Analog Devices Inc./Maxim Integrated MAX4730ELT+T

Overview

MAX4730ELT+T from Maxim Integrated is a low-voltage, single-pole/double-throw (SPDT) CMOS analog switch in a 6-pin µDFN package, featuring 3.5Ω on-resistance at +2.7V, 0.45Ω R_ON flatness, and 1nA supply current. It operates from +1.8V to +5.5V and delivers 300MHz -3dB bandwidth with 19.5pF on-capacitance - ideal for audio signal routing in portable battery-powered devices.

For engineers reviewing the MAX4730ELT+T datasheet, MAX4730ELT+T pinout, MAX4730ELT+T application, or MAX4730ELT+T equivalent, key selection criteria include its SPDT topology, µDFN footprint compatibility, low-leakage performance across -40°C to +85°C, and TTL/CMOS logic interface with overvoltage-tolerant IN pin up to +5.5V independent of V+.

Technical Context

The MAX4730ELT+T implements a fully integrated CMOS transmission-gate architecture optimized for low-distortion analog switching. Its break-before-make timing (1ns typical) prevents signal shorting during state transitions, while charge injection is tightly controlled at 3pC - critical for precision sample-and-hold circuits.

It supports rail-to-rail analog signal handling (0V to V+) with matched channel performance: 0.37Ω R_ON match and <6.5pF off-capacitance ensure minimal crosstalk (-52dB at 10MHz) and high off-isolation (-67dB at 1MHz), enabling clean multiplexing in communications and data-acquisition systems.

Key Specifications

Pinout & Package

MAX4730ELT+T is housed in a 1.5mm × 1.0mm, 0.5mm pitch, 6-pin µDFN package (package code L611+1) with wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4729ELT+T and TMUX1574YFPR, the MAX4730ELT+T offers optimal balance of minimal µDFN footprint, inverted logic mapping for fail-safe open-circuit defaults, and lowest R_ON flatness - making it preferred for space-constrained, low-distortion portable designs requiring deterministic power-on state.

Availability

MAX4730ELT+T is available at Aetrix Electronics and suitable for battery-operated equipment, audio/video signal routing, and low-voltage data-acquisition systems requiring stable component supply and long-term manufacturability.

Supply support for MAX4730ELT+T 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 MAX4729/MAX4730 family was designed specifically for ultra-low-power, high-fidelity analog signal switching in portable and space-constrained systems - emphasizing rail-to-rail operation, minimal distortion, and robust temperature performance.

FAQ

What is the maximum analog signal voltage range supported by the MAX4730ELT+T?

The MAX4730ELT+T supports analog signals from 0V to V+, where V+ ranges from +1.8V to +5.5V. This rail-to-rail capability allows full utilization of the supply voltage for signal swing - critical for maximizing dynamic range in low-voltage audio and sensor interfaces. Absolute maximum analog pin voltage is V+ +0.3V, enforced by internal clamping diodes.

Does the MAX4730ELT+T require external pull-up or pull-down resistors on the IN pin?

No, the MAX4730ELT+T does not require external biasing on the IN pin. Its TTL/CMOS-compatible inputs have defined thresholds (VIH ≥ 2.0V, VIL ≤ 0.4V) and consume only 1µA max input leakage. The device operates reliably with direct connection to microcontroller GPIOs or FPGA outputs - even when V+ = 1.8V and logic high is 3.3V, thanks to overvoltage tolerance up to +5.5V.

How does the MAX4730ELT+T differ from the MAX4729ELT+T in functional behavior?

The MAX4730ELT+T and MAX4729ELT+T share identical electrical specs and packaging but differ in logic polarity: for MAX4730ELT+T, IN = HIGH connects COM to NO and IN = LOW connects COM to NC; MAX4729ELT+T uses the opposite mapping. This inversion affects power-on default state and firmware logic - no hardware changes are needed beyond updating control signal polarity.

Can the MAX4730ELT+T be used in bidirectional signal paths?

Yes, the MAX4730ELT+T is fully bidirectional - COM, NO, and NC terminals support signal flow in either direction without performance degradation. Its symmetric R_ON, matched capacitance (<19.5pF on, <6.5pF off), and low THD make it suitable for I²S, USB audio, and other bidirectional analog interfaces where signal integrity must be preserved regardless of direction.

What thermal derating applies to the MAX4730ELT+T in its µDFN package?

The MAX4730ELT+T in the 6-pin µDFN package has a continuous power dissipation limit of 168mW at TA = +70°C, derating linearly by 2.1mW/°C above that temperature. At +85°C ambient, maximum allowable power drops to 134.5mW. This reflects its 1.5mm × 1.0mm footprint and thermal resistance (θ_JA ≈ 71°C/W), requiring minimal copper pour for most low-duty-cycle switching applications.