid signal drift and recalibration delays.
Clean Signals in Noisy Environments
With a noise floor as low as 10 μg/√Hz, these high-performance MEMS accelerometers offer crisp, dependable data even when exposed to mechanical or electrical interference. Whether measuring vibration or even static acceleration, the output remains clean and reliable.
Rugged Construction That Performs Under Pressure
The epoxy-sealed, fully-potted, aluminum housing is designed to withstand most applications. These accelerometers are field-proven across aerospace and industrial platforms, consistently delivering precision sensing without degradation over time.
Compare Specifications
| 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) |
| ±2 | 2000 | 0 – 525 | 0 – 300 | 0 – 250 | 10 | 2000 |
| ±5 | 800 | 0 – 800 | 0 – 420 | 0 – 400 | 15 | 2000 |
| ±10 | 400 | 0 – 1100 | 0 – 660 | 0 – 700 | 23 | 5000 |
| ±25 | 160 | 0 – 1750 | 0 – 1050 | 0 – 1300 | 38 | 5000 |
| ±50 | 80 | 0 – 2100 | 0 – 1400 | 0 – 1600 | 60 | 5000 |
| ±100 | 40 | 0 – 3000 | 0 – 1700 | 0 – 1700 | 121 | 5000 |
| ±200 | 20 | 0 – 3600 | 0 – 2100 | 0 – 1900 | 243 | 5000 |
| ±400 | 10 | 0 – 4200 | 0 – 2400 | 0 – 2000 | 475 | 5000 |
The 2470 comes in a traditional 1-inch square package with an integrated cable and is operationally identical to the 2476, which features a connector instead of integrated cable for quick installations and removal without altering the cabling. The 2470 and 2476 incorporate three orthogonally mounted, hermetically sealed, low noise SDI Model 1522 surface mount accelerometers, which are individually tested, programmed, calibrated and verified in a climate chamber to ensure the greatest accuracy in thermally volatile conditions. The 2470 and 2476 include initial calibration reports detailing the test performance data.
Onboard voltage regulation and an internal voltage reference eliminate the need for precision power supplies. The robust, anodized aluminum case is epoxy sealed and can be mounted easily via two screws, an adhesive, or by attaching a magnet. Individual axis directions are marked on the case with positive acceleration defined as acceleration in the direction of the axis arrow.
Need Help Choosing the Right Accelerometer?
Performance and Packaging
Choose the 2470 for easy installations with a fixed cable, or the 2476 if your application requires flexible or custom cable lengths. Both models are compact and engineered to integrate quickly into testing environments.
Package Dimensions
Performance – All Versions
All Models: Unless otherwise specified, Vs=+8 to +32 VDC, TC=25°C, Differential Mode. Span = ±g range = 8000 mV.
| PARAMETER | MIN | TYP | MAX | UNITS |
|---|---|---|---|---|
| Bias Calibration Error (%) | 0.25 | 0.6 | ± % of span | |
| Bias Calibration Error (mV) | 25 | 60 | ± mV | |
| Scale Factor Calibration Error 1 | 0.5 | 1.25 | ± % | |
| Non-Linearity (-90 to +90% of span) 1 | 0.15 | 0.5 | ± % of span | |
| Bias Temperature Shift (Coefficient) | -100 | 0 | +100 | (PPM of span)/°C |
| Scale Factor Temperature Shift (Coefficient) | -150 | 0 | +50 | PPM/°C |
| Cross Axis Sensitivity | 2 | 3 | ± % | |
| Power Supply Rejection Ratio | 50 | >65 | dB | |
| Output Impedance | 1 | Ω | ||
| Output Common Mode Voltage | 2.5 | VDC | ||
| Operating Voltage | 8 | 32 | VDC | |
| Operating Current (AOP & AON open) | 19 | 23 | 27 | mA DC |
| Operating Temperature | -55 | +125 | °C | |
| Mass (not including cable) | 21 | grams | ||
| Cable Mass (3’ integrated cable, 2470) | 25 | grams/foot |
Note (1): For 2g thru 50g only; 100g and greater versions are tested and specified from -65 to +65g.
NOTICE: Stresses greater than those listed 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.
