Analog Devices Inc./Maxim Integrated MAX933CUA

Overview

MAX933CUA from Maxim Integrated is a dual micropower voltage comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible push-pull outputs, and ultra-low 4µA max supply current over 0°C to +70°C. It operates from single +2.5V to +11V or dual ±1.25V to ±5.5V supplies, with input common-mode range extending from V− to (V+ − 1.3V), making it ideal for battery-powered threshold detection in portable instrumentation.

For engineers reviewing the MAX933CUA datasheet, MAX933CUA pinout, MAX933CUA application, or MAX933CUA equivalent, key selection considerations include its dual-comparator architecture with independent IN+/IN− pairs per channel, internal reference accuracy and temperature drift, hysteresis implementation method (HYST pin vs. external feedback), output swing limitations (V+ to V−, not GND), and compatibility with low-voltage single-supply systems down to 2.5V.

Technical Context

The MAX933CUA implements two independent comparators sharing a single internal 1.182V reference and one HYST pin for simultaneous hysteresis programming across both channels. Its output stage continuously sources up to 40mA and sinks >5mA without crowbar current, eliminating supply glitches during transitions and reducing layout sensitivity to parasitic feedback.

Input offset voltage is ±10mV (max), input leakage is ±0.01nA (typ) on IN+/IN−, and propagation delay is 12µs (typ) at 10mV overdrive. The HYST pin accepts voltages from (REF − 50mV) to REF, enabling precise hysteresis bands up to 100mV via two external resistors - a feature absent in the MAX934 and distinct from the MAX931/MAX932's single-channel implementation.

Key Specifications

Pinout & Package

MAX933CUA is housed in an 8-pin SO (Small Outline) package, 150 mil width, with gull-wing leads and JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX933CUA, MAX933CSA offers identical functionality in through-hole format for ease of hand-assembly, while MAX923CSA trades ultra-low power for tighter reference accuracy - enabling higher-precision thresholding where 1% absolute error is critical and 1.2µA extra quiescent current is acceptable.

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 long-term lifecycle support.

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, with emphasis on low-power, high-reliability solutions for industrial and portable markets.

The MAX931–MAX934 family was engineered specifically for micropower, single-supply sensing applications where integrated reference and hysteresis reduce external components - targeting battery-operated instrumentation, safety monitors, and energy-harvesting systems.

FAQ

What is the maximum operating supply voltage for MAX933CUA?

The MAX933CUA supports a single-supply range of +2.5V to +11V or dual supplies from ±1.25V to ±5.5V. Absolute maximum ratings specify V+ to V− ≤ +12V, so applying +11V on V+ with V− at GND is within specification. Exceeding +11V risks parametric degradation or damage, especially under temperature extremes.

Can MAX933CUA operate from a 3V single supply?

Yes, MAX933CUA is fully specified at 3V operation: supply current is 2.4µA (typ), input common-mode range extends to V− to (V+ − 1.3V) = 0V to 1.7V, and output swing remains functional. Reference output holds 1.182V ±2%, enabling accurate low-voltage threshold detection without level shifting.

How is hysteresis implemented on MAX933CUA?

MAX933CUA uses a dedicated HYST pin (Pin 6) connected between REF and V− via two resistors. This configures identical hysteresis on both comparators simultaneously. The hysteresis band equals twice the voltage difference between REF and HYST, with a maximum of 100mV achievable when HYST = REF − 50mV.

Does MAX933CUA have rail-to-rail input capability?

MAX933CUA input common-mode range spans V− to (V+ − 1.3V), not full rail-to-rail. At +5V supply, inputs function from 0V to +3.7V. Inputs may tolerate up to 300mV beyond rails without damage, but guaranteed operation is limited to the specified range - critical for accurate low-threshold detection.

What is the output voltage swing of MAX933CUA?

MAX933CUA outputs swing from V+ to V−, not V+ to GND. With V− tied to GND, OUTA/OUTB swing from V+ to 0V - compatible with TTL/CMOS loads. If V− is negative (e.g., −5V), outputs swing from V+ to that negative rail. This differs from MAX931/MAX934, which swing to GND.