AS1973-T

Overview

The AS1973-T is a low-voltage dual comparator from the AS1970 series, manufactured by ams-OSRAM USA INC. It operates on single supplies from 2.5V to 5.5V or dual supplies of ±1.25V to ±2.75V. The device features an open-drain output capable of being pulled beyond VCC up to 5.5V > VEE. Key electrical characteristics include a quiescent supply current as low as 8.5µA per comparator, a typical propagation delay of 300ns, and internal hysteresis of 3mV. It is housed in an 8-pin MSOP package.

Feature Summary

• Open-drain output stage allows voltage extension beyond VCC for logic-level translation
• Internal hysteresis ensures clean switching with slow input signals
• Common-mode input voltage range extends 250mV above and below supply rails
• Rail-to-rail output swing capability with loads up to 8mA

Applications

• Battery-powered systems and mobile communication devices
• Zero-crossing detectors and window comparators
• Logic-level translators between 3V and 5V domains
• Threshold detectors and ground/supply-sensing applications

Procurement Notes

Verify the specific ordering suffix '-T' corresponds to the tape and reel delivery form rather than tube packaging when sourcing components. Confirm the manufacturer designation aligns with ams AG or ams-OSRAM USA INC., as the original austriamicrosystems technical content remains valid under these entities. Ensure the component matches the 8-pin MSOP physical footprint requirements for your PCB layout.

Selection Notes

Select the AS1973-T over push/pull variants when the application requires an open-drain output that can interface with higher voltage logic levels via an external pull-up resistor. This model is suitable for designs needing minimal supply current consumption while maintaining fast propagation delays. Consider the extended common-mode input range if signal sources exceed standard supply rail boundaries.

Part Context

This component belongs to the AS1970-AS1975 family of low-power comparators designed for 3V and 5V applications. The series includes single, dual, and quad configurations with either push-pull or open-drain outputs. The AS1973 specifically provides two independent comparators in a compact surface-mount package, balancing performance with space constraints in portable electronics.

Replacement Considerations

Compatible substitutes within the same family include the AS1972-T (push-pull output) or AS1971-T (single channel). Cross-family replacements require matching the 8.5µA supply current, 300ns propagation delay, and 2.5V-5.5V operating voltage range. Verify pin compatibility for the 8-pin MSOP package before integration.