AMC3301DWER

Overview

The AMC3301DWER is a precision, reinforced isolated amplifier optimized for shunt-based current measurements. It features an integrated DC/DC converter enabling single-supply operation from the low side. The device provides a fixed gain of 8.2 V/V and supports a ±250 mV input voltage range. Key electrical specifications include a maximum offset voltage of ±150 µV, a gain error of ±0.2%, and a common-mode transient immunity (CMTI) of 85 kV/µs. It operates on a 3.3 V or 5 V supply with a bandwidth of 334 kHz and functions within an extended industrial temperature range of –40°C to +125°C.

Feature Summary

• Integrated isolated DC/DC converter allows single-supply operation from the low-side of the device.
• Reinforced capacitive isolation barrier certified according to DIN EN IEC 60747-17 and UL1577 standards.
• Optimized for direct connection to low-impedance shunt resistors with excellent DC accuracy.
• Includes system-level diagnostic features and fault-detection capabilities via a dedicated output pin.

Applications

• Isolated shunt-based current sensing in protection relays
• Current sensing in motor drives
• Isolated current monitoring in power supplies
• Shunt-based sensing in photovoltaic inverters

Procurement Notes

Verify that the specific orderable part number matches the required package variant and tape-and-reel quantity. Confirm that the design utilizes the correct low-side supply voltage (3.3 V or 5 V) as the integrated DC/DC converter requires this input. Ensure PCB layout adheres to the specified creepage and clearance distances to maintain the reinforced isolation ratings defined in the safety certifications.

Selection Notes

Select the AMC3301DWER when a fixed gain of 8.2 V/V and a ±250 mV input range are required for high-precision current sensing. This component is suitable for applications needing reinforced isolation with integrated power conversion to simplify board space. Consider alternative models if a different gain factor or input voltage range is necessary, as these parameters are fixed for this specific part number.

Part Context

The AMC3301DWER belongs to the AMC3301 family of precision isolated amplifiers manufactured by Texas Instruments. It is designed specifically for applications requiring galvanic isolation between high-voltage current sensing nodes and low-voltage control circuitry. The 'DWE' suffix indicates the 16-pin SOIC package type, while the 'R' suffix denotes the reel packaging format.

Replacement Considerations

Direct replacements must match the fixed gain of 8.2 V/V and the ±250 mV input range. Verify that any substitute component offers equivalent reinforced isolation ratings and integrated DC/DC functionality to maintain the single-supply architecture without redesigning the power stage.

FAQ

How does the integrated DC/DC converter affect the power supply requirements?

The integrated DC/DC converter allows the device to operate from a single low-side supply voltage (3.3 V or 5 V), eliminating the need for separate isolated power supplies for the high-side circuitry.

What is the purpose of the DIAG pin?

The DIAG pin is an active-low, open-drain digital output that serves as a status indicator for system-level diagnostics, such as detecting faults in the integrated DC/DC converter or high-side LDO.