AMC3311QDWERQ1

Overview

The AMC3311QDWERQ1 is an automotive-grade, precision isolated amplifier with a fixed gain of 1 V/V. It features a reinforced capacitive isolation barrier rated for up to 4250 VRMS and supports a working voltage of 1200 VRMS. The device includes an integrated DC/DC converter enabling single-supply operation from 3.0 V to 5.5 V. Key electrical characteristics include a maximum input offset voltage of 1 mV, a bandwidth of 275 kHz, and a common-mode transient immunity of 85 kV/µs. It operates within a temperature range of –40°C to +125°C.

Feature Summary

• Integrated isolated DC/DC converter enables single-supply operation from the low-side without requiring separate high-side power generation.
• Reinforced capacitive isolation barrier provides high resistance to magnetic interference and meets stringent safety certifications.
• High-impedance analog input stage optimized for direct connection to resistive dividers in high-voltage sensing applications.
• System-level diagnostic features including active-low status indicators for monitoring internal power supply integrity.

Applications

• Isolated voltage sensing in HEV/EV onboard chargers (OBC)
• Isolated voltage sensing in HEV/EV DC/DC converters
• Isolated voltage sensing in HEV/EV traction inverters

Procurement Notes

Verify that the component ordering suffix matches the required package type and tape-and-reel specifications. Confirm AEC-Q100 qualification status for the specific automotive grade intended. Ensure the design accounts for the wide-body SOIC-16 footprint dimensions and thermal dissipation requirements under maximum load conditions.

Selection Notes

Select this component when a fixed unity gain configuration is required for high-voltage signal isolation. The integrated power converter simplifies board layout by eliminating external high-side biasing components. Verify that the 2-V input full-scale range aligns with the sensor divider output before finalizing the design.

Part Context

This part belongs to the AMC3311-Q1 family of precision isolated amplifiers designed for automotive environments. It utilizes delta-sigma modulation technology to transfer signals across the isolation barrier. The device is manufactured by Texas Instruments and is housed in a 16-pin wide-body SOIC package suitable for surface-mount assembly.

Replacement Considerations

AMC3311DWER

FAQ

How does the AMC3311QDWERQ1 handle high-side power supply?

The device contains an integrated isolated DC/DC converter that generates the necessary high-side voltage from the low-side supply, allowing for single-supply operation.

What is the isolation barrier type used in this amplifier?

The AMC3311QDWERQ1 uses a reinforced capacitive isolation barrier based on double silicon-dioxide insulation, which offers high immunity to magnetic interference.