AS1972-T

Overview

The AS1972-T is a low-voltage dual comparator manufactured by ams-OSRAM USA INC. It operates with single supplies from 2.5V to 5.5V or dual supplies of ±1.25V to ±2.75V. The device features a push/pull output stage capable of sourcing and sinking up to 8mA, ensuring rail-to-rail output swings. Key electrical characteristics include a typical quiescent supply current of 18µA per comparator at 5V, a propagation delay of 300ns, and an internal hysteresis of 3mV. The common-mode input voltage range extends 250mV beyond the supply rails, and the unit is housed in an 8-pin MSOP package.

Feature Summary

• Dual comparator configuration with CMOS push/pull output stage
• Internal hysteresis for clean switching on slow input signals
• Rail-to-rail output capability with high drive strength
• Extended common-mode input voltage range beyond supply rails

Applications

• Battery-powered systems
• Zero-crossing detectors
• Window comparators
• Logic-level translators
• Threshold detectors and discriminators

Procurement Notes

Verify the specific ordering suffix '-T' corresponds to tape and reel packaging rather than tubes when sourcing components. Confirm that the manufacturer designation aligns with current ams AG branding as austriamicrosystems AG has been acquired. Ensure compatibility with standard surface-mount reflow profiles specified in the datasheet for the 8-pin MSOP package.

Selection Notes

Select this component for applications requiring low power consumption and fast response times within a 2.5V to 5.5V supply range. The push/pull output eliminates the need for external pull-up resistors required by open-drain variants. Consider the 8-pin MSOP package for space-constrained designs where dual independent comparison functions are necessary.

Part Context

This part belongs to the AS1970-AS1975 family of low-voltage comparators. The AS1972 variant specifically provides two independent comparators in a compact footprint. It shares core architectural features with the single (AS1970) and quad (AS1974) versions, including the same input stage characteristics and output driver capabilities, differing primarily in channel count and pinout configuration.

Replacement Considerations

Direct functional substitutes within the same series include the AS1972 (tube version) for non-reel applications. For open-drain requirements, the AS1973 serves as the logical alternative. Designers should verify pin compatibility and ensure that the push/pull output characteristics meet the load requirements of the target circuit.

FAQ

Does the AS1972-T support logic level translation between 3V and 5V systems?

Yes, the device can function as a logic-level translator. When powered by a 5V supply, it can interface with 3V logic inputs without causing overvoltage issues, provided the input signals remain within the extended common-mode range.

What is the maximum output current capability of the AS1972-T?

The internal output drivers can source or sink up to 8mA, allowing for direct driving of loads without additional buffering components while maintaining rail-to-rail output swings.