Analog Devices Inc./Maxim Integrated MAX942ESA+

Overview

MAX942ESA+ from Maxim Integrated is a dual high-speed comparator optimized for 3V/5V single-supply systems, featuring rail-to-rail inputs, 80ns propagation delay (5mV overdrive), 350μA per comparator supply current, and CMOS/TTL-compatible push-pull outputs. It operates from 2.7V to 5.5V and is used in battery-powered threshold detection and line receiver circuits.

For engineers reviewing the MAX942ESA+ datasheet, MAX942ESA+ pinout, MAX942ESA+ application, or MAX942ESA+ equivalent, key selection considerations include input common-mode range extending beyond rails, internal hysteresis for noise immunity, output swing within 0.4V of V+ and GND, and SO-8 packaging suitable for space-constrained industrial and portable designs.

Technical Context

The MAX942ESA+ implements a bipolar process-based comparator core with rail-to-rail input stage enabling operation with inputs down to –0.2V and up to V+ + 0.2V. Its internal hysteresis eliminates external feedback components and ensures clean switching on slow-moving signals.

Each comparator features a current-driven output stage delivering VOH ≥ V+ – 0.4V at 400μA source and VOL ≤ 0.4V at 400μA sink, directly interfacing with CMOS and TTL logic without pull-up resistors. Propagation delay skew between channels is limited to 10ns, supporting matched timing in dual-channel applications.

Key Specifications

Pinout & Package

MAX942ESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and 4.9mm × 6.0mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed comparator applications.

Compared with LM393DR and TLV3502IDR, MAX942ESA+ uniquely balances 80ns speed, 350μA ultra-low power, rail-to-rail inputs, and integrated hysteresis in a single 3V/5V supply SO-8 package-making it optimal for precision, low-power, single-supply thresholding where layout area and bill-of-materials count matter.

Availability

MAX942ESA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors/discriminators, and line receivers requiring stable component supply across industrial temperature ranges.

Supply support for MAX942ESA+ 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, communications, and consumer applications.

The MAX94x family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and 3V/5V embedded systems-emphasizing rail-to-rail operation, internal hysteresis, and robust I/O fault tolerance.

FAQ

What is the operating temperature range for MAX942ESA+?

The MAX942ESA+ is rated for –40°C to +85°C ambient operation, validated across this full industrial temperature range for parameters including propagation delay, input offset voltage, and supply current. This rating is confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet, with SO-8 packaging qualified for extended thermal cycling reliability.

Does MAX942ESA+ require external pull-up resistors on its outputs?

No, MAX942ESA+ does not require external pull-up resistors. Its outputs are push-pull (not open-drain) and specified to drive VOH ≥ V+ – 0.4V and VOL ≤ 0.4V at 400μA load, ensuring direct compatibility with CMOS and TTL logic families. This eliminates external components and reduces board space in compact designs using MAX942ESA+.

Can MAX942ESA+ accept input voltages below ground or above V+?

Yes, MAX942ESA+ supports an input common-mode range from –0.2V to V+ + 0.2V, explicitly allowing inputs to extend 200mV beyond both supply rails. This capability is documented in the Electrical Characteristics table and enables direct interfacing with sensors or transducers whose output swings outside the supply domain-without level-shifting circuitry.

What is the propagation delay matching between the two comparators in MAX942ESA+?

The propagation delay skew between the two comparators in MAX942ESA+ is guaranteed to be ≤10ns across temperature and supply voltage, as specified under "Propagation Delay Skew" in the Electrical Characteristics table. This tight matching supports time-critical dual-threshold or window-detection applications where channel-to-channel timing alignment is essential for MAX942ESA+ system performance.

Is internal hysteresis present in MAX942ESA+, and how much is it?

Yes, MAX942ESA+ includes fixed internal hysteresis of approximately 3mV input-referred, derived from the difference between upper and lower trip points (VTRIP+ and VTRIP−) specified in the datasheet. This hysteresis eliminates need for external feedback resistors and ensures clean, bounce-free output transitions-even with slow-moving or noisy input signals-enhancing reliability in MAX942ESA+ threshold detection applications.