Analog Devices Inc./Maxim Integrated MAX903ESA+T

Overview

MAX903ESA+T from Maxim Integrated is a high-speed, low-power quad voltage comparator with differential analog inputs and TTL-compatible outputs featuring independent latch inputs per channel. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports ±5V or single +5V analog supplies, and operates across –40°C to +85°C. It is used in high-speed A/D converters, line receivers, and PWM circuits.

For engineers reviewing the MAX903ESA+T datasheet, MAX903ESA+T pinout, MAX903ESA+T application, or MAX903ESA+T equivalent, key selection considerations include latch-enabled output hold capability, rail-to-rail input common-mode range including VEE, TTL-level timing compatibility, and dual-supply isolation between analog (VCC/VEE) and digital (VDD) domains.

Technical Context

The MAX903ESA+T integrates four independent comparators sharing a common analog supply (VCC/VEE) and digital supply (VDD), each with dedicated IN+, IN−, LATCH, and OUT terminals. Its internal architecture supports fast propagation (8ns typ) via optimized high-gain bandwidth design and includes active pull-up TTL outputs capable of driving four LS-TTL loads.

Latch functionality is synchronous and edge-triggered: driving LATCH low freezes the current output state, while returning it high restores transparency. Input common-mode range extends to VEE − 0.1V, enabling ground-sensing operation with single-supply configurations where VEE = GND.

Key Specifications

Pinout & Package

MAX903ESA+T is housed in an 8-pin SO (Small Outline) package with exposed pad (SOIC-8), footprint compatible with industry-standard 150mil width SOIC-8 land patterns. Pin 1 is marked by notch or dot; device orientation follows JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage comparator applications.

Compared with MAX903ESA+T, MAX9203ESA+ offers identical speed with reduced power and no latch support, while LM339DR trades speed and integrated TTL drive for broader supply flexibility and lower cost in non-critical timing applications.

Availability

MAX903ESA+T is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial line receiver designs, and precision PWM monitoring requiring stable component supply across extended temperature ranges.

Supply support for MAX903ESA+T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX900–MAX903 family was designed specifically for high-speed, low-power voltage discrimination in data conversion and timing-critical signal conditioning systems where propagation delay and supply isolation are paramount.

FAQ

What is the maximum allowable analog supply voltage for MAX903ESA+T?

The MAX903ESA+T supports analog supply voltage (VCC to VEE) up to +12V absolute maximum. In normal operation, VCC can range from +5V to +10V with VEE grounded for single-supply use, or ±5V for split-supply configurations. Exceeding +12V risks permanent damage per the Absolute Maximum Ratings table in the MAX903ESA+T datasheet.

Does MAX903ESA+T support single-supply operation with VEE tied to ground?

Yes, MAX903ESA+T supports true single-supply operation with VEE = GND. Its input common-mode range extends to VEE − 0.1V, enabling ground-referenced input signals, and the output remains fully functional with TTL logic levels. VCC must be +5V to +10V, and VDD remains fixed at +5V.

What is the function of the LATCH pin on MAX903ESA+T?

The LATCH pin on MAX903ESA+T controls output transparency: when driven low, it freezes the current comparator output state; when high, the output responds immediately to input changes. This enables precise event capture without CPU intervention. The MAX903ESA+T implements this per-channel, unlike the MAX901 which omits latch functionality entirely.

Can MAX903ESA+T drive standard TTL logic loads directly?

Yes, MAX903ESA+T features internally pulled-up TTL-compatible outputs capable of sourcing 1mA and sinking 8mA, meeting LS-TTL fan-out requirements (up to four 74LS loads). No external pull-up resistors are needed, simplifying PCB layout and reducing component count in digital interface stages.

Is MAX903ESA+T recommended for new designs?

No - MAX903ESA+T is Not Recommended for New Designs (NRND) per Maxim's official documentation. The fabrication process is obsolete, and Maxim recommends migration to the pin-compatible MAX9203ESA+ for new projects requiring equivalent speed with half the power consumption and modern manufacturability.