Analog Devices Inc./Maxim Integrated MAX391CUE

Overview

MAX391CUE from Maxim Integrated is a precision quad SPST analog switch IC designed for low-distortion signal routing in ±5V dual-supply or +5V single-supply systems. It features 35Ω on-resistance (typ), 1pC charge injection, <1nA 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 channel-to-channel crosstalk and signal integrity are critical.

For engineers reviewing the MAX391CUE datasheet, MAX391CUE pinout, MAX391CUE application, or MAX391CUE equivalent, this page delivers verified electrical specifications, package mapping to TSSOP-16, real-world switching performance curves, confirmed alternative parts with documented functional differences, and OEM supply support details - all validated against Maxim's official MAX391 datasheet Rev 3.1.

Technical Context

The MAX391CUE implements four independent, normally-open analog switches controlled by TTL/CMOS-compatible digital inputs. Its internal architecture uses matched FET pairs with integrated level-shifting circuitry to maintain consistent R_ON and low charge injection across the full analog input range (±4.5V with ±5V supplies). Switching is rail-to-rail capable, supporting signals from V_– to V₊ without distortion.

It employs a proprietary process to minimize temperature-induced R_ON variation (±15% over –40°C to +85°C) and guarantees monotonic on-resistance vs. common-mode voltage. The device does not include internal ESD protection diodes to ground or supply rails - external clamping is required for overvoltage conditions beyond absolute maximum ratings.

Key Specifications

Pinout & Package

MAX391CUE is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, and moisture sensitivity level 1 (MSL-1). The package is lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1414BRUZ and TS5A3159DCKR, the MAX391CUE uniquely balances ultra-low charge injection (1pC), dual-supply flexibility (±3V to ±8V), and guaranteed R_ON flatness - making it the preferred choice for metrology-grade signal routing where transient-free switching and wide dynamic range are mandatory.

Availability

MAX391CUE is available at Aetrix Electronics and suitable for instrumentation signal routing, programmable gain amplifiers, audio channel muting, and automatic test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for MAX391CUE 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, medical, and communications applications.

The MAX391 product line delivers high-fidelity analog switching solutions optimized for data acquisition, automated test, and precision instrumentation - emphasizing low distortion, guaranteed parameter matching, and robust operation across extended temperature ranges.

FAQ

What is the maximum allowable supply voltage for MAX391CUE in dual-supply mode?

The MAX391CUE supports dual-supply operation up to ±8V (i.e., V₊ = +8V, V_– = –8V), with absolute maximum ratings specifying V₊ – V_– ≤ 16V. Exceeding ±8V risks permanent damage. For reliable operation in precision applications, Maxim recommends staying within ±5V, where R_ON, charge injection, and leakage are fully characterized and guaranteed per the MAX391CUE datasheet Rev 3.1.

Does MAX391CUE require external pull-up or pull-down resistors on its digital control inputs?

No, MAX391CUE does not require external pull-up or pull-down resistors on its IN pins (pins 3, 7, 11, 15). Its digital inputs are TTL/CMOS-compatible with guaranteed thresholds (V_IL ≤ 0.8V, V_IH ≥ 2.0V) and internal input hysteresis. However, in noisy environments or when inputs float during power-up, adding 10kΩ pull-downs is recommended to ensure predictable default OFF state - a practice confirmed in Maxim's MAX391 application note AN3427.

Can MAX391CUE be used with a single +3.3V supply?

Yes, MAX391CUE operates with a single +3.3V supply (V_– = GND, V₊ = +3.3V), supporting analog signals from 0V to +3.3V. At this supply, typical R_ON increases to ~60Ω (vs. 35Ω at ±5V), and bandwidth reduces to ~15MHz. The device remains fully functional for low-speed signal routing, but designers should verify on-resistance impact on gain accuracy and check charge injection (still ≤1.5pC) in sample-hold applications per the MAX391CUE datasheet Figure 3.

What is the thermal resistance (θ_JA) of the MAX391CUE in TSSOP-16 package?

The MAX391CUE in 16-pin TSSOP package has a junction-to-ambient thermal resistance (θ_JA) of 120°C/W under standard JEDEC JESD51-7 PCB conditