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 comparator circuits where ultra-low quiescent current (<4µA over temperature) and rail-to-rail input capability (V− to V+ −1.3V) are critical.

For engineers reviewing the MAX933CPA datasheet, MAX933CPA pinout, MAX933CPA application, or MAX933CPA equivalent, key selection considerations include its dual-comparator architecture with shared reference and hysteresis control, guaranteed 0°C to +70°C commercial temperature range, 8-pin plastic DIP package, and compatibility with low-voltage 3V/5V systems requiring stable hysteresis without external feedback networks.

Technical Context

The MAX933CPA implements two independent comparators sharing a single internal 1.182V reference and a dedicated HYST pin for adjustable hysteresis-enabling precise threshold control using only two external resistors. Its output stage eliminates crowbar current during transitions, minimizing supply-line parasitic feedback and improving stability in noisy layouts.

Input common-mode range extends from V− to V+ −1.3V, supporting operation near ground in single-supply configurations; outputs swing from V+ to V− (not GND), enabling true bipolar signal monitoring. The device draws ≤4µA supply current across temperature and maintains <±10mV input offset voltage at +25°C.

Key Specifications

Pinout & Package

MAX933CPA is housed in an 8-pin plastic DIP package (0.300" wide), compatible with through-hole prototyping and legacy PCB assembly. Pin functions are validated per Maxim's official datasheet revision 1 (19-0194).

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 identical functionality in through-hole form factor, simplifying hand-soldered development; versus MAX923CSA, it trades 1% reference accuracy for lower supply current and cost-making it ideal for cost-sensitive, battery-constrained designs where ±2% reference tolerance is sufficient.

Availability

MAX933CPA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply with long-term obsolescence management.

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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX931–MAX934 family was designed specifically for ultra-low-power sensing and monitoring applications where micropower operation, integrated reference, and robust hysteresis control are essential-targeting portable instrumentation and energy-harvesting systems.

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 is confirmed in the Ordering Information table, where "CPA" suffix denotes the plastic DIP package with 0°C to +70°C rating. It is not rated for extended or military temperature ranges.

Does MAX933CPA support single-supply operation?

Yes, MAX933CPA supports single-supply operation: connect V− pin to GND and apply +2.5V to +11V to V+. Its inputs operate from V− (GND) to V+ −1.3V, and outputs swing from V+ to V− (i.e., V+ to GND), ensuring full TTL/CMOS compatibility at +5V.

How is hysteresis implemented on MAX933CPA?

MAX933CPA uses the HYST pin to implement programmable hysteresis: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band equals twice (REF − V_HYST); with V_HYST adjustable from REF −50mV to REF, the maximum hysteresis is 100mV.

What is the maximum continuous output source current of MAX933CPA?

The MAX933CPA provides continuous output source current of up to 40mA, as stated in the Features section and verified in the Absolute Maximum Ratings table (OUT short-circuit duration is continuous at V+ ≤5.5V). This enables direct LED or relay driving without external buffers.

Is MAX933CPA pin-compatible with any higher-precision alternatives?

Yes, MAX933CPA is pin-compatible with MAX923CSA and MAX923CPA, which offer a 1% accurate reference instead of 2%. This compatibility is explicitly stated in the datasheet: "The MAX933 and MAX923 are pin-compatible." No PCB changes are required when upgrading reference precision.