LM193AQT

Overview

The LM193AQT is a dual low-voltage comparator from STMicroelectronics, part of the LM193/LM293/LM393 family. It operates on a single supply from 2 V to 36 V or split supplies of ±1 V to ±18 V. Key electrical characteristics include a typical supply current of 0.45 mA (1 mW/comparator at 5 V), input bias current of 20 nA, and input offset voltage of ±1 mV. The device features an open-collector output with a typical saturation voltage of 80 mV at 4 mA sink current. It supports differential input voltages equal to the supply and includes ground in the common-mode range.

Feature Summary

• Dual independent comparators designed for wide single-supply or split power operation
• Input common-mode voltage range includes ground even with single supply
• Low power consumption with supply current independent of voltage level
• Outputs compatible with TTL, DTL, ECL, MOS, and CMOS logic families

Applications

• Battery-powered systems requiring low quiescent current
• Temperature sensing circuits using thermistors or RTDs
• Level detection and threshold monitoring applications
• Logic interface adapters between different voltage domains

Procurement Notes

Verify the specific suffix 'AQT' against official STMicroelectronics documentation to confirm package type (likely TSSOP8 or similar) and industrial temperature grade. Ensure the ordering code matches the exact pinout and mechanical dimensions required for your PCB layout. Cross-reference with the latest datasheet revision to confirm active status and any recent design changes.

Selection Notes

Select this component when dual comparators are needed with low power consumption and ground-referenced inputs. It is suitable for applications where the input signal swings near zero volts. Consider the open-collector output requirement for pull-up resistors. Verify that the 20 nA bias current meets the source impedance requirements of your application to maintain accuracy.

Part Context

The LM193AQT belongs to the broader LM193/LM293/LM393 family of low-voltage comparators. These devices share core electrical characteristics but differ in temperature ranges and packaging. The 'LM193' prefix typically denotes the commercial grade version. This family is widely used as a standard solution for general-purpose voltage comparison tasks in consumer and industrial electronics.

Replacement Considerations

Direct replacements include LM293, LM393, and LM393W from STMicroelectronics, provided package and temperature specifications align. Other manufacturers offer pin-compatible alternatives such as the MC3393 or TL331, though electrical parameters like offset voltage and bias current may vary. Always verify pinout compatibility and output drive capabilities before substitution.