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 +25°C, and operates across –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 CMOS process technology optimized for low distortion and high off-isolation. Each switch supports rail-to-rail analog signal swing up to ±4.5V with V_COM referenced to either supply rail or ground, depending on configuration.

Its control logic accepts TTL/CMOS-compatible inputs referenced to V+, enabling direct interfacing with microcontrollers and FPGAs. The device guarantees monotonic R_ON vs. V_COM behavior and maintains stable leakage characteristics across its full operating temperature range (–40°C to +85°C).

Key Specifications

Pinout & Package

MAX391EUE+ is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, measuring 5.0mm × 4.4mm × 1.1mm. This thermally enhanced, surface-mount package supports automated assembly and provides adequate power dissipation for continuous analog switching.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1412BRUZ and TS5A23157DCUR, the MAX391EUE+ uniquely balances rail-to-rail analog performance, dual/single-supply flexibility, industrial temperature rating, and sub-pC charge injection-making it the preferred choice for precision measurement and reconfigurable instrumentation where signal fidelity and environmental robustness are co-prioritized.

Availability

MAX391EUE+ is available at Aetrix Electronics and suitable for data acquisition systems, programmable gain amplifiers, and automatic test equipment requiring stable component supply, long-term manufacturability, and guaranteed parametric performance across temperature extremes.

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 applications.

The MAX391 series belongs to Maxim's precision analog switch product line, engineered specifically for applications demanding low distortion, minimal charge injection, and stable leakage behavior in demanding measurement and control environments.

FAQ

What is the maximum signal voltage range supported by the MAX391EUE+?

The MAX391EUE+ supports analog signal voltages from V– + 0.5V to V+ – 0.5V. With ±5V dual supplies, this allows rail-to-rail operation from –4.5V to +4.5V. When operated on a +5V single supply (V– = GND), the usable signal range is 0.5V to 4.5V. Exceeding these limits risks increased leakage or latch-up. The MAX391EUE+ datasheet specifies these absolute maximum ratings under "Electrical Characteristics."

Does the MAX391EUE+ require external pull-up or pull-down resistors on its digital control inputs?

No, the MAX391EUE+ does not require external pull-up or pull-down resistors on its IN pins. Its TTL/CMOS-compatible inputs have defined thresholds referenced to V+, with guaranteed high-level input voltage ≥2.0V (for V+ = 5V) and low-level input voltage ≤0.8V. Internal input structure ensures valid logic states without external biasing, simplifying interface design with microcontrollers and FPGAs.

How does charge injection of the MAX391EUE+ affect sample-and-hold circuit performance?

The MAX391EUE+'s typical charge injection of <1pC directly determines the voltage glitch injected into the hold capacitor during switching. For a 10nF capacitor, this results in a worst-case glitch of <0.1mV - well within resolution limits of 16-bit+ ADCs. This low value minimizes settling time and avoids corruption of sampled values, making the MAX391EUE+ suitable for high-fidelity data acquisition where aperture uncertainty must be tightly controlled.

Can the MAX391EUE+ operate reliably at –40°C ambient temperature?

Yes, the MAX391EUE+ is fully specified and guaranteed to operate across –40°C to +85°C. Its off-leakage current remains ≤±100nA and on-resistance variation stays within datasheet limits over this full industrial temperature range. Thermal characterization data in the MAX391EUE+ datasheet confirms stable R_ON vs. temperature curves and leakage correlation, validating use in cold-environment instrumentation and outdoor deployed systems.

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

Yes, the MAX391EUE+ shares identical pinout and package (16-pin TSSOP) with the MAX392EUE+ (dual SPDT), MAX393EUE+ (quad SPST, different logic polarity), and MAX351EUE+ (quad SPST, higher voltage rating). This allows drop-in replacement in many designs, though logic polarity and absolute maximum ratings differ - always verify control signal mapping and supply constraints before substitution.