Analog Devices Inc./Maxim Integrated MAX933CUA+

Overview

The MAX933CUA+ from Maxim Integrated is a dual micropower voltage comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, and rail-to-rail input operation down to V− and within 1.3V of V+. It draws ≤4µA supply current over 0°C to +70°C, supports single-supply operation from +2.5V to +11V, and delivers TTL/CMOS-compatible outputs that source up to 40mA and sink ≥5mA - ideal for battery-powered threshold detection and window comparator circuits.

For engineers reviewing the MAX933CUA+ datasheet, MAX933CUA+ pinout, MAX933CUA+ application, or MAX933CUA+ equivalent, key selection considerations include its dual-comparator architecture with shared reference and hysteresis control, ultra-low quiescent current across temperature, output swing from V+ to V− (requiring V− connection to GND for single-supply TTL compatibility), and µMAX-8 package suitability for space-constrained portable systems.

Technical Context

The MAX933CUA+ implements two independent comparators sharing one internal 1.182V reference and one HYST terminal for simultaneous hysteresis programming. Its input common-mode range extends from V− to (V+ − 1.3V), enabling direct sensing near ground in single-supply configurations. The output stage eliminates crowbar current during transitions, minimizing supply-induced parasitic feedback.

Unlike standard comparators, the MAX933CUA+ features continuous 40mA source capability and no switching crowbar current - critical for driving LEDs or logic loads without external buffers. Hysteresis is set by two resistors between REF and HYST (and HYST to V−), delivering a maximum 100mV hysteresis band without feedback networks or complex calculations.

Key Specifications

Pinout & Package

MAX933CUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), optimized for high-density portable PCB layouts. Pin assignments are validated per Maxim's official datasheet revision 1 (19-0194) and functional diagrams.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX923CUA+, MAX933CUA+ trades 1% reference accuracy for lower cost and sufficient precision for battery cutoff or power-good monitoring; versus TLV3702IDR, it integrates the reference and hysteresis control but consumes slightly more supply current - making it superior for self-contained, minimal-footprint threshold detection.

Availability

MAX933CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with guaranteed commercial-temperature performance and µMAX packaging.

Supply support for MAX933CUA+ 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 consumer markets.

The MAX931–MAX934 family targets ultra-low-power sensing and monitoring, delivering micropower comparators with integrated references to replace discrete reference + comparator solutions in portable and energy-harvesting systems.

FAQ

What is the operating temperature range for the MAX933CUA+?

The MAX933CUA+ is specified for the commercial temperature range of 0°C to +70°C. This is confirmed in the Ordering Information table, which lists MAX933CUA (no suffix) as the 0°C to +70°C variant in µMAX-8 package. It is not rated for extended or industrial temperature ranges.

Does the MAX933CUA+ require external components to operate as a basic comparator?

The MAX933CUA+ can function as a basic dual comparator with only V+, V−, and load connections - no external components are required for core comparison. However, to use the internal reference or add hysteresis, external resistors connected to REF and HYST pins are necessary. The HYST pin must be tied to REF if hysteresis is not needed.

How does the MAX933CUA+ achieve 40mA output source current while maintaining 4µA quiescent current?

The MAX933CUA+ uses a unique output stage architecture that separates bias current paths: quiescent current flows only through the comparator core and reference, while the 40mA source capability activates only during output transitions or loading. This design decouples static power from dynamic drive strength, enabling micropower operation alongside robust output drive.

Can the MAX933CUA+ be used with a single +3.3V supply?

Yes, the MAX933CUA+ operates from a single +2.5V to +11V supply, fully supporting +3.3V operation. At 3.3V, supply current remains ≤4µA, input common-mode range covers 0V to 2.0V, and output swings from 3.3V to V− (GND), delivering valid logic-high and logic-low levels compatible with 3.3V CMOS interfaces.

Is the MAX933CUA+ pin-compatible with any higher-accuracy alternatives?

Yes, the MAX933CUA+ is pin-compatible with the MAX923CUA+, which offers identical pinout, package, and dual-comparator functionality but with a 1% accurate reference instead of 2%. This allows drop-in replacement where tighter reference tolerance is required, without PCB or layout changes.