Analog Devices Inc./Maxim Integrated MAX328EWE+T

Overview

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 operation. It serves as a precision signal-routing switch in high-impedance data-acquisition front-ends, enabling fault-tolerant operation up to 110V AC when paired with external 40kΩ input resistors.

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 control systems, aircraft HUDs, and portable instrumentation where leakage-induced offset and rail-to-rail signal handling are critical.

Technical Context

The MAX328EWE+T implements a CMOS transmission-gate architecture with latchup-proof construction and break-before-make switching (0.2µs interval). Its address decoding logic accepts TTL/CMOS-compatible inputs (A0–A2) and enables channel selection via an active-high EN pin, supporting bidirectional analog signal flow between any Sx input and the D output terminal.

It operates across unbalanced supply combinations (e.g., +12V/–5V) and maintains guaranteed leakage performance over –40°C to +85°C. The device's analog signal range extends to the power rails (±15V typical), and its charge injection is limited to 4pC - critical for sample-and-hold accuracy in successive-approximation ADC interfaces.

Key Specifications

Pinout & Package

MAX328EWE+T is housed in a 16-pin Wide SO (SOIC-W) RoHS-compliant package with exposed pad (EP), rated for –40°C to +85°C operation. Pin 1 is A0; pin 16 is EN. The exposed pad must be connected to V+ per manufacturer guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX328CWE+, MAX328EWE+T adds extended temperature support and identical fault tolerance; compared with ADG508AKRZ, it delivers 200× lower leakage and built-in AC fault resilience - making it superior for precision, safety-critical, or harsh-environment signal routing.

Availability

MAX328EWE+T is available at Aetrix Electronics and suitable for industrial data logging, aircraft HUDs, portable medical instrumentation, and high-voltage test equipment 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX328EWE+T belongs to Maxim's precision analog multiplexer product line, designed specifically for low-leakage, fault-tolerant signal routing in measurement and control systems where signal integrity and reliability are non-negotiable.

FAQ

What is the maximum continuous analog signal voltage range supported by the MAX328EWE+T?

The MAX328EWE+T supports an analog signal range of ±15V when operated with ±15V supplies, and its inputs can swing rail-to-rail - meaning signals may extend to the positive and negative supply voltages. Absolute maximum ratings permit V+ up to +44V referenced to V−, but functional analog range remains bounded by the applied supply rails. This makes MAX328EWE+T suitable for interfacing with industrial sensors and actuators operating near supply limits.

Does the MAX328EWE+T require external protection components to achieve 110V AC fault tolerance?

No - the MAX328EWE+T achieves 110V AC fault tolerance with only two external 40kΩ, 1/2W resistors per input channel, as confirmed in the datasheet's Figure 4 application circuit. Its internal ESD diodes clamp overvoltage to the rails, eliminating the need for discrete external diodes required by older multiplexers like the DG508. This simplifies layout and improves reliability in MAX328EWE+T-based designs.

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

Yes - the MAX328EWE+T is explicitly specified as a pin-for-pin replacement for the DG508 in the datasheet's General Description and Features sections. All 16 pins - including A0–A2, EN, V+, V−, GND, S1–S8, and D - map identically between MAX328EWE+T and DG508, enabling direct substitution without PCB modification or firmware changes.

What is the typical on-resistance matching between channels in the MAX328EWE+T?

The MAX328EWE+T guarantees a maximum 2% variation in on-resistance between channels (R_DS(ON) max − R_DS(ON) min / R_DS(ON) avg), measured at ±15V supplies and +25°C. This tight matching ensures consistent gain and settling behavior across all eight channels - essential for calibration-critical applications such as automatic test equipment and multi-sensor data acquisition where channel-to-channel uniformity affects measurement accuracy.

Can the MAX328EWE+T operate from unbalanced dual supplies, such as +12V and –5V?

Yes - the MAX328EWE+T is fully characterized for unbalanced dual-supply operation, including combinations like +12V/–5V and +5V/–15V. Its internal circuitry does not require symmetrical rails, and all key parameters (leakage, on-resistance, switching speed) remain within specification across these configurations. This flexibility simplifies power design in mixed-voltage systems where MAX328EWE+T interfaces with both analog and digital subsystems.