Analog Devices Inc./Maxim Integrated MAX4543EUA+

Overview

The MAX4543EUA+ from Maxim Integrated is a precision dual SPST analog switch with one normally open (NO) and one normally closed (NC) channel, designed for single-supply operation from +2.7V to +12V. 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 interfaces.

For engineers reviewing the MAX4543EUA+ datasheet, MAX4543EUA+ pinout, MAX4543EUA+ application, or MAX4543EUA+ equivalent, key selection criteria include its -40°C to +85°C industrial temperature rating, µMAX-8 package footprint, dual-channel SPST/SPDT configurability, and verified 2000V ESD protection per Method 3015.7.

Technical Context

The MAX4543EUA+ implements CMOS transmission-gate architecture with TTL/CMOS-compatible logic inputs and rail-to-rail analog signal handling (0V to V+). Its internal break-before-make timing (2ns min, 10ns max at +25°C) prevents momentary shorting during channel transitions, critical for multiplexed sensor front-ends and DAC/ADC interface protection.

It operates with ultra-low supply current (<1µA at +3.6V), supports analog signals up to ±10mA continuous per terminal, and maintains low leakage (10nA max at +85°C) across its full operating range-making it suitable for high-impedance, low-power sampling paths where signal integrity and power budget are tightly constrained.

Key Specifications

Pinout & Package

The MAX4543EUA+ is housed in an 8-pin µMAX package (3.0mm × 3.0mm, 0.8mm height), pin-compatible with industry-standard SO-8 and TDFN-8 variants. The exposed pad variant is not used in this ordering option.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4542EUA+, the MAX4543EUA+ provides complementary NO/NC functionality for flexible signal routing, while ADG1419BRMZ offers lower R_ON but sacrifices BBM safety and single-supply simplicity-making MAX4543EUA+ optimal for industrial and portable systems needing robust, self-contained switching.

Availability

The MAX4543EUA+ is available at Aetrix Electronics and suitable for battery-operated instrumentation, medical ultrasound front-ends, and industrial sensor multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4543EUA+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX4541–MAX4544 family was engineered to deliver low-leakage, low-charge-injection analog switching in compact packages for portable and high-reliability systems operating from single low-voltage rails.

FAQ

What is the maximum analog signal voltage range supported by the MAX4543EUA+?

The MAX4543EUA+ supports analog signals from 0V to V+ (i.e., rail-to-rail), with V+ rated from +2.7V to +12V. At +5V supply, the analog range is 0V to +5V; at +12V, it extends to 0V to +12V. This bidirectional capability allows use as either input or output on COM, NO, and NC pins without polarity restrictions, provided absolute maximum ratings (e.g., V+ +0.3V on analog pins) are observed.

Does the MAX4543EUA+ require external protection diodes for overvoltage tolerance?

No, the MAX4543EUA+ does not require external protection diodes under normal operation within its absolute maximum ratings. Internal ESD protection exceeds 2000V per Method 3015.7, and analog pins tolerate voltages up to V+ +0.3V. However, if analog signals may exceed V+ or dip below GND (e.g., in fault conditions), external blocking diodes (as shown in Figure 1 of the datasheet) are recommended to prevent latch-up or damage-though this reduces usable signal range by ~0.7V.

Can the MAX4543EUA+ be used as a single-pole double-throw (SPDT) switch?

Yes, the MAX4543EUA+ can function as an SPDT switch by using COM1 as the common terminal, NO1 as the normally open throw, and NC1 as the normally closed throw-controlled by a single logic input (IN1). This configuration leverages its integrated NO/NC topology and guaranteed break-before-make timing, making it suitable for applications like signal source selection where automatic default path restoration is required upon power loss or control failure.

What is the thermal performance of the MAX4543EUA+ in its µMAX-8 package?

The MAX4543EUA+ in the µMAX-8 package has a power dissipation limit of 330mW at +70°C, derating by 4.10mW/°C above that temperature. At maximum rated junction temperature (+125°C), usable power drops to ~150mW. For continuous operation, keep ambient temperature ≤+85°C and ensure adequate PCB copper area under the exposed pad (if present) - though the MAX4543EUA+ variant uses a non-exposed-pad µMAX, so thermal relief relies on trace conduction and surrounding ground planes.

How does the MAX4543EUA+ compare to the MAX323 in terms of pin compatibility and performance?

The MAX4543EUA+ is explicitly pin-compatible with the MAX323 series per the datasheet's "Pin Compatible with MAX323/MAX324/MAX325" feature. Both share the same µMAX-8 pinout and basic SPST topology, but MAX4543EUA+ improves on R_ON (60Ω vs. 100Ω max), leakage (10nA vs. 25nA at +85°C), charge injection (5pC vs. 15pC), and adds guaranteed break-before-make - making it a direct functional upgrade for legacy designs seeking higher precision and reliability.