Analog Devices Inc./Maxim Integrated MAX923CPA+

Overview

The MAX923CPA+ from Maxim Integrated is a dual, micro-power comparator with internal 1.182V ±1% voltage reference and programmable hysteresis via HYST pin. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤6µA quiescent current over 0°C to +70°C, and delivers TTL/CMOS-compatible outputs that source up to 40mA. It is used in battery-powered threshold detection and window comparator circuits where ultra-low power and rail-to-rail input range are critical.

For engineers reviewing the MAX923CPA+ datasheet, MAX923CPA+ pinout, MAX923CPA+ application, or MAX923CPA+ equivalent, key selection criteria include guaranteed hysteresis implementation without external feedback, dual-comparator integration in 8-pin DIP, ±1% reference accuracy over commercial temperature range, and output swing from V+ to V− enabling bipolar signal monitoring.

Technical Context

The MAX923CPA+ integrates two independent comparators sharing one internal bandgap reference and one HYST pin for simultaneous hysteresis programming on both channels. Its input common-mode range extends from V− to (V+ − 1.3V), supporting operation near ground or negative rails. The output stage eliminates crowbar current during transitions, reducing parasitic supply feedback and improving stability in noisy layouts.

Unlike MAX922 (no reference) or MAX924 (quad, no internal hysteresis), the MAX923CPA+ uniquely combines reference, dual comparators, and adjustable hysteresis in an 8-pin package. Its HYST pin accepts 0–50mV below REF to set hysteresis bands up to 100mV, with design equations provided for resistor-based configuration using only two external components.

Key Specifications

Pinout & Package

MAX923CPA+ uses an 8-pin plastic DIP package with through-hole mounting and 0.3-inch width. Pin spacing is 0.1 inch, compatible with standard prototyping and production PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX923CSA and TLV3702IDR, the MAX923CPA+ offers unique integration of reference + dual comparators + hysteresis control in a through-hole package-reducing bill-of-materials and simplifying validation for cost-sensitive, low-volume, or legacy-assembly applications.

Availability

MAX923CPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and window comparators requiring stable component supply across industrial and embedded design cycles.

Supply support for MAX923CPA+ 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, medical, and communications markets.

The MAX921–MAX924 family was engineered for ultra-low-power, single/dual-supply comparator applications where micropower operation, integrated reference, and hysteresis simplicity are essential-targeting portable instrumentation, energy harvesting, and long-life battery systems.

FAQ

What is the maximum supply voltage for MAX923CPA+ in single-supply operation?

The MAX923CPA+ 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 per Absolute Maximum Ratings. For reliable long-term operation, stay within the recommended 2.5V–11V range and observe derating curves for power dissipation above +70°C ambient.

Does MAX923CPA+ require external hysteresis components to function?

No-MAX923CPA+ includes an internal hysteresis path controlled by the HYST pin. Connecting HYST to REF disables hysteresis; applying a voltage 0–50mV below REF sets a matched hysteresis band on both comparators. External resistors are optional and used only to program the HYST voltage-no feedback loop or op-amp is needed. This distinguishes MAX923CPA+ from comparators like MAX922 that lack hysteresis capability.

Can MAX923CPA+ operate from a ±5V dual supply?

Yes-MAX923CPA+ supports dual-supply operation from ±1.25V to ±5.5V. With V+ = +5V and V− = −5V, the input common-mode range extends from −5V to +3.7V, and outputs swing fully from +5V to −5V. This enables direct comparison of bipolar signals (e.g., ±2.5V sensor outputs) without level shifting. Note that REF remains referenced to V−, so its output is −5V + 1.182V = −3.818V.

What is the output voltage swing specification for MAX923CPA+?

MAX923CPA+ outputs swing from V+ to V− under load. At I_OUT = 1.8mA (commercial temp range), V_OH ≥ V+ − 0.4V and V_OL ≤ V− + 0.4V. This rail-to-rail behavior ensures TTL/CMOS compatibility when V+ = +5V and V− = GND (V_OL ≤ 0.4V, V_OH ≥ 4.6V). Output drive remains functional even with V− = −5V, making it suitable for bipolar logic interfacing.

How does the internal reference of MAX923CPA+ differ from that of MAX921CPA+?

Both MAX923CPA+ and MAX921CPA+ feature identical 1.182V ±1% internal references over 0°C to +70°C, with same source/sink current specs (15µA/8µA typical). The key difference is functional integration: MAX923CPA+ routes REF to both comparators and the HYST pin for dual-channel hysteresis, whereas MAX921CPA+ dedicates REF to a single comparator. Electrically, the reference characteristics-including noise (100µV_RMS) and temperature drift-are indistinguishable between the two parts.