Operational Highlights
SDI Models 2470 and 2476 MEMS DC Accelerometers provide optimal performance when they are connected to instrumentation in a differential configuration using both the AOP and AON output signals, but they also support single ended operation for complete flexibility.
These accelerometers produce differential analog output voltage pairs (AON & AOP) which vary with acceleration. The signal outputs are fully differential about a common mode voltage of approximately 2.5 volts. At zero acceleration, the output differential voltage is nominally 0 volts DC; at ±full scale acceleration, the output is ±4 volts DC, respectively, as shown in the figure. The output scale factor is independent from the supply voltage of +8 to +32 volts.
When a differential connection is not possible, SDI recommends connecting the accelerometer to instrumentation in single ended mode by connecting AOP and GND to the instrumentation and leaving AON disconnected. Keep in mind the signal to noise ratio and sensitivity is reduced by half for a single-ended vs. a differential connection.
Frequently Asked Questions
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.
My accelerometer appears to be broken. When I place it on the desk with the lid facing up, it reads +1G. How do I fix this?
SDI’s MEMS DC accelerometers are designed to respond to the Earth’s gravity. If you are on Earth, then you are in a +1g gravitational field. Turn the device over and you will see a -1g reading, which you can use to perform your own bias calibration of the device. Visit our Technology page to learn more about how SDI’s accelerometers work. Also see the How to Calibrate Your Accelerometer page for how to use this feature for self-calibration.
Do I need a charge amplifier or signal conditioning to use my Silicon Designs MEMS DC accelerometer module?
All Silicon Designs MEMS DC accelerometers feature integrated amplifiers, so an additional one is not required. Signal conditioning is optional.
Are Silicon Designs plug-&-play MEMS DC accelerometer modules waterproof? What is their IP designation?
While all modules are considered weatherproof, only Models 2240 and 2480 may be used while submerged. We recommend the protection of the connector from exposure. Please Contact Us prior to use, and we’ll walk you through the process. The IP designation of the other modules is IP61.
Optional Accessories
MODEL 2232 MAGNETIC MOUNTING BLOCK
- INFO
- Rugged blue anodized aluminum construction
- Block mass = 23 grams
MODEL 2235 1-AXIS STUD MOUNT BLOCK
- INFO
- Rugged black anodized aluminum construction
- Block mass = 6.2 grams
Need a Single Axis Version?
MODEL 2220 1-AXIS MODULE
- INFO
- STATS
- APPLICATIONS
- Power: +8 to 32 VDC
-
Output:
- Differential: +/- 4 V
- Single Ended: +0.5V to +4.5V
- Connection: Integrated Cable
- Mass: 10 grams
- Package: Anodized Aluminum
- Temperature: -55 to +125°C
-
Available:
- 2g
- 5g
- 10g
- 25g
- 50g
- 100g
- 200g
- 400g
- aircraft vibration testing
- wind turbines
- race car monitoring
- aerial firefighting equipment
- semi truck stability tests
MODEL 2276 1-AXIS MODULE
- INFO
- STATS
- APPLICATIONS
- Power: +8 to 32 VDC
-
Output:
- Differential: +/- 4 V
- Single Ended: +0.5V to +4.5V
- Connection: Connector
- Mass: 8 grams
- Package: Anodized Aluminum
- Temperature: -55 to +125°C
-
Available:
- 2g
- 5g
- 10g
- 25g
- 50g
- 100g
- 200g
- 400g
- Construction equipment vibration
- Pipeline monitoring
- Roadway evaluation
- Automotive NVH
- Coal mine structural monitoring
Sales and Support
Reliable Customer Support from Start to Finish
Get a Quote
Our sales team is available to assist with pricing, lead times, and customized solutions tailored to your specific needs. We work closely with you to ensure you get the best accelerometer solution for your application.
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Tech Support
From initial setup to ongoing performance optimization, our technical support team provides expert guidance to ensure proper integration and reliable sensor operation.
Our Distributors
Our experienced U.S. sales representatives provide direct assistance for domestic customers, ensuring a smooth procurement process with personalized service. International customers can rely on our global distributor network for localized support, timely deliveries, and expert guidance in their regions.
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