Analog Devices Inc./Maxim Integrated MAX933CPA+

Overview

MAX933CPA+ from Maxim Integrated is a dual micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible outputs sourcing up to 40mA, and operation from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply). It targets battery-powered threshold detection and window monitoring where ultra-low quiescent current (<4µA over temperature) and rail-to-rail input range (V− to V+ −1.3V) are critical.

For engineers reviewing the MAX933CPA+ datasheet, MAX933CPA+ pinout, MAX933CPA+ application, or MAX933CPA+ equivalent, key selection criteria include its dual-comparator architecture with shared internal reference, HYST-pin-based hysteresis configuration, output swing from V+ to V− (requiring V− connection to ground for TTL compatibility), and commercial-temperature (0°C to +70°C) 8-pin plastic DIP packaging.

Technical Context

The MAX933CPA+ integrates two independent comparators sharing a single 1.182V ±2% reference and a dedicated HYST pin for resistor-programmable hysteresis without external feedback. Its input common-mode range extends from V− to V+ −1.3V, enabling direct sensing near supply rails in single-supply systems.

Each comparator features a glitch-free output stage that eliminates crowbar current during transitions, minimizing parasitic supply feedback and improving stability in noisy or poorly decoupled layouts. Propagation delay is 12µs at 10mV overdrive, and output drive capability includes continuous 40mA source and >5mA sink current.

Key Specifications

Pinout & Package

MAX933CPA+ uses an 8-pin plastic DIP package (0°C to +70°C operating range) with through-hole mounting and standard 0.3" wide body. Pin spacing is 0.1" (2.54mm), compatible with prototyping breadboards and wave-soldered PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX933CSA+, MAX933CPA+ offers through-hole assembly flexibility and easier manual rework, while MAX923CPA+ delivers tighter reference accuracy at identical footprint-making MAX933CPA+ optimal for cost-sensitive, non-critical threshold applications requiring DIP packaging.

Availability

MAX933CPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across industrial and embedded design cycles.

Supply support for MAX933CPA+ 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 demanding industrial, automotive, and communications applications.

The MAX931–MAX934 family was engineered for ultra-low-power sensing and detection, combining micropower comparators with integrated references to simplify battery-operated and space-constrained system designs.

FAQ

What is the operating temperature range for MAX933CPA+?

The MAX933CPA+ is specified for the commercial temperature range of 0°C to +70°C. This rating applies specifically to the plastic DIP package variant denoted by the "C" prefix in the part number. It is not rated for extended or industrial temperature operation; for −40°C to +85°C, the MAX933ESA+ (SO package) or MAX933EPA+ (DIP) should be used instead. All electrical characteristics in the datasheet for MAX933CPA+ are guaranteed within this 0°C to +70°C window.

Does MAX933CPA+ require external bypass capacitors?

MAX933CPA+ does not require mandatory power-supply bypass capacitors due to its crowbar-free output architecture, which minimizes supply rail disturbance during switching. However, a 100nF ceramic capacitor placed close to the V+ and V− pins is recommended when supply impedance is high or trace lengths exceed 2 inches. The reference output (REF pin) must never be bypassed, as doing so degrades noise performance and may cause instability per the datasheet guidance.

How is hysteresis implemented on MAX933CPA+?

Hysteresis on MAX933CPA+ is implemented using the HYST pin: connect a resistor (R1) between REF and HYST, and another (R2) between HYST and V−. The hysteresis band (VHB) ≈ 2 × (VREF − VHYST), with VHYST adjustable from REF down to REF − 50mV. For example, setting VHYST = REF − 25mV yields ~50mV hysteresis. This method avoids external feedback loops and applies identically to both comparators inside MAX933CPA+.

Can MAX933CPA+ operate from a dual supply?

Yes, MAX933CPA+ supports dual-supply operation from ±1.25V to ±5.5V. In this configuration, V+ connects to the positive rail, V− to the negative rail, and GND is left unconnected. The outputs swing from V+ to V−, and the input common-mode range remains V− to V+ −1.3V. For TTL compatibility, ensure V+ = +5V and V− = 0V (i.e., single-supply mode); dual-supply use is typical for bipolar signal monitoring such as ±5V sensor interfaces.

What is the maximum load current the REF pin can drive?

The REF pin of MAX933CPA+ is specified to source up to 15µA and sink up to 8µA while maintaining ±2% accuracy over temperature. Exceeding these limits causes reference voltage droop and increased error. For applications requiring higher reference current (e.g., driving multiple resistor dividers), an external buffer amplifier is recommended. The HYST pin draws negligible current (<20nA), so R1/R2 values can be selected independently of REF loading constraints.