LTC1541IS8#TRPBF

Overview

The LTC1541IS8#TRPBF is a micropower operational amplifier, comparator, and bandgap reference integrated in an 8-lead SOIC package. It operates from a single supply 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, and a gain-bandwidth product of 12kHz. The comparator includes internal hysteresis of ±2.25mV and has its inverting input internally connected to the 1.2V reference output.

Feature Summary

• Combines a micropower op amp, comparator, and 1.2V reference in a single 8-pin package
• Op amp output stage swings rail-to-rail while driving capacitive loads up to 1000pF
• Comparator provides clean switching via internal hysteresis even with slow-moving signals
• Input common mode range extends from the negative supply to within 1.3V of the positive supply

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 ordering suffix #TRPBF confirms tape and reel packaging and lead-free status. Confirm the IS8 designation corresponds to the industrial temperature grade (-40°C to +85°C) and the SOIC-8 package type. Ensure compatibility with the specific Analog Devices manufacturing lot requirements.

Selection Notes

Select this component when space-constrained designs require a combined amplification, comparison, and reference function. It is suitable for applications demanding low quiescent current and high input impedance. Verify that the 12kHz bandwidth meets the signal processing speed requirements and that the 1.2V reference voltage aligns with system thresholds.

Part Context

This part belongs to the LTC1541/LTC1542 family of micropower mixed-signal ICs. The IS8 variant specifically denotes the industrial temperature range and narrow SOIC package. It serves as a pin-compatible upgrade for legacy parts like the MAX951/MAX953, offering improved performance in a compact footprint.

Replacement Considerations

LTC1541IS8#PBF (Tube version)

FAQ

How does the LTC1541 handle capacitive loads on the op amp output?

The op amp is internally compensated to remain stable in unity-gain configuration while driving capacitive loads up to 1000pF without oscillation.

What is the function of Pin 6 on the LTC1541?

Pin 6 serves as the Reference Output, providing a 1.2V ±1% bandgap reference voltage that is also internally connected to the inverting input of the comparator.