LTC1542IS8#PBF

Overview

The LTC1542IS8#PBF is a micropower analog comparator housed in an 8-lead SOIC package. It operates from a single supply voltage ranging from 2.5V to 12.6V, or dual supplies of ±1.25V to ±6.3V, with a typical supply current of 5µA. The device features rail-to-rail output capability and includes internal hysteresis of ±2.25mV for clean switching. Input common mode range extends from the negative supply to within 1.3V of the positive supply.

Feature Summary

• Integrates a high-impedance differential input stage with rail-to-rail CMOS output
• Features internal hysteresis to ensure stable switching with slow-moving signals
• Supports unity-gain stability while driving capacitive loads up to 1000pF

Applications

• Battery-powered systems
• Automotive keyless entry
• Low frequency local area alarms and detectors
• Infrared receivers for remote controls
• Smoke detectors and safety sensors

Procurement Notes

Verify that the IS8 suffix corresponds to the Industrial Grade (-40°C to +85°C) performance specifications rather than Commercial Grade. Confirm the S8 package designation matches the required 8-lead plastic small outline footprint on the target PCB layout. Ensure the #PBF lead-free marking aligns with environmental compliance requirements.

Selection Notes

Select this component when low quiescent current is critical alongside precise signal comparison. The internal hysteresis eliminates the need for external feedback components in noisy environments. Verify that the input signal amplitude exceeds the trip point threshold relative to the reference level for reliable operation.

Part Context

This part belongs to the LTC1541/LTC1542 family of micropower amplifiers and comparators. While the LTC1541 integrates a bandgap reference connected to the comparator's inverting input, the LTC1542 provides a dedicated inverting input pin for external reference control. Both share identical op amp characteristics and package options.

Replacement Considerations

The datasheet identifies the MAX951 and MAX953 as pin-compatible upgrades. Verify electrical parameter compatibility before substitution.