Analog Devices Inc./Maxim Integrated MAX328EWE-T

Overview

The MAX328EWE-T from Maxim Integrated is a monolithic CMOS 1-of-8 single-ended analog multiplexer with ultra-low off-leakage (1pA typ at +25°C), 2.5kΩ on-resistance, and ±5V to ±18V dual-supply or 10V–30V single-supply operation. It serves as a precision signal-routing device in high-impedance data-acquisition paths, enabling fault-tolerant operation when paired with external 40kΩ input resistors - sustaining indefinite 110V AC faults while maintaining <40nV error for normal signals.

For engineers reviewing the MAX328EWE-T datasheet, MAX328EWE-T pinout, MAX328EWE-T application, or MAX328EWE-T equivalent, this device is selected for low-error analog switching in aerospace HUDs, industrial control systems, and portable data loggers where leakage-induced offset, rail-to-rail signal handling, and TTL/CMOS logic compatibility are critical design constraints.

Technical Context

The MAX328EWE-T implements a fully decoded 3-bit address decoder (A0–A2) controlling eight bidirectional analog switches between S1–S8 inputs and a common D output. Its latchup-proof CMOS process ensures robust operation across unbalanced supply combinations (e.g., +12V/−5V) without performance degradation.

Switching is governed by an active-high EN input, with break-before-make timing (0.2µs) and sub-1.5µs transition time. The device supports rail-to-rail analog signal ranges (±15V with ±15V supplies), and its charge injection (4pC max) and low off-capacitance (1.8pF) preserve signal integrity in high-resolution ADC front-ends.

Key Specifications

Pinout & Package

MAX328EWE-T is housed in a 16-pin Wide SO (SOIC-W) package with exposed pad (RoHS-compliant, lead-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG508ACJ and MAX358EWE+, the MAX328EWE-T delivers three orders of magnitude lower leakage, guaranteed fault tolerance, and extended temperature qualification - making it the sole option for high-accuracy, safety-aware analog multiplexing in harsh environments.

Availability

MAX328EWE-T is available at Aetrix Electronics and suitable for aircraft heads-up displays, industrial control systems, and portable data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX328EWE-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 demanding industrial, aerospace, and medical applications.

The MAX328EWE-T belongs to Maxim's ultra-low-leakage analog multiplexer product line, engineered specifically for high-impedance signal routing in fault-prone, high-accuracy measurement systems where traditional muxes introduce unacceptable offset or reliability risk.

FAQ

What is the operating temperature range of the MAX328EWE-T?

The MAX328EWE-T is rated for −40°C to +85°C operation, validated across the full range for key parameters including off-leakage, on-resistance, and switching time. This extended industrial temperature grade makes it suitable for deployment in automotive engine compartments, outdoor instrumentation, and avionics subsystems where ambient extremes are expected. All leakage specifications are 100% tested at +85°C and correlated at +25°C per Maxim's production test protocol.

Is the MAX328EWE-T pin-compatible with the DG508 series?

Yes, the MAX328EWE-T is explicitly designed as a pin-for-pin replacement for the DG508/DG509 in standard 16-pin SO and DIP footprints. Its pin mapping matches exactly - including V+, V−, GND, EN, A0–A2, S1–S8, and D - enabling direct substitution without PCB modification. However, unlike the DG508, the MAX328EWE-T adds fault-tolerance capability and achieves 1000× lower leakage, delivering measurable system-level improvements in accuracy and reliability.

How does the MAX328EWE-T achieve fault tolerance with 110V AC?

The MAX328EWE-T achieves indefinite 110V AC fault tolerance when used with 40kΩ resistors on each analog input (S1–S8). These resistors limit fault current to safe levels while leveraging the device's internal ESD diodes to clamp input voltage to ±15.7V. With 1pA max leakage, the resulting error is <40nV (1pA × 40kΩ), preserving signal fidelity. No external diodes are needed - a key differentiator from legacy multiplexers like the DG508 that require additional protection circuitry.

What supply configurations does the MAX328EWE-T support?

The MAX328EWE-T operates with dual supplies from ±5V to ±18V or a single supply from 10V to 30V. It also supports unbalanced configurations such as +12V/−5V or +5V/−15V without performance loss. This flexibility allows integration into legacy ±15V systems, modern low-voltage battery-powered instruments, and hybrid power architectures - all while maintaining rail-to-rail analog signal handling and consistent leakage performance.

Does the MAX328EWE-T support bidirectional signal flow?

Yes, the MAX328EWE-T supports fully bidirectional analog signal routing: any Sx pin can serve as input or output, and the D pin functions equivalently in both directions. This enables use as either a multiplexer (eight inputs → one output) or demultiplexer (one input → eight outputs) depending on system configuration. Bidirectionality is inherent to its CMOS switch architecture and requires no mode-setting pins or external control logic.