Isolated Amplifier for Current Shunt Measurement

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The Si8920 is a galvanically isolated analog amplifier. The low-voltage differential input is ideal for measuring voltage across a current shunt resistor or for any place where a sensor must be isolated from the control system. The output is a differential analog signal amplified by either 8.1x or 16.2x.

The very low signal delay of the Si8920 allows control systems to respond quickly to fault conditions or changes in load. Low offset and gain drift ensure that accuracy is maintained over the entire operating temperature range. Exceptionally high commonmode transient immunity means that the Si8920 delivers accurate measurements even in the presence of high-power switching as is found in motor drive systems and inverters.

The Si8920 isolated amplifier utilizes Silicon Labs’ proprietary isolation technology. It supports up to 5.0 kVrms withstand voltage per UL1577. This technology enables higher performance, reduced variation with temperature and age, tighter part-to-part matching, and longer lifetimes compared to other isolation technologies.

Automotive Grade is available for certain part numbers. These products are built using automotive-specific flows at all steps in the manufacturing process to ensure the robustness and low defectivity required for automotive applications.

Industrial Applications:
• Industrial and renewable energy inverters
• AC, Brushless, and DC motor controls and drives
• Variable speed motor control in consumer white goods
• Isolated switch mode and UPS power supplies

Safety Regulatory Approvals:
• UL 1577 recognized
• Up to 5000 Vrms for 1 minute
• CSA component notice 5A approval
• IEC 60950-1 (reinforced insulation)
• VDE certification conformity
• VDE0884 Part 10 (basic/reinforced insulation)
• CQC certification approval
• GB4943.1

Automotive Applications:
• Hybrid and EV traction inverters
• Onboard chargers
• Charging pedestals

Symmetry Electronics is an authorized Silicon Labs distributor.


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Low voltage differential input: 100 mV and 200 mV options
Low signal delay: 0.75 s
Input offset: 0.2 mV
Gain error: <0.5%
Excellent drift specifications:
- 1 V/C offset drift
- 10 ppm/C gain drift
Nonlinearity: 0.025% full-scale
Low noise: 0.10 mVrms over 100 kHz bandwidth
High common-mode transient immunity: 75 kV/s
Compact packages:
- 16-pin wide body SOIC
- 8-pin surface mount DIP
Temp Range: 40 to 125 C
Automotive-grade OPNs available
- AIAG compliant PPAP documentation support
- IMDS and CAMDS listing support


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