LTC1542CS8#PBF

Overview

The LTC1542CS8#PBF is a micropower operational amplifier and comparator integrated in an 8-lead SOIC package. It operates from a single supply voltage range of 2.5V to 12.6V or dual supplies of ±1.25V to ±6.3V, with a typical supply current of 5µA. The op amp features rail-to-rail output swing, unity-gain stability, a gain-bandwidth product of 12kHz, and a slew rate of 8V/ms. The input common-mode range extends from the negative supply to within 1.3V of the positive supply. The comparator includes internal hysteresis of ±2.25mV for clean switching.

Feature Summary

• Combines a micropower op amp and comparator in a single 8-pin package
• Op amp output stage swings rail-to-rail while driving capacitive loads up to 1000pF
• Comparator features internal hysteresis to ensure clean output switching with slow-moving signals
• Input common-mode range includes ground and extends to near the positive supply rail

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 the specific suffix #PBF indicates lead-free compliance when ordering. Confirm the S8 package designation matches the required surface-mount footprint. Ensure the commercial grade temperature rating aligns with the intended operating environment. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability and revision status before finalizing procurement plans.

Selection Notes

Select this component when space is limited and both amplification and threshold detection are required in one package. The low quiescent current makes it suitable for battery-operated devices. Choose the industrial grade variant if operation below 0°C is necessary. Verify that the 12kHz bandwidth meets the signal processing requirements for the specific application design.

Part Context

This device belongs to the LTC1541/LTC1542 family of micropower mixed-signal ICs. While the LTC1541 integrates a bandgap reference, the LTC1542 omits this feature to provide a dedicated inverting comparator input. Both parts share identical pinouts and electrical characteristics for the op amp and comparator sections, allowing for flexible system design based on reference needs.

Replacement Considerations

The datasheet identifies the MAX951 and MAX953 as pin-compatible upgrades. Verify pinout compatibility and electrical specifications against these alternatives before substitution.