MAX953EPA

Overview

The MAX953EPA is an ultra-low-power, single-supply analog device integrating a unity-gain stable operational amplifier, a comparator with internal hysteresis, and no internal reference. It operates from a 2.4V to 7V supply with a typical current of 5μA. The op amp features rail-to-rail outputs and inputs extending to the negative rail. The comparator provides clean switching with ±3mV hysteresis and can source up to 40mA. Packaged in an 8-pin plastic DIP for industrial applications.

Feature Summary

• Integrates a unity-gain stable op amp, comparator, and lacks an internal reference in one 8-pin package
• Ultra-low power consumption with 5μA typical supply current across the full operating range
• Comparator includes ±3mV internal hysteresis to ensure clean output switching with slow-moving signals
• Op amp and comparator inputs extend to the negative supply rail with rail-to-rail output swing

Applications

• Battery-powered portable instruments and terminals
• Low-frequency local-area alarms and detectors
• Smart card interfaces and infrared receivers for remote controls
• Smoke detectors and safety sensors utilizing high-impedance ionization chambers
• Photodiode preamplifiers requiring low noise and low power

Procurement Notes

Verify the specific temperature grade and package variant when sourcing replacements. The MAX953EPA denotes the -40°C to +85°C industrial range in an 8-pin plastic DIP. Confirm availability as this component may be subject to limited supply or end-of-life status depending on the manufacturer's production schedule.

Selection Notes

Select the MAX953EPA when a unity-gain stable op amp is required without an internal voltage reference. Choose this over the MAX951EPA if the design does not need the integrated 1.2V bandgap reference. Ensure the application benefits from the 5μA quiescent current compared to the 7μA draw of the referenced variants.

Part Context

The MAX953EPA belongs to the MAX951–MAX954 family of micropower mixed-signal devices. This series combines precision analog functions into compact 8-pin packages. The MAX953 specifically differentiates itself by omitting the internal reference found in the MAX951/MAX952, offering flexibility for external reference designs while maintaining the same low-power architecture.

Replacement Considerations

Official pin-compatible substitutes within the same family include the MAX953ESA (SOIC) and MAX953EUA (μMAX). For military-grade temperature ranges, the MAX953MJA is available. Ensure the replacement matches the required gain stability and supply voltage specifications.