Analog Devices Inc./Maxim Integrated MAX391EUE

Overview

MAX391EUE from Maxim Integrated is a precision quad SPST analog switch IC designed for low-leakage, low-charge-injection signal routing in ±5V dual-supply or +5V single-supply systems. It features 100Ω on-resistance (typ), <1pC charge injection, ±20nA max off-leakage at +85°C, and operates from -40°C to +85°C. It is used in data acquisition front-ends, programmable gain amplifiers, and automatic test equipment where signal integrity and channel isolation are critical.

For engineers reviewing the MAX391EUE datasheet, MAX391EUE pinout, MAX391EUE application, or MAX391EUE equivalent, key selection criteria include guaranteed R_ON flatness over signal range, sub-pC charge injection for minimal settling error, low temperature drift of leakage currents, and compatibility with both dual-rail and single-rail operation without performance degradation.

Technical Context

The MAX391EUE implements four independent, normally-open analog switches using high-voltage CMOS process technology. Each switch supports rail-to-rail analog signal swing and maintains consistent R_ON (±10Ω variation) across its full ±4.5V common-mode input range under ±5V supplies. Control logic is TTL/CMOS-compatible with 0.8V/2.4V thresholds.

Its architecture minimizes parasitic capacitance (C_ON = 40pF, C_OFF = 12pF), enabling fast switching (t_ON/t_OFF = 75ns/45ns) while preserving bandwidth (>50MHz) and minimizing crosstalk (<–80dB at 1MHz). The device is fully specified over temperature and supply voltage variations without derating.

Key Specifications

Pinout & Package

MAX391EUE is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, optimized for compact PCB layouts and thermal performance in mixed-signal systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1414BRUZ and TS5A3159DCKR, the MAX391EUE uniquely balances low leakage, rail-to-rail operation, and dual-supply flexibility-making it optimal for precision mixed-signal systems where ±5V infrastructure and sub-20nA leakage coexist as hard requirements.

Availability

MAX391EUE is available at Aetrix Electronics and suitable for instrumentation multiplexers, programmable gain amplifiers, automatic test equipment, and medical signal conditioning requiring stable component supply and long-term production continuity.

Supply support for MAX391EUE 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 computing markets.

The MAX391 series was designed specifically for precision analog signal routing in data acquisition and test systems, emphasizing low distortion, minimal charge injection, and guaranteed performance across extended temperature and supply ranges.

FAQ

What is the maximum allowable supply voltage for MAX391EUE in dual-supply mode?

The MAX391EUE supports dual-supply operation from ±3V to ±6V. Exceeding ±6V on either rail risks permanent damage. For example, applying ±5.5V is within specification and commonly used in industrial control systems where the MAX391EUE routes ±4.5V sensor signals without clipping or increased leakage.

Does MAX391EUE require external pull-up or pull-down resistors on its IN pins?

No, MAX391EUE does not require external biasing on its IN pins. Its TTL/CMOS-compatible inputs have internal threshold circuitry (0.8V low, 2.4V high) that reliably interprets standard logic levels. This simplifies interface design with microcontrollers and FPGAs, eliminating board space and BOM cost associated with external resistors in systems using the MAX391EUE.

Can MAX391EUE operate with V− tied to GND and only a positive supply applied?

Yes, MAX391EUE supports single-supply operation with V− connected to GND and V+ ranging from +3V to +12V. In this configuration, the COM pin accepts signals from 0V to V+ − 1V (e.g., 0V to +4V with +5V supply), maintaining full functionality. This mode is widely used in battery-powered data loggers where the MAX391EUE switches unipolar sensor outputs.

How does charge injection of MAX391EUE affect settling time in sample-and-hold circuits?

The MAX391EUE's typical charge injection of <1pC introduces minimal voltage step error on hold capacitors. For a 1000pF capacitor, this yields <1mV glitch-enabling sub-1μs settling to 16-bit accuracy. This behavior is validated in MAX391EUE application notes for precision data acquisition, where it replaces mechanical relays in high-reliability S/H stages.

Is MAX391EUE pin-compatible with other devices in the MAX39x family?

Yes, MAX391EUE shares identical pinout and footprint with MAX392EUE (dual SPST) and MAX393EUE (dual SPDT) in the same TSSOP-16 package. This allows direct substitution in existing layouts when channel count or switch topology changes-reducing redesign effort while retaining the same low-leakage, low-R_ON performance characteristics of the MAX391EUE.