Analog Devices Inc./Maxim Integrated MAX4543ESA+

Overview

MAX4543ESA+ from Maxim Integrated is a precision dual SPST analog switch with one normally open (NO) and one normally closed (NC) channel, designed for single +2.7V to +12V supply operation. It delivers 60Ω max on-resistance, 2Ω max R_ON matching between channels, 5pC max charge injection, and guaranteed break-before-make switching - enabling reliable signal routing in battery-powered instrumentation and mixed-signal front-ends.

For engineers reviewing the MAX4543ESA+ datasheet, MAX4543ESA+ pinout, MAX4543ESA+ application, or MAX4543ESA+ equivalent, key selection considerations include its SO-8 package compatibility, -40°C to +85°C industrial temperature range, TTL/CMOS logic interface, and verified performance in sample-and-hold circuits and audio/video multiplexing where low leakage (<10nA at +85°C) and fast switching (t_ON = 35ns typ) are critical.

Technical Context

The MAX4543ESA+ implements two independent CMOS transmission gates in a single SO-8 package, each controlled by separate digital inputs (IN1, IN2), supporting true bidirectional analog signal flow across COM/NO/NC terminals. Its internal architecture guarantees break-before-make timing (t_D = 2–10ns) exclusively for the NO/NC pair, preventing momentary short-circuit during state transitions.

It operates from a single supply without requiring dual rails or level-shifting circuitry, accepts rail-to-rail analog signals (0V to V+), and maintains low R_ON flatness (6Ω max) and tight channel matching (2Ω max ΔR_ON) over the full signal range and temperature - essential for precision gain-setting and calibration paths.

Key Specifications

Pinout & Package

MAX4543ESA+ is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPST analog switch applications.

Compared with MAX4543EKA-T, the MAX4543ESA+ offers identical switching performance in a standard SO-8 footprint ideal for through-hole prototyping and legacy layout reuse; versus ADG1419BRUZ, it provides dual independent SPST topology with break-before-make on a single supply - better matching for differential channel routing and lower system BOM count.

Availability

MAX4543ESA+ is available at Aetrix Electronics and suitable for battery-operated systems, sample-and-hold circuits, and audio/video switching requiring stable component supply across industrial temperature grades.

Supply support for MAX4543ESA+ 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 consumer markets.

The MAX4541–MAX4544 family was engineered for low-voltage, single-supply analog signal routing in portable and precision instrumentation - emphasizing low leakage, fast switching, and rail-to-rail operation without external support components.

FAQ

What is the maximum supply voltage rating for MAX4543ESA+?

The MAX4543ESA+ has an absolute maximum supply voltage (V+) of +13V, with recommended operating range from +2.7V to +12V. Exceeding +13V risks permanent damage. At +12V operation, analog signals may swing rail-to-rail (0V to +12V), and logic inputs remain fully compatible without level shifting - a key advantage for wide-supply-range systems using the MAX4543ESA+.

Does MAX4543ESA+ support break-before-make switching, and how is it implemented?

Yes, MAX4543ESA+ guarantees break-before-make timing exclusively between its NO and NC terminals on each channel, with t_D = 2–10ns. This is achieved via internal timing control circuitry that delays NO closure until NC is fully opened - critical for SPDT emulation without signal shorting. The feature is inherent to the MAX4543ESA+ silicon design and requires no external components or configuration.

What is the typical on-resistance flatness of MAX4543ESA+, and why does it matter?

The MAX4543ESA+ specifies 6Ω max R_ON flatness - meaning its on-resistance varies by ≤6Ω across the full 0V to V+ analog signal range. This tight flatness ensures consistent gain, minimal THD, and predictable settling in precision applications like programmable-gain amplifiers and calibrated sensor interfaces where the MAX4543ESA+ serves as a low-drift signal path selector.

Can MAX4543ESA+ be used with a +3.3V supply, and what performance changes occur?

Yes, MAX4543ESA+ operates fully specified from +3.0V to +3.6V. At +3.3V, R_ON increases to 125Ω max (vs. 60Ω at +5V), t_ON/t_OFF slow to 400ns/175ns max, and leakage remains ≤10nA at +85°C. Logic inputs retain rail-to-rail compatibility. These trade-offs are documented in the +3.3V Electrical Characteristics table - confirming the MAX4543ESA+ remains functional and reliable in modern low-voltage systems.

Is MAX4543ESA+ pin-compatible with older Maxim analog switches?

Yes, MAX4543ESA+ is pin-compatible with MAX323, MAX324, and MAX325 in the SO-8 package, sharing identical pin functions and layout. This allows direct replacement in existing designs without PCB modification. However, the MAX4543ESA+ improves upon those predecessors with lower leakage (10nA vs. 25nA), tighter R_ON matching (2Ω vs. 5Ω), and guaranteed break-before-make - making it a validated upgrade path for the MAX4543ESA+.