Analog Devices Inc./Maxim Integrated MAX4730EXT+T

Overview

MAX4730EXT+T from Maxim Integrated is a low-voltage, single-pole/double-throw (SPDT) CMOS analog switch with 3.5Ω on-resistance at +2.7V supply, 0.45Ω R_ON flatness, and 1nA supply current. It operates from +1.8V to +5.5V, supports -40°C to +85°C, and is used in audio signal routing and battery-powered data-acquisition systems.

For engineers reviewing the MAX4730EXT+T datasheet, MAX4730EXT+T pinout, MAX4730EXT+T application, or MAX4730EXT+T equivalent, key selection criteria include on-resistance matching (0.37Ω max ΔR_ON), 300MHz -3dB bandwidth, low charge injection (3pC), and SC70 package compatibility for space-constrained portable designs.

Technical Context

The MAX4730EXT+T implements a CMOS transmission-gate architecture optimized for low-voltage operation, with TTL/CMOS-compatible logic inputs tolerant up to +5.5V regardless of V+ level. Its break-before-make timing (1ns typical) prevents signal shorting during switching transitions.

It features matched channel performance (ΔR_ON ≤ 0.37Ω over temperature), low off-isolation (-45dB at 10MHz), and minimal crosstalk (-52dB at 10MHz), enabling high-fidelity analog multiplexing in precision signal chains without external level-shifting.

Key Specifications

Pinout & Package

MAX4730EXT+T is housed in a RoHS-compliant 6-pin SC70 package (outline 21-0077), footprint code X6SN+1, measuring 2.0mm × 1.25mm × 0.95mm. Pin 1 is marked with a dot; device orientation follows standard SC70 top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4729EXT+T and TMUX1574DCKR, the MAX4730EXT+T provides the best combination of low R_ON flatness (0.45Ω), ultra-low leakage (±3nA), and high bandwidth (300MHz) in the SC70 form factor-making it ideal for portable audio and precision sensing where signal integrity and power efficiency are co-critical.

Availability

MAX4730EXT+T is available at Aetrix Electronics and suitable for battery-operated equipment, audio signal routing, and low-voltage data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4730EXT+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, designs precision analog, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.

The MAX4729/MAX4730 family targets low-power, high-fidelity analog signal routing in portable and space-constrained systems-emphasizing rail-to-rail operation, minimal distortion, and robust thermal performance from -40°C to +85°C.

FAQ

What is the maximum analog signal voltage range supported by the MAX4730EXT+T?

The MAX4730EXT+T supports an analog signal range from 0V to V+, where V+ can be set between +1.8V and +5.5V. For example, with V+ = +3.3V, the COM, NO, and NC terminals handle signals from 0V to +3.3V. Signals exceeding V+ or going below GND are clamped by internal diodes, so external protection is recommended if overvoltage conditions are possible. This rail-to-rail capability makes the MAX4730EXT+T suitable for direct interfacing with sensors and audio codecs without level-shifting circuitry.

Does the MAX4730EXT+T require external pull-up or pull-down resistors on the IN pin?

No, the MAX4730EXT+T does not require external pull-up or pull-down resistors on the IN pin. Its digital input is TTL/CMOS-compatible with guaranteed VIH ≥ +2.0V and VIL ≤ +0.4V over the full -40°C to +85°C range, and it draws only ±1µA input leakage current. The internal structure provides sufficient noise immunity and threshold stability, allowing direct connection to microcontroller GPIOs or FPGA outputs. This simplifies PCB layout and reduces BOM count compared to switches needing external biasing.

Can the MAX4730EXT+T be used in bidirectional signal paths?

Yes, the MAX4730EXT+T supports fully bidirectional analog signal flow between COM and either NO or NC. Its CMOS transmission-gate design imposes no inherent directionality-the switch conducts equally well in either direction when ON, with symmetric R_ON, capacitance, and leakage characteristics. This enables flexible use in I²C bus isolation, audio loopback paths, and sensor excitation/readback configurations where signal direction may reverse dynamically. No special sequencing or polarity considerations apply.

What is the thermal performance of the MAX4730EXT+T in the SC70 package?

The MAX4730EXT+T in the SC70 package has a power dissipation limit of 245mW at +70°C ambient, derating linearly by 3.1mW/°C above that temperature. At maximum rated continuous current (±80mA per channel) and worst-case R_ON (5.7Ω), power dissipation remains well below this limit-typically under 40mW. Junction temperature rise is minimal in normal operation, supporting reliable function in sealed enclosures or stacked PCB assemblies without forced airflow or heatsinking.

How does the MAX4730EXT+T compare to the MAX4730ELT+T in terms of electrical performance?

The MAX4730EXT+T and MAX4730ELT+T share identical electrical specifications-including R_ON, leakage, bandwidth, and timing-because they belong to the same silicon die family and are tested to the same limits per the datasheet. The only difference is packaging: EXT+T uses the 6-pin SC70, while ELT+T uses the 6-pin µDFN. Both are rated for -40°C to +85°C and RoHS-compliant. Layout, thermal, and board-space requirements differ, but system-level analog performance of the MAX4730EXT+T matches that of the MAX4730ELT+T in all validated operating conditions.