Analog Devices Inc./Maxim Integrated MAX942EUA

Overview

MAX942EUA from Maxim Integrated is a dual high-speed rail-to-rail input comparator optimized for 3V/5V single-supply systems, featuring 80ns propagation delay, 350μA per comparator supply current, and rail-to-rail input voltage range extending beyond both supply rails. It interfaces directly with CMOS/TTL logic in battery-powered threshold detection and line receiver applications.

For engineers reviewing the MAX942EUA datasheet, MAX942EUA pinout, MAX942EUA application, or MAX942EUA equivalent, key selection considerations include propagation delay vs. overdrive, input offset voltage across temperature, output swing capability without external pullups, and μMAX package thermal performance in compact portable designs.

Technical Context

The MAX942EUA implements a bipolar process-based comparator core with internal hysteresis (1mV typical input-referred), enabling clean switching with slow-moving inputs without external components. Its rail-to-rail input stage supports common-mode voltages from –0.2V to V+ + 0.2V, and its current-driven output stage delivers VOH = V+ – 0.2V (at 400μA) and VOL = 0.2V (at 400μA).

As a dual-channel device, it guarantees matched propagation delay skew ≤10ns between channels and differential propagation delay ≤10ns. The device operates from 2.7V to 5.5V, with guaranteed performance over –40°C to +85°C and absolute maximum supply voltage of +6.5V.

Key Specifications

Pinout & Package

The MAX942EUA is housed in an 8-pin μMAX® package (U8-1 outline), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. This thermally efficient, space-constrained package supports high-density portable PCB layouts.

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, the MAX942EUA uniquely balances 80ns speed, 350μA ultra-low power, and true rail-to-rail input operation in a miniature μMAX package - making it optimal for space- and energy-constrained 3V/5V portable instrumentation.

Availability

MAX942EUA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and line receivers requiring stable component supply across industrial temperature ranges and high-volume production cycles.

Supply support for MAX942EUA 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 battery-operated equipment where rail-to-rail input range and minimal quiescent current are critical.

FAQ

What is the operating supply voltage range for the MAX942EUA?

The MAX942EUA operates from 2.7V to 5.5V DC on its V+ pin, with guaranteed performance across the full –40°C to +85°C temperature range. Absolute maximum rating is +6.5V, but operation above 5.5V voids parametric guarantees. At 2.7V, propagation delay increases to 150ns (max), and output swing degrades slightly - design margins should account for this in low-voltage 3V systems.

Does the MAX942EUA have internal hysteresis, and how does it affect circuit design?

Yes, the MAX942EUA includes fixed internal hysteresis (~1mV input-referred), eliminating the need for external hysteresis resistors. This simplifies PCB layout and improves repeatability in threshold detection. Unlike adjustable hysteresis schemes, the MAX942EUA's fixed value prevents oscillation on slow-moving inputs but limits fine trip-point tuning - users requiring variable hysteresis must add external positive feedback.

Can the MAX942EUA outputs drive TTL and CMOS logic directly?

Yes, the MAX942EUA outputs are fully compatible with both TTL and CMOS logic families. At 400μA sink/source current, VOH reaches V+ – 0.2V and VOL stays at 0.2V, satisfying VIH(min) = 2.0V and VIL(max) = 0.8V for standard 5V TTL and VIH(min) = 70% VDD for CMOS. No external pullup resistors are required, reducing component count and board area.

What is the pin-compatible alternative to the MAX942EUA in the same μMAX package?

No pin-compatible drop-in replacement exists for the MAX942EUA in the 8-pin μMAX package. The MAX942ESA (SO-8) and MAX942EPA (PDIP-8) share identical functionality and pinout but differ in package. For redesigns, TLV3502IDR uses SO-8 and offers superior speed but higher current; it is not pin-compatible and requires layout changes due to different pin assignments and thermal pad requirements.

How does the MAX942EUA handle input overvoltage conditions?

The MAX942EUA input stage includes back-to-back diodes and 4.1kΩ series resistors, allowing continuous operation with inputs up to 0.3V beyond either supply rail (–0.3V to V+ + 0.3V). Differential input voltage is clamped to ~1.4V. During overvoltage, input bias current rises - up to 20mA fault current is tolerated without damage. This enables robust interfacing with unregulated or mismatched signal sources without external protection.