Analog Devices Inc./Maxim Integrated MAX973ESA-T

Overview

The MAX973ESA-T from Maxim Integrated is a dual, ultra-low-power, open-drain comparator with integrated 1.182V ±1% voltage reference and programmable hysteresis via HYST pin. It operates from single 2.5V–11V or dual ±1.25V–±5.5V supplies, draws ≤4µA supply current over temperature, supports rail-to-rail input (V− to V+ − 1.3V), and targets battery-powered threshold detection and window comparator applications.

For engineers reviewing the MAX973ESA-T datasheet, MAX973ESA-T pinout, MAX973ESA-T application, or MAX973ESA-T equivalent, key selection criteria include its dual-comparator architecture with shared reference, HYST-pin hysteresis programming capability, 12µs propagation delay at 10mV overdrive, separate GND-referenced output stage, and SO-8 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The MAX973ESA-T integrates two independent comparators sharing a precision 1.182V ±1% bandgap reference and a dedicated HYST pin enabling user-programmable hysteresis without external feedback. Its input common-mode range extends from V− to V+ − 1.3V, supporting operation near supply rails in single- or dual-supply configurations.

Each comparator features an open-drain N-channel output sinking to GND (not V−), enabling wire-ORing and level translation up to 11V. The internal reference is referenced to V−, sources up to 25µA, and exhibits <100µVRMS noise (100Hz–100kHz); comparator input offset is ±10mV, and input leakage is ±0.01nA typical.

Key Specifications

Pinout & Package

MAX973ESA-T is housed in an 8-pin SO (Small Outline) package with gull-wing leads, compliant with JEDEC MS-012, body size 4.9mm × 6.0mm, pitch 1.27mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-comparator applications.

Compared with MAX973ESA-T, MAX973CUA offers smaller footprint but lacks extended temperature support, while MAX983ESA trades reference precision and quiescent current for lower unit cost-neither is pin-compatible drop-in replacements but serve overlapping functional roles in less demanding environments.

Availability

MAX973ESA-T is available at Aetrix Electronics and suitable for battery-powered systems, power-supply supervision, industrial sensor interfaces, and portable medical devices requiring stable component supply across extended temperature ranges.

Supply support for MAX973ESA-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and signal conditioning in demanding environments.

The MAX97x/MAX98x comparator family was engineered for ultra-low-power, high-accuracy threshold detection in energy-constrained systems-emphasizing micropower operation, integrated references, and flexible hysteresis control.

FAQ

What is the maximum supply voltage for MAX973ESA-T?

The MAX973ESA-T supports a single-supply voltage range of 2.5V to 11V or dual supplies of ±1.25V to ±5.5V. Absolute maximum ratings specify V+ to V− up to 12V, but continuous operation above 11V may risk reliability. The output voltage swing can reach up to 11V above V−, even with no supply applied-enabling true level-shifting functionality independent of V+.

Does MAX973ESA-T require external hysteresis components?

No-MAX973ESA-T includes a dedicated HYST pin that enables programmable hysteresis using just two external resistors between REF, HYST, and V−. This eliminates the need for external feedback networks or op-amp-based hysteresis circuits. When unused, HYST must be tied directly to REF to disable hysteresis. The hysteresis band is adjustable from 0mV up to 100mV, centered on the comparator's switching threshold.

Can MAX973ESA-T operate from a 3V single supply?

Yes-MAX973ESA-T is fully specified for 3V single-supply operation (V+ = 3V, V− = GND). At 3V, supply current remains ≤4µA over temperature, input common-mode range spans 0V to 1.7V, and propagation delay is 12µs at 10mV overdrive. The internal 1.182V reference remains stable and accurate, making it ideal for 3V microcontroller interfacing and low-voltage battery monitoring.

What is the function of the GND pin on MAX973ESA-T?

The GND pin (Pin 1) on MAX973ESA-T serves as the reference for the open-drain output stage-not the internal circuit ground. It allows the output transistor to sink current directly to system ground, enabling level translation when V+ and V− are referenced to different potentials (e.g., ±5V supplies). In single-supply operation, GND and V− are typically tied together; in dual-supply mode, GND remains connected to system ground while V− is driven negative.

Is the reference voltage on MAX973ESA-T referenced to GND or V−?

The 1.182V reference voltage on MAX973ESA-T is referenced to V−, not GND. This means REF = V− + 1.182V, so its absolute voltage depends on the V− potential. For example, in a single-supply configuration with V− = GND, REF = 1.182V; in a dual-supply setup with V− = −5V, REF = −3.818V. This architecture preserves common-mode integrity across supply configurations and simplifies resistor-divider design for threshold setting.