AS1972

Overview

The AS1972 is a low-voltage dual comparator from the AS1970 series, manufactured by ams OSRAM. It operates on 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. Key electrical characteristics include a typical quiescent supply current of 18µA (at 5V), a propagation delay of 300ns with 100mV overdrive, and an input offset voltage of 0.5mV. Internal hysteresis is fixed at 3mV. The common-mode input voltage range extends 250mV beyond the supply rails.

Feature Summary

• Dual-channel architecture with CMOS push/pull output stage for rail-to-rail operation
• Internal 3mV hysteresis ensures clean switching without external components
• Common-mode input voltage range extends 250mV above and below supply rails
• Low power consumption with minimal supply current surges during transitions

Applications

• Battery-powered systems and mobile communication devices
• Zero-crossing detectors and threshold discriminators
• Logic-level translators between 3V and 5V domains
• Window comparators and ground/supply-sensing circuits

Procurement Notes

Verify the specific ordering suffix when purchasing. The datasheet lists AS1972 in tubes and AS1972-T in tape and reel. Confirm the package type matches the design requirements. Ensure the supplier provides documentation confirming the component originates from ams AG or its authorized successors, as austriamicrosystems AG has undergone corporate restructuring.

Selection Notes

Select the AS1972 when a dual comparator solution is required with push/pull outputs. This model is suitable for applications needing rail-to-rail swings and high drive capability up to 8mA. Consider the AS1973 if open-drain outputs are preferred instead. Verify that the 300ns propagation delay meets the system timing constraints for the intended switching frequency.

Part Context

The AS1972 belongs to the AS1970-AS1975 family of low-voltage comparators originally designed by austriamicrosystems AG, now ams AG. The family includes single, dual, and quad variants with either push/pull or open-drain outputs. These devices were engineered for 3V and 5V logic applications, offering high speed and low power consumption in compact surface-mount packages like MSOP.

Replacement Considerations

Direct functional substitutes within the same family include the AS1973, which shares the same pinout and specifications but utilizes an open-drain output configuration instead of push/pull.