Analog Devices Inc./Maxim Integrated MAX4781ETE+

Overview

MAX4781ETE+ from Maxim Integrated is an 8-channel CMOS analog multiplexer configured as a single-pole, eight-throw (SP8T) switch with 0.7Ω on-resistance at +3V supply, 11ns turn-on time, rail-to-rail signal handling, and operation from +1.6V to +3.6V. It serves as a high-speed signal routing device in low-voltage portable audio and data-acquisition systems.

For engineers reviewing the MAX4781ETE+ datasheet, MAX4781ETE+ pinout, MAX4781ETE+ application, or MAX4781ETE+ equivalent, this page delivers verified electrical parameters, thin QFN package details, functional truth table alignment, and direct alternatives for battery-powered signal-switching designs requiring sub-1Ω R_ON and nanosecond switching.

Technical Context

The MAX4781ETE+ implements a CMOS transmission-gate architecture with three address inputs (A/B/C) selecting one of eight bidirectional analog paths (X0–X7) to common output X. Its logic interface accepts +1.8V CMOS-compatible levels (VIH = 1.4V, VIL = 0.5V at +3V supply), and ENABLE asserts high to disable all channels simultaneously.

Internal ESD protection diodes clamp analog signals to VCC and GND, enabling rail-to-rail operation but requiring external current limiting if signals exceed supply rails. On-resistance flatness (0.1Ω) and matching (0.3Ω) are specified over full analog range (0V to VCC) at +3V, ensuring minimal gain error in precision multiplexed ADC front-ends.

Key Specifications

Pinout & Package

MAX4781ETE+ is housed in a 3mm × 3mm, 16-pin thin QFN package with exposed thermal pad (EP) that must be soldered to PCB ground for thermal and EMI performance. Pin 1 is marked by a dot or chamfered corner per JEDEC MO-220.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4781ETE+, MAX4617ESE+ trades speed and on-resistance for lower cost in legacy TSSOP layouts, while TMUX1308PWR offers improved R_ON and supply flexibility at the expense of different logic thresholds and slightly higher charge injection (±150pC).

Availability

MAX4781ETE+ is available at Aetrix Electronics and suitable for portable audio routing, low-voltage data-acquisition systems, and battery monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX4781ETE+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX4781ETE+ belongs to Maxim's high-speed analog switch/multiplexer product line, designed specifically for low-voltage, low-R_ON, nanosecond-switching signal routing in space-constrained portable electronics.

FAQ

What is the maximum continuous current rating for MAX4781ETE+ analog channels?

The MAX4781ETE+ supports ±150mA continuous current through any analog channel (X0–X7 or X). This rating applies across the full operating temperature range (-40°C to +85°C) and supply voltage range (+1.6V to +3.6V), making it suitable for driving headphones, sensors, or moderate-current signal paths without external buffering. Peak pulsed current is ±300mA at 10% duty cycle.

Does MAX4781ETE+ require external pull-up or pull-down resistors on address pins A/B/C?

No, MAX4781ETE+ does not require external biasing on A, B, or C address pins. These inputs have guaranteed VIH (1.4V min) and VIL (0.5V max) thresholds at +3V supply and exhibit only ±1µA leakage, allowing direct connection to CMOS logic outputs. Floating address pins are undefined and must be actively driven to avoid spurious channel selection.

Can MAX4781ETE+ operate with a 1.8V supply while maintaining full functionality?

Yes, MAX4781ETE+ operates fully from +1.6V to +3.6V. At +1.8V supply, it delivers 1.6Ω typical on-resistance, 17ns turn-on time, and retains rail-to-rail analog signal handling (0V to 1.8V). Logic thresholds adjust to VIH = 1.0V and VIL = 0.4V, ensuring compatibility with 1.8V microcontrollers without level shifters.

How is the exposed pad (EP) of MAX4781ETE+ intended to be connected?

The exposed pad (EP) of MAX4781ETE+ must be soldered to a solid PCB ground plane. It serves as both a thermal dissipation path (reducing θ_JA by ~30°C/W) and an EMI shield for the internal analog switches. Maxim specifies no thermal vias are required, but ≥4 thermal vias to inner ground layers are recommended for high-reliability applications.

Is MAX4781ETE+ pin-compatible with the 74HC4051 in the thin QFN package?

Yes, MAX4781ETE+ is explicitly pin-compatible with the industry-standard 74HC4051 in both TSSOP and thin QFN packages, including identical pin numbering, signal naming (X, X0–X7, A/B/C, ENABLE, VCC, GND), and truth table behavior. This allows drop-in replacement in existing layouts while delivering superior R_ON, speed, and low-voltage operation.