Analog Devices Inc./Maxim Integrated MAX972ESA+T

Overview

The MAX972ESA+T from Maxim Integrated is a single, ultra-low-power, open-drain comparator with no internal voltage reference and no programmable hysteresis. It operates from a single 2.5V to 11V supply (or ±1.25V to ±5.5V dual supplies), draws ≤4µA quiescent current over temperature, supports rail-to-rail input common-mode range down to V− and within 1.3V of V+, and features an open-drain output sinking to V−-ideal for battery-powered threshold detection in portable instrumentation.

For engineers reviewing the MAX972ESA+T datasheet, MAX972ESA+T pinout, MAX972ESA+T application, or MAX972ESA+T equivalent, key selection criteria include its 4µA max supply current at +85°C, absence of internal reference (requiring external biasing), UCSP-8 or SO-8 package compatibility, and use of V− as output sink reference rather than GND-critical for bipolar-to-single-ended level translation.

Technical Context

The MAX972ESA+T implements a micropower comparator core without integrated bandgap reference or HYST pin functionality-distinguishing it from MAX971/MAX982 variants. Its input stage accepts voltages from V− to (V+ − 1.3V), enabling operation near supply rails in low-voltage systems.

Output behavior is defined by an N-channel open-drain transistor sinking to V−, not GND; this allows direct interfacing with negative rails or floating grounds. Propagation delay is 12µs (typical, 10mV overdrive) and output leakage remains ≤100nA at 11V, supporting high-impedance pull-up configurations in power-sensitive designs.

Key Specifications

Pinout & Package

MAX972ESA+T is supplied in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, body size 4.9mm × 6.0mm × 1.75mm, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX971ESA+, the MAX972ESA+T saves ~1.5µA by omitting the reference, trading hysteresis convenience for design flexibility; versus TLV3701IDBVR, it enables true bipolar-level translation but consumes higher quiescent current.

Availability

MAX972ESA+T is available at Aetrix Electronics and suitable for battery-powered systems, industrial sensor interfaces, and portable medical devices requiring stable component supply with guaranteed −40°C to +85°C operation and long-term obsolescence management.

Supply support for MAX972ESA+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, automotive, and communications markets.

The MAX97x/MAX98x comparator family targets ultra-low-power, rail-to-rail sensing in space- and energy-constrained systems-emphasizing micropower operation, wide supply range, and flexible output architecture over speed or integration.

FAQ

What is the maximum supply voltage for MAX972ESA+T?

The MAX972ESA+T supports a total supply voltage up to 11V in single-supply mode (V+ to V−), or ±5.5V in dual-supply mode. Absolute maximum ratings specify V+ to V− of −0.3V to +12V, but functional operation is guaranteed only within 2.5V to 11V. Exceeding 11V risks parametric degradation or reliability impact.

Does MAX972ESA+T include an internal voltage reference?

No, the MAX972ESA+T does not include an internal voltage reference. Unlike MAX971/MAX982 variants, its REF pin is unconnected and must remain floating or grounded per layout guidance. Users must provide an external reference for threshold comparison, preserving design flexibility and minimizing quiescent current.

How is the output of MAX972ESA+T configured, and what is its sink capability?

The MAX972ESA+T features an open-drain output (OUTA) that sinks current to V−, not GND. At V+ = 5V and V− = 0V, it delivers 1.8mA sink current with ≤0.4V low-level voltage. When V− = −5V, the same output sinks to −5V, enabling direct level translation between bipolar and single-ended domains without added components.

Can MAX972ESA+T operate with input voltages below the negative supply rail?

Yes, the MAX972ESA+T inputs tolerate voltages from (V− − 0.3V) to (V+ + 0.3V) without damage. However, guaranteed functional input common-mode range is strictly V− to (V+ − 1.3V). Operation outside this range may cause increased offset, reduced CMRR, or undefined output states - verify performance empirically if extended rail operation is required.

What package options are available for MAX972ESA+T, and is the SO-8 pinout compatible with other MAX97x devices?

MAX972ESA+T is offered exclusively in the 8-pin SO (SOIC-N) package (suffix "ESA"). Its pinout matches the MAX971/MAX982 SO-8 variants for pins 1–4 and 7–8, but pins 5 (HYST) and 6 (REF) are unconnected - unlike MAX971ESA+ where those pins are functional. PCB layouts must isolate or float pins 5 and 6 to avoid unintended biasing.