LTC1445IN#PBF

Overview

The LTC1445IN#PBF is an ultralow power quad comparator with a built-in reference, housed in a 16-lead PDIP package. It operates from a single 2V to 11V supply or dual ±1V to ±5.5V supply. The device features a 1.221V ±1% internal reference and TTL/CMOS compatible outputs capable of sourcing up to 40mA. Supply current is less than 8.5µA over temperature. Input common mode range extends from the negative supply to within 1.3V of the positive supply. Propagation delay is typically 12µs at 10mV overdrive.

Feature Summary

• Built-in voltage reference output capable of driving bypass capacitors without oscillation
• TTL/CMOS compatible outputs that sink and source current
• Programmable hysteresis via external resistors connected to the HYST pin
• Elimination of crowbar switching currents during logic state transitions

Applications

• Battery-powered system monitoring
• Threshold detectors
• Window comparators
• Oscillator circuits

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm lead-free finish compliance if RoHS standards are mandatory for the assembly process. Ensure the procurement channel sources genuine Analog Devices components to guarantee electrical characteristics align with datasheet specifications.

Selection Notes

Select this component when low quiescent current is critical alongside the need for multiple comparator channels. The integrated reference simplifies design by removing external precision voltage sources. Verify that the input signal range remains within the specified common mode limits relative to the chosen supply voltage configuration.

Part Context

This part belongs to the LTC1443/LTC1444/LTC1445 family of micropower comparators. While sharing similar core architecture, the LTC1445 specifically provides TTL/CMOS outputs and a 1.221V reference, distinguishing it from the open-drain LTC1444 and ground-referenced LTC1443 variants.

Replacement Considerations

LTC1443IN#PBF and LTC1444IN#PBF are pin-compatible upgrades within the same family. Verify output stage requirements (open-drain vs. push-pull) and reference voltage accuracy before substituting.