MAX953ESA+

Overview

The MAX953ESA+ is an ultra-low-power, single-supply integrated circuit combining a unity-gain stable operational amplifier and a comparator within an 8-pin SO package. It operates from a supply voltage range of 2.4V to 7V with a typical supply current of 5μA. The device features rail-to-rail outputs and input common-mode ranges extending from the negative rail to within 1.6V of the positive rail. Unlike the MAX951/952, this variant lacks an internal reference, offering flexibility for custom biasing while maintaining high DC accuracy and low noise characteristics suitable for battery-powered applications.

Feature Summary

• Combines a unity-gain stable op amp and a comparator in a compact 8-pin SO package
• Ultra-low power consumption with 5μA typical supply current
• Rail-to-rail output stages for maximum dynamic range
• Internal comparator hysteresis ensures clean switching with slow-moving signals

Applications

• Battery-powered portable instruments and terminals
• Low-frequency local-area alarms and detectors
• Photodiode preamplifiers for sensor interfaces
• Smart card interface circuits
• Infrared receivers for remote control systems

Procurement Notes

Verify the suffix 'ESA' confirms the 8-pin Small Outline package and -40°C to +85°C industrial temperature range. Ensure the '+' indicates RoHS compliance. Confirm availability through authorized Analog Devices or Maxim Integrated distributors. Check for lead-free soldering compatibility if required by assembly processes.

Selection Notes

Select the MAX953ESA+ when a unity-gain stable op amp is required without an internal reference voltage source. Choose this part over the MAX951/952 variants if external reference precision or specific biasing is preferred. Consider the MAX952/954 series only if higher bandwidth (125kHz) and stability for gains of 10V/V or greater are necessary for the application.

Part Context

This component belongs to the MAX951–MAX954 family of micropower mixed-signal devices manufactured by Analog Devices Inc./Maxim Integrated. The family provides various combinations of op amps, comparators, and references. The MAX953 specifically excludes the internal bandgap reference found in the MAX951 and MAX952, allowing designers to implement custom reference circuits while retaining the low-power op amp and comparator functionality.

Replacement Considerations

Official substitutes include other members of the MAX95x family such as the MAX951ESA+, MAX952ESA+, or MAX954ESA+. Selection depends on whether an internal reference is needed and if unity-gain or decompensated op amp stability is required. Package and temperature range must match the original design constraints.

FAQ

Does the MAX953ESA+ include an internal voltage reference?

No, the MAX953 does not contain an internal reference. The comparator's inverting input is not connected to an internal bandgap reference, unlike the MAX951 and MAX952.

What is the input common-mode voltage range for the op amp?

The common-mode input voltage range extends from the negative supply rail (VSS) to within 1.6V of the positive rail (VDD).

Is the op amp in the MAX953 stable at unity gain?

Yes, the op amp in the MAX953 is internally compensated to be unity-gain stable, making it suitable for direct feedback configurations without additional compensation components.