Analog Devices Inc./Maxim Integrated MAX903ESA+

Overview

MAX903ESA+ from Maxim Integrated is a high-speed, low-power quad voltage comparator IC with differential analog inputs and TTL-compatible outputs featuring active internal pull-ups. It delivers 8ns typical propagation delay at 5mV overdrive, consumes 18mW per comparator at +5V, supports ±5V or single +5V analog supply, and includes independent TTL latch inputs for output state hold. It is used in high-speed A/D converters, line receivers, and PWM circuits.

For engineers reviewing the MAX903ESA+ datasheet, MAX903ESA+ pinout, MAX903ESA+ application, or MAX903ESA+ equivalent, key selection criteria include propagation delay consistency across channels, latch timing parameters (tpd+(D), ts, th), input common-mode range extending to VEE, TTL output drive capability (VOH ≥2.4V, VOL ≤0.4V), and dual-supply isolation between analog (VCC/VEE) and digital (VDD) domains.

Technical Context

The MAX903ESA+ implements four independent high-gain comparators with fully differential inputs referenced to VEE and VCC, each equipped with dedicated TTL-compatible latch inputs (pins 4, 5, 12, 13) that freeze output states on low assertion. Its architecture supports separate analog (±5V or +5V/VSS) and digital (+5V) supplies, enabling noise isolation in mixed-signal systems.

Propagation delay is tightly specified at 8–10ns (typ/max) for both rising and falling edges under 5mV overdrive and 15pF load, with inter-channel skew limited to ≤2ns. Input offset voltage is 1–3mV over full temperature range (-40°C to +85°C), and common-mode rejection exceeds 80µV/V across -5V to +2.75V.

Key Specifications

Pinout & Package

MAX903ESA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, compliant with JEDEC MS-012AC, body size 4.9mm × 6.0mm, lead pitch 1.27mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX903ESA+, MAX9203ESA+ offers identical speed with half the power and no latch overhead-ideal for new designs prioritizing efficiency-while LM319M/NOPB trades speed and advanced features for broader supply tolerance and lower cost in non-demanding roles.

Availability

MAX903ESA+ is available at Aetrix Electronics and suitable for high-speed data sampling, industrial line receivers, and PWM-based motor control systems requiring stable component supply and guaranteed traceability.

Supply support for MAX903ESA+ 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 computing markets.

The MAX900–MAX903 family was designed as high-speed, low-power voltage comparators targeting precision timing-critical applications such as A/D converter front-ends and digital line receivers.

FAQ

What is the operating temperature range for MAX903ESA+?

The MAX903ESA+ is rated for −40°C to +85°C operation, as confirmed by its "E" grade designation and ordering code suffix "ESA". This industrial temperature range ensures reliable performance in demanding environments such as factory automation controllers and outdoor communication equipment where ambient temperatures fluctuate widely. All electrical specifications-including propagation delay, input offset voltage, and supply current-are guaranteed across this full range.

Does MAX903ESA+ support single-supply operation?

Yes, MAX903ESA+ supports true single-supply operation with VEE tied to ground and VCC supplied at +5V to +10V. Its input common-mode range extends to VEE − 0.1V, enabling ground-referenced signal detection without level-shifting circuitry. The datasheet explicitly confirms this configuration in Figure 1A and specifies performance parameters under +5V single-supply conditions, making MAX903ESA+ suitable for portable and cost-sensitive systems.

What is the function of Pin 5 (LATCH) on MAX903ESA+?

Pin 5 on MAX903ESA+ is the TTL-compatible latch enable input for Channel A. When driven low, it freezes the output state (OUT) at its current logic level regardless of subsequent input changes; when high, the comparator operates transparently. This feature enables synchronous sampling aligned to system clocks and eliminates metastability in high-speed data acquisition. Timing parameters-including 2ns minimum setup time (ts) and 1ns hold time (th)-are specified in the MAX903ESA+ datasheet.

Can MAX903ESA+ be powered from split ±5V supplies?

Yes, MAX903ESA+ can be operated from split ±5V analog supplies: VCC = +5V, VEE = −5V, with VDD = +5V for the digital section. This configuration is documented in Figure 1C of the datasheet and provides optimal noise isolation between analog and digital domains. The absolute maximum ratings allow analog supply differential up to +12V, and electrical characteristics-including input offset and propagation delay-are validated under ±5V conditions.

Is MAX903ESA+ recommended for new designs?

No, MAX903ESA+ is Not Recommended for New Designs, as stated in the official Maxim documentation. The fabrication process used for the MAX900–MAX903 family is obsolete, and Maxim recommends the pin-compatible MAX9203ESA+ as a replacement offering identical speed with half the power dissipation and improved manufacturability. While MAX903ESA+ remains available for legacy support, new designs should evaluate MAX9203ESA+ or other modern alternatives to ensure long-term supply continuity.