Analog Devices Inc./Maxim Integrated MAX933CSA+

Overview

The MAX933CSA+ from Maxim Integrated is a dual micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible outputs that source up to 40mA and sink ≥5mA, 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-comparator circuits 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 MAX933CSA+ datasheet, MAX933CSA+ pinout, MAX933CSA+ application, or MAX933CSA+ equivalent, this page delivers verified technical context, exact pin functions for the 8-pin Plastic DIP package, real-world use cases in undervoltage/overvoltage monitoring, and two confirmed alternative parts with documented functional and packaging differences - all grounded in Maxim's official MAX931–MAX934 family documentation.

Technical Context

The MAX933CSA+ implements two independent comparators sharing one internal 1.182V reference and a dedicated HYST pin for resistor-programmable hysteresis without external feedback. Its output stage eliminates crowbar current during transitions, suppressing supply-line parasitic feedback and enabling stable operation even with suboptimal PCB layout.

Input common-mode range extends from V− to (V+ −1.3V), supporting direct sensing of signals near ground or high-side rails. The REF pin is referenced to V− (not GND), and the HYST input accepts voltages from (REF −50mV) to REF - enabling precise hysteresis bands up to 100mV with two external resistors.

Key Specifications

Pinout & Package

MAX933CSA+ uses an 8-pin Plastic DIP package (0°C to +70°C operating range), pin-compatible with MAX932 and MAX933 variants in SO and µMAX packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX933ESA+, the MAX933CSA+ trades extended temperature rating for lower cost and through-hole assembly; compared with MAX923CSA+, it sacrifices 1% reference accuracy to achieve cost-sensitive, high-volume production targeting consumer-grade power management.

Availability

MAX933CSA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and window comparators requiring stable component supply across commercial temperature ranges and long-lifecycle designs.

Supply support for MAX933CSA+ 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 electronics.

The MAX931–MAX934 product line delivers ultra-low-power comparators with integrated references specifically for energy-constrained systems like wearables, remote sensors, and backup power supervisors - prioritizing microamp quiescent current and simplified hysteresis implementation.

FAQ

What is the maximum supply voltage for MAX933CSA+ in single-supply operation?

The MAX933CSA+ supports a single-supply voltage range of +2.5V to +11V. When operated with V− tied to GND, the absolute maximum V+ is +11V. Exceeding this risks permanent damage, as specified in the Absolute Maximum Ratings table. Operation at +11V is valid only if power dissipation remains within the 727mW limit for the 8-pin Plastic DIP package at +70°C ambient.

Does MAX933CSA+ require external bypass capacitors on its supply pins?

The MAX933CSA+ does not require power-supply bypass capacitors if the supply impedance is low. However, a 100nF ceramic capacitor placed close to the V+ and V− pins is recommended when supply leads are long or source impedance is high - this mitigates potential instability from supply-line inductance, especially during high-current output transitions. The REF pin must never be bypassed.

Can MAX933CSA+ operate from a 3V single supply?

Yes, MAX933CSA+ is fully specified for 3V single-supply operation (V+ = 3V, V− = GND). Electrical Characteristics tables confirm supply current ≤3.0µA, input offset voltage ±10mV, and propagation delay ≤14µs under these conditions. Input common-mode range extends from 0V to 1.7V, supporting direct interface with 3V-output sensors or DACs.

How is hysteresis programmed on MAX933CSA+?

Hysteresis on MAX933CSA+ is programmed using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band (VHB) ≈ 2 × (REF − VHYST), with VHYST adjustable from (REF −50mV) to REF. For example, setting VHYST = REF −25mV yields ~50mV hysteresis. No external feedback around the comparator inputs is needed.

Is MAX933CSA+ pin-compatible with MAX923CSA+?

Yes, MAX933CSA+ is explicitly stated as pin-compatible with MAX923CSA+ in Maxim's documentation. Both are 8-pin Plastic DIP dual comparators with identical pin assignments (OUTA, V−, INA+, INB−, INB+, HYST, REF, V+). The primary difference is reference accuracy: MAX933CSA+ offers ±2%, while MAX923CSA+ provides ±1% - otherwise, they share supply range, drive strength, and hysteresis architecture.