Analog Devices Inc./Maxim Integrated MAX953EUA+

Overview

MAX953EUA+ from Maxim Integrated is a micropower single-supply analog IC integrating a unity-gain-stable operational amplifier, rail-to-rail comparator, and no internal reference in an 8-pin μMAX package. It operates from 2.4V to 7V with 5μA typical supply current, supports common-mode input down to VSS and within 1.6V of VDD, and delivers rail-to-rail outputs - enabling use in battery-powered smoke detectors and infrared receiver front ends.

For engineers reviewing the MAX953EUA+ datasheet, MAX953EUA+ pinout, MAX953EUA+ application, or MAX953EUA+ equivalent, key selection criteria include ultra-low quiescent current (5μA), absence of internal reference, unity-gain op amp stability, rail-to-rail output swing, and compatibility with high-impedance sensor interfaces requiring minimal power drain.

Technical Context

The MAX953EUA+ implements two independent analog signal paths: a CMOS-input op amp internally compensated for unity-gain stability (20kHz GBW, 12.5V/ms slew rate), and a comparator with ±3mV internal hysteresis, rail-to-rail CMOS output capable of sourcing up to 40mA, and input range extending from VSS to VDD −1.6V. Both sections share a common 2.4V–7V supply and operate across −40°C to +85°C.

No internal voltage reference is present - unlike MAX951/MAX952 - so REF pin is repurposed as COMPIN−. The comparator's inverting input connects externally, enabling flexible threshold setting. Input leakage is ≤0.05nA at +25°C, and op amp large-signal gain exceeds 40V/mV into 100kΩ load.

Key Specifications

Pinout & Package

MAX953EUA+ uses an 8-pin μMAX package (2.1mm × 2.1mm, 0.5mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin functions are validated per Maxim's official pin description table and functional diagrams.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX951EUA+, MAX953EUA+ trades internal reference for 2μA lower supply current and configurable comparator thresholds; compared with TLV2304IDR, it delivers monolithic integration, guaranteed ±3mV hysteresis, and optimized crosstalk isolation - critical for high-impedance sensor front ends.

Availability

MAX953EUA+ is available at Aetrix Electronics and suitable for battery-powered systems, smoke detectors, infrared receivers, and low-frequency RF alarms requiring stable component supply and long-term lifecycle support.

Supply support for MAX953EUA+ 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, mixed-signal, and power management ICs for industrial, medical, automotive, and communications applications.

The MAX951–MAX954 family was engineered specifically for ultra-low-power, single-supply sensor interface and alarm-triggering applications - prioritizing micropower operation, rail-to-rail performance, and integrated functionality in miniature packages.

FAQ

Does MAX953EUA+ include an internal voltage reference?

No, MAX953EUA+ does not include an internal voltage reference. Unlike MAX951EUA+ and MAX952EUA+, the REF pin on MAX953EUA+ is repurposed as COMPIN−. This allows fully external threshold configuration and eliminates reference-related supply current (2μA) and accuracy drift - making MAX953EUA+ ideal for applications requiring flexible, user-defined comparator trip points.

What is the maximum capacitive load the op amp in MAX953EUA+ can drive while remaining stable?

The op amp in MAX953EUA+ is unity-gain stable and capable of driving up to 1000pF without external compensation. This is confirmed in the datasheet under "Op Amp Capable of Driving up to 1000pF Load." Stability is maintained even under loaded conditions due to its proprietary output stage design - critical for driving long traces or filtering capacitors in sensor interfaces.

Can MAX953EUA+ operate from a 2.4V supply, and what is its performance at that voltage?

Yes, MAX953EUA+ is fully specified down to 2.4V supply voltage. At 2.4V, it maintains rail-to-rail output swing (VOL ≤ VSS + 50mV, VOH ≥ VDD − 500mV), 5μA typical supply current, and functional comparator hysteresis (±3mV). Input common-mode range remains VSS to VDD −1.6V (i.e., 0V to 0.8V), supporting ground-referenced sensor inputs in ultra-low-voltage systems.

How does the comparator hysteresis in MAX953EUA+ improve system reliability?

The comparator in MAX953EUA+ includes ±3mV internal hysteresis, which prevents output oscillation when input signals cross the threshold slowly or contain noise - such as drifting ion chamber voltages in smoke detectors. This eliminates need for external hysteresis resistors, reduces component count, and guarantees clean switching without user tuning - directly enhancing field reliability of safety-critical applications.

Is the μMAX package of MAX953EUA+ thermally enhanced, and how should it be mounted?

Yes, the MAX953EUA+ μMAX package features an exposed thermal pad. For optimal thermal performance and reliability, the pad must be soldered to a minimum 25mm² copper pour on the PCB using at least four thermal vias to inner ground planes. Improper pad connection risks junction temperature rise beyond 150°C - especially under sustained 40mA COMPOUT sourcing - potentially degrading long-term parametric stability.