LTC1440CS8#PBF

Overview

The LTC1440CS8#PBF is a micropower single comparator with an integrated 1.182V reference, housed in an 8-lead SOIC package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supply. The device features a typical supply current of 2.1µA and CMOS outputs capable of sourcing up to 40mA. Key electrical parameters include a propagation delay of 12µs at 10mV overdrive, an input offset voltage of ±3mV, and a common mode range extending from the negative supply to V+ minus 1.3V.

Feature Summary

• Integrated 1.182V bandgap reference output capable of driving bypass capacitors without oscillation
• Glitch-free CMOS output stage that eliminates crowbar switching currents during logic transitions
• Programmable hysteresis via external resistors connected to the HYST pin
• Wide input common mode range including the negative supply rail

Applications

• Battery-powered system monitoring
• Micropower threshold detectors
• Window comparators
• Oscillator circuits

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when ordering. Confirm the 'C' grade designation corresponds to the commercial operating temperature range of 0°C to 70°C. Ensure the SOIC-8 package dimensions match the target PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring ultralow quiescent current consumption alongside a built-in voltage reference. It is suitable for designs needing programmable hysteresis without external components. Consider the 40mA output drive capability if direct interfacing with digital logic or low-impedance loads is required.

Part Context

This part belongs to the LTC1440/LTC1441/LTC1442 family of ultralow power comparators. While the LTC1440 provides a single channel with a reference, the LTC1441 offers dual channels without a reference, and the LTC1442 provides dual channels with a reference. All share similar electrical characteristics and package options.

Replacement Considerations

The datasheet identifies the MAX921, MAX922, and MAX923 as pin-compatible upgrades. Verify functional equivalence regarding supply voltage ranges and output drive capabilities before substitution.