LTC1440IN8#PBF

Overview

The LTC1440IN8#PBF is a micropower single comparator with a built-in 1.182V reference, housed in an 8-lead PDIP package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supply. The device draws 2.1µA typical supply current at 5V and features programmable hysteresis via the HYST pin. Outputs are CMOS/TTL compatible, sourcing up to 40mA. Propagation delay is 12µs with 10mV overdrive. Input common mode range extends from V– to V+ – 1.3V.

Feature Summary

• Built-in 1.182V voltage reference output capable of driving bypass capacitors
• Programmable hysteresis using external resistors connected to the HYST pin
• Glitch-free operation eliminating cross-conducting currents during state transitions
• CMOS outputs providing high current sourcing capability for direct logic interfacing

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free status and RoHS compliance as per manufacturer standards. Confirm the N8 package designation corresponds to the 8-lead PDIP form factor required for through-hole assembly. Ensure the temperature grade matches the application environment, as the 'C' suffix denotes commercial range while 'I' covers industrial temperatures.

Selection Notes

Select this component when ultralow quiescent current is critical for battery life extension. The integrated reference eliminates the need for external voltage sources, reducing bill of materials. Verify that the 12µs propagation delay meets timing requirements, as it is slower than high-speed alternatives. Ensure the input common mode range accommodates the signal levels relative to the negative supply rail.

Part Context

This part belongs to the LTC1440/LTC1441/LTC1442 family of ultralow power comparators. While the LTC1440 is a single channel, the LTC1441 offers dual channels without a reference, and the LTC1442 provides dual channels with a reference. All share similar electrical characteristics and low-power architecture designed for portable applications.

Replacement Considerations

Pin-compatible upgrades include the MAX921, MAX922, and MAX923 series. These devices offer similar functionality but may differ in specific electrical parameters such as supply current or offset voltage. Verify compatibility with existing circuit designs before substitution.