AMC21C12DENR

Overview

The AMC21C12 is a fast-response, functionally isolated window comparator with an adjustable threshold and optional latch function. It features a wide high-side supply range of 3 V to 27 V and a low-side supply range of 2.7 V to 5.5 V. The device provides a trip threshold error of ±1% (max) at 250 mV and supports a propagation delay of 280 ns typical. It offers high common-mode transient immunity of 55 V/ns minimum and functional isolation up to 200 VRMS working voltage. The open-drain output operates in transparent or latch modes, controlled by the LATCH input.

Feature Summary

• Galvanic isolation barrier resistant to magnetic interference supporting high working voltages
• Adjustable comparison window centered at 0 V via single external resistor
• Open-drain output with selectable transparent or latch mode operation
• Positive-comparator mode for monitoring positive voltage supplies

Applications

• Overcurrent detection in telecom power supplies
• Overvoltage detection in analog I/O modules
• Protection circuits in motor drives
• Fault detection in frequency inverters

Procurement Notes

Verify the specific ordering suffix 'DENR' corresponds to the VSON-8 package and reel packaging configuration. Confirm that the component meets RoHS compliance requirements for your assembly process. Ensure the design accounts for the extended industrial temperature range specifications during procurement planning.

Selection Notes

Select this component when high-speed response and galvanic isolation are required for current or voltage sensing. The adjustable threshold allows flexibility for shunt-based current monitoring or direct voltage supervision. Consider the small VSON package size for space-constrained designs requiring robust magnetic field immunity.

Part Context

The AMC21C12 belongs to Texas Instruments' family of isolated comparators designed for harsh electrical environments. It integrates a SiO2-based capacitive isolation barrier to separate high-voltage inputs from low-voltage digital outputs. This architecture ensures signal integrity while protecting downstream control circuitry from high common-mode transients.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.