Analog Devices Inc./Maxim Integrated MAX4643EUA

Overview

MAX4643EUA from Maxim Integrated is a dual SPST analog switch IC with one normally open (NO) and one normally closed (NC) channel, operating from +1.8V to +5.5V single supply. It delivers 4Ω max on-resistance at +5V, 0.6Ω R_ON matching between channels, 1Ω R_ON flatness, <20ns switching times, and <0.35nA leakage over –40°C to +85°C - ideal for precision low-voltage signal routing in portable audio systems.

For engineers reviewing the MAX4643EUA datasheet, MAX4643EUA pinout, MAX4643EUA application, or MAX4643EUA equivalent, this page provides verified electrical specs, µMAX package details, break-before-make timing behavior, rail-to-rail analog signal handling, and validated alternative options for dual-SPST analog switch selection.

Technical Context

The MAX4643EUA integrates two independent CMOS SPST switches - one NO and one NC - sharing a common logic control architecture with separate IN1/IN2 inputs. Its internal level translators enable TTL/CMOS-compatible logic thresholds only at +5V supply, while analog operation remains functional down to +1.8V with rail-to-rail signal swing.

It features break-before-make (BBM) timing (7ns typ) between its NO and NC channels, preventing momentary shorting during state transitions. All analog terminals (NO1, NC2, COM1, COM2) are bidirectional and support ±20mA continuous current, with ESD protection diodes clamping signals to V+ and GND.

Key Specifications

Pinout & Package

MAX4643EUA is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced for low-power analog switching applications. Pin 1 is marked with a dot; pin 4 and pin 5 are internally connected to GND for improved noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG741BRMZ and TS5A23157DCUR, the MAX4643EUA uniquely combines NO/NC duality with BBM timing, sub-nA leakage over full temperature range, and guaranteed R_ON matching - making it the only option among the three qualified for fail-safe, precision-matched, low-drift analog multiplexing in industrial and medical portable designs.

Availability

MAX4643EUA is available at Aetrix Electronics and suitable for battery-operated equipment, audio and video signal routing, and low-voltage data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4643EUA 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 applications.

The MAX4643EUA belongs to Maxim's high-speed, low-voltage analog switch product line - engineered specifically for precision signal routing in space-constrained, battery-sensitive systems where leakage, matching, and timing integrity are critical.

FAQ

What is the maximum supply voltage rating for MAX4643EUA?

The MAX4643EUA has an absolute maximum supply voltage (V+) of +6V, but its specified operational range is +1.8V to +5.5V. Operation above +5.5V risks permanent damage, and electrical characteristics are only guaranteed within the +1.8V to +5.5V range per the datasheet. The MAX4643EUA must be powered within this window to ensure 4Ω R_ON, <0.35nA leakage, and BBM timing compliance.

Does MAX4643EUA support rail-to-rail analog signals?

Yes, the MAX4643EUA supports rail-to-rail analog signal operation from GND to V+, confirmed by guaranteed specifications across the full 0V to V+ range at +5V and +3V supplies. This capability is enabled by its CMOS process and internal level-shifting architecture, allowing the MAX4643EUA to pass unattenuated audio, sensor, or DAC output signals without external biasing networks.

What is the purpose of the break-before-make (BBM) feature in MAX4643EUA?

The BBM timing (7ns typical) in the MAX4643EUA ensures the NC2 channel fully disconnects before NO1 connects - eliminating momentary short-circuits between signal paths during switching. This is essential in applications like sample-and-hold or redundant power routing where unintended conduction could corrupt data or damage downstream circuitry. The MAX4643EUA implements BBM inherently via its internal gate drive sequencing, requiring no external timing control.

Can MAX4643EUA operate with a +2.5V supply?

Yes, the MAX4643EUA is fully functional at +2.5V, falling within its +1.8V to +5.5V operating range. At +2.5V, R_ON increases to ~12Ω (typ), leakage remains <0.35nA, and switching times extend to ~25ns. Logic compatibility is not guaranteed below +3V, so microcontroller GPIOs driving IN1/IN2 should use push-pull outputs or level-shifters. The MAX4643EUA maintains all core analog switching functions at +2.5V, making it viable for ultra-low-power designs.

How does the leakage current specification of MAX4643EUA impact high-impedance circuits?

The MAX4643EUA's <0.35nA max leakage over –40°C to +85°C directly limits voltage error in high-impedance nodes: for example, a 1MΩ source impedance develops only 0.35mV offset, preserving accuracy in 12-bit+ data acquisition. This leakage is dominated by ESD diode reverse currents and is well-characterized across temperature - enabling reliable hold-time calculation in sample-and-hold circuits. The MAX4643EUA's leakage performance is among the lowest in its class, critical for battery-operated precision systems.