Analog Devices Inc./Maxim Integrated MAX4743EUA+

Overview

MAX4743EUA+ from Maxim Integrated is a dual single-pole/single-throw (SPST) analog switch with one normally open (NO) and one normally closed (NC) channel, designed for low-voltage signal routing in battery-powered systems. It operates from a single +1.6V to +3.6V supply, delivers 0.8Ω max on-resistance at +3V, supports rail-to-rail analog signals, and features break-before-make switching with 6ns typical t_BBM. It is used in cellular phone audio paths and PCMCIA card interface switching.

For engineers reviewing the MAX4743EUA+ datasheet, MAX4743EUA+ pinout, MAX4743EUA+ application, or MAX4743EUA+ equivalent, key selection criteria include verified break-before-make timing, 150mA continuous current handling, 1.8V CMOS logic compatibility at +3V supply, and µMAX package thermal performance under industrial temperature range (-40°C to +85°C).

Technical Context

The MAX4743EUA+ implements CMOS transmission-gate architecture enabling bidirectional rail-to-rail analog signal switching across both channels. Its break-before-make behavior is guaranteed by design (t_BBM = 6ns typ), preventing momentary short-circuit during channel transition - critical for power routing and audio multiplexing where signal integrity must be preserved.

Each channel independently supports 150mA continuous current and exhibits matched on-resistance (ΔR_ON ≤ 0.09Ω) and flatness (R_FLAT(ON) ≤ 0.20Ω) over the full analog input range, ensuring minimal gain error and THD of 0.02% at 20Hz–20kHz in 32Ω loads.

Key Specifications

Pinout & Package

The MAX4743EUA+ is housed in an 8-pin µMAX package (U8-1), measuring 3.05mm × 3.05mm × 1.05mm, with exposed pad for thermal enhancement and rated for 362mW power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4742EUA+, MAX4743EUA+ adds functional asymmetry (NO+NC) essential for power sequencing; versus TMUX1574RSVR, it trades 0.3Ω lower R_ON for guaranteed t_BBM and proven industrial temperature reliability in µMAX packaging.

Availability

MAX4743EUA+ is available at Aetrix Electronics and suitable for cellular phone audio routing, PCMCIA interface design, and low-voltage data-acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX4743EUA+ 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 industrial, communications, and consumer applications.

The MAX474x family targets low-voltage analog signal routing in space-constrained portable electronics, emphasizing low R_ON, rail-to-rail operation, and guaranteed break-before-make timing for safe power and audio path control.

FAQ

What is the maximum continuous current rating for MAX4743EUA+?

The MAX4743EUA+ supports 150mA continuous current per channel (COM_, NO_, or NC_ terminals) across the full -40°C to +85°C operating range. This rating is validated per Absolute Maximum Ratings and confirmed in Electrical Characteristics tables. Exceeding this current may cause thermal stress or parametric shift. The MAX4743EUA+ datasheet specifies peak pulsed current up to ±300mA at 1ms/10% duty cycle, but sustained operation must remain within the 150mA limit for reliability.

Does MAX4743EUA+ support rail-to-rail analog signal switching?

Yes, the MAX4743EUA+ supports rail-to-rail analog signal switching from GND to V+ across both channels. This is enabled by its CMOS transmission-gate architecture and confirmed in the "Analog Signal Range" parameter (V_{COM_}, V_{NO_}, V_{NC_} = 0 to V+). At +3V supply, on-resistance flatness remains ≤0.20Ω over the full 0–3V range, ensuring minimal distortion. The MAX4743EUA+ maintains this capability down to +1.6V supply, making it suitable for Li-ion and single-cell battery systems.

What is the logic voltage compatibility of MAX4743EUA+ inputs?

The MAX4743EUA+ logic inputs (IN1, IN2) are 1.8V CMOS compatible when operated from a +3V supply, with VIH = +1.4V min and VIL = +0.5V max. Critically, inputs tolerate voltages up to +3.6V regardless of supply - meaning IN1/IN2 can be driven rail-to-rail (0V to V+) even at +1.8V V+, simplifying interface with mixed-voltage controllers. Input leakage remains ≤±1µA across temperature, minimizing loading on driving circuitry.

How is break-before-make timing specified for MAX4743EUA+?

Break-before-make timing for MAX4743EUA+ is specified as t_BBM = 6ns typical (1ns min, 10ns max) at +3V supply, measured per Figure 1 test circuit with RL = 50Ω and CL = 35pF. This parameter is guaranteed by design (Note 6) and applies exclusively to the MAX4743 variant - MAX4741 and MAX4742 do not feature break-before-make. The MAX4743EUA+ achieves this via internal timing control that delays turn-on of the second switch until the first is fully off, preventing momentary shorts in power routing applications.

What package type and dimensions does MAX4743EUA+ use?

The MAX4743EUA+ uses the 8-pin µMAX package (package code U8-1), with body dimensions of 3.05mm × 3.05mm × 1.05mm and an exposed thermal pad. It is footprint-compatible with industry-standard µSOP-8 and offers 362mW power dissipation at +70°C ambient (derated 4.5mW/°C above). Pin 1 is marked by a dot; the package drawing is documented in Maxim's 21-0036 outline. This compact, thermally enhanced package supports high-density layouts in smartphones and portable instrumentation where board space is constrained.