LM393QT

Overview

The LM393QT is a dual low-voltage comparator from STMicroelectronics, part of the LM193/LM293/LM393 family. It operates from a single supply voltage range of 2 V to 36 V or split supplies of ±1 V to ±18 V. The device features very low supply current of 0.45 mA independent of supply voltage, resulting in 1 mW consumption per comparator at 5 V. Key electrical characteristics include a typical input bias current of 20 nA, input offset current of ±3 nA, and input offset voltage of ±1 mV. The input common-mode voltage range includes ground. The output saturation voltage is typically 80 mV with a sink current of 4 mA. Outputs are compatible with TTL, DTL, ECL, MOS, and CMOS logic families.

Feature Summary

• Dual independent comparators designed for single-supply operation over a wide voltage range
• Input common-mode voltage range includes ground potential
• Low power consumption with supply current independent of voltage level
• Open-collector outputs compatible with various digital logic families

Applications

• Battery-powered systems requiring low quiescent current
• On-thermostat control circuits
• Automatic triggering circuits
• Voltage monitoring and level detection

Procurement Notes

Verify the QT suffix indicates automotive qualification status against the official STMicroelectronics datasheet. Confirm the package type matches the required PCB footprint, as the LM393 family is available in multiple packages including SO8, TSSOP8, MiniSO8, and DFN8. Ensure the specific revision and manufacturing date code meet project requirements. Cross-reference the ordering code with the manufacturer's current product availability list to confirm active status.

Selection Notes

Select this component when dual comparators are needed with single-supply operation down to 2 V. The LM393QT is suitable for applications requiring ground-referenced input signals. Consider the open-drain output structure which requires external pull-up resistors. Compare propagation delay and offset voltage specifications against other variants if high precision or speed is critical. Verify temperature range compliance for the specific environment.

Part Context

The LM393QT belongs to the industry-standard LM393 family of dual comparators manufactured by STMicroelectronics. This family is widely used in general-purpose analog signal processing. The 'QT' suffix typically denotes an automotive-grade variant, implying stricter reliability and quality standards compared to commercial versions. It shares functional compatibility with other manufacturers' LM393 equivalents while offering ST-specific packaging and qualification options.