LM393PS

Overview

The LM393PS is a dual differential voltage comparator manufactured by Texas Instruments, housed in an 8-pin SOIC surface-mount package. It operates within a supply voltage range of 2 V to 30 V and supports temperatures from 0°C to 70°C. Key electrical parameters include a typical response time of 1.3 µs, a maximum input offset voltage of 5 mV, and an input bias current of 50 nA. The device features open-collector outputs compatible with CMOS and TTL logic, drawing a typical supply current of 2.5 mA.

Feature Summary

• Dual independent precision voltage comparators designed for single or split power supplies
• Open-collector output configuration allows direct interfacing with various logic families including TTL, DTL, MOS, and CMOS
• Input common-mode voltage range includes ground, enabling sensing near ground potential
• Low power supply current drain that remains independent of the magnitude of the power supply voltage

Applications

• Limit comparators
• Simple analog-to-digital converters
• Pulse, squarewave, and time delay generators
• Wide range voltage-controlled oscillators (VCO)
• MOS clock timers and multivibrators

Procurement Notes

Verify the specific suffix against the manufacturer's official datasheet to confirm pinout compatibility and electrical tolerances. Ensure the selected variant matches the required operating temperature range and package dimensions for your PCB layout. Cross-reference the ordering information with the latest TI documentation to avoid discrepancies between legacy part numbers and current production versions.

Selection Notes

Select this component when low power consumption and ground-referenced input sensing are critical requirements. The open-collector output necessitates an external pull-up resistor; ensure the chosen resistor value aligns with the target logic family's voltage levels and switching speed requirements. Consider the input offset voltage specifications if high-precision threshold detection is necessary for the application design.

Part Context

The LM393 belongs to the industry-standard LM393 comparator family, which has been widely used for decades in general-purpose analog signal processing. This series is known for its versatility in single-supply applications where dual supplies are unavailable. The PS suffix indicates a plastic small-outline package, distinguishing it from through-hole DIP variants while maintaining functional equivalence within the core device architecture.

Replacement Considerations

LM393DR

FAQ

Can the LM393PS operate with dual power supplies?

Yes, the device is designed to operate from both single and split power supplies, supporting ranges such as ±1 V to ±18 V.

What is the maximum input common-mode voltage range?

The input common-mode voltage range includes ground, allowing the device to sense signals down to the negative rail even when powered by a single supply.