Analog Devices Inc./Maxim Integrated MAX972CUA-T

Overview

The MAX972CUA-T from Maxim Integrated is a single, ultra-low-power, open-drain comparator with no internal voltage reference and no programmable hysteresis, housed in an 8-pin µMAX package. It operates from a single 2.5V to 11V supply (or ±1.25V to ±5.5V dual supplies), features rail-to-rail input capability down to the negative supply rail and within 1.3V of V+, draws ≤4µA quiescent current over temperature, and delivers 12µs propagation delay at 10mV overdrive - ideal for battery-powered threshold detection in portable instrumentation.

For engineers reviewing the MAX972CUA-T datasheet, MAX972CUA-T pinout, MAX972CUA-T application, or MAX972CUA-T equivalent, this page provides verified technical context, exact pin functions, real-world use cases including level translation and window detection, and validated alternative parts with documented functional and application-level differences.

Technical Context

The MAX972CUA-T implements a single micropower comparator core with open-drain NMOS output sinking to V− (not GND), requiring an external pull-up. Its input stage supports common-mode voltages from V− to (V+ − 1.3V), enabling operation in single-supply systems where inputs may approach ground. Unlike MAX971/MAX982 variants, it lacks both internal 1.182V reference and HYST pin - hysteresis must be added externally via positive feedback.

No internal reference or hysteresis control means the device relies entirely on external circuitry for threshold setting and noise immunity. The output's V−-referenced sink path supports bipolar-to-single-ended conversion when V− is tied to a negative rail, and its 11V output voltage range permits level-shifting across disparate logic domains without additional biasing.

Key Specifications

Pinout & Package

Package: 8-pin µMAX (3mm × 3mm, 0.8mm height, exposed pad), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX982CUA-T and TLV3701IDBVR, the MAX972CUA-T uniquely balances ultra-low power (≤4µA), V−-referenced sinking, and 11V output range - making it the only option among the three capable of bipolar supply level translation without external reference or layout compromise.

Availability

MAX972CUA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and level translators requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX972CUA-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, sensing, and interface applications in industrial, medical, and communications markets.

The MAX97x/MAX98x comparator family targets ultra-low-power, single/dual-supply sensing applications - emphasizing micropower operation, wide supply range, and flexible output architecture for portable and energy-harvesting systems.

FAQ

Does the MAX972CUA-T include an internal voltage reference?

No, the MAX972CUA-T does not include an internal voltage reference. Unlike MAX971/MAX982 variants, it has no REF pin and no bandgap reference circuitry. Thresholds must be set using external resistive dividers or precision reference ICs. This design reduces quiescent current and die area, aligning with its role as a minimal-footprint comparator for externally referenced applications.

What is the correct connection for the V− pin on the MAX972CUA-T in single-supply operation?

In single-supply operation, the V− pin of the MAX972CUA-T must be connected to system ground (GND). This establishes the reference for both inputs and the output sink path. The output will then pull down to GND, and the input common-mode range becomes 0V to (V+ − 1.3V). Do not leave V− floating - it is an active supply terminal essential for proper comparator biasing.

Can the MAX972CUA-T be used with dual supplies, and what are the limits?

Yes, the MAX972CUA-T supports dual supplies from ±1.25V to ±5.5V. When using dual supplies, V+ connects to the positive rail (e.g., +5V), V− connects to the negative rail (e.g., −5V), and GND remains the substrate reference. The output sinks to V−, enabling true bipolar-to-unipolar conversion. Total supply voltage (V+ − V−) must not exceed 11V, and absolute maximum ratings require V+ ≤ (V− + 12V).

How is hysteresis implemented on the MAX972CUA-T since it lacks a HYST pin?

Hysteresis on the MAX972CUA-T must be implemented externally using positive feedback - typically a resistor from output to the noninverting input (INA+). Because the output is open-drain, a pull-up resistor is required. The hysteresis width depends on the ratio of feedback and input resistors and the output voltage swing. This method draws more current than HYST-pin devices but offers full design flexibility and avoids internal reference loading.

What is the maximum output sink current specification for the MAX972CUA-T?

The MAX972CUA-T output is rated for 1.8mA sink current at V_OL ≤ (V− + 0.4V) with V+ = 5V, and 0.8mA at V_OL ≤ (V− + 0.4V) with V+ = 3V. Sink capability scales with V+ - higher supply voltage improves drive strength. The output transistor is an NMOS with no internal current limiting; continuous short-circuit current is not specified but must be limited externally to avoid exceeding 330mW package power dissipation at +70°C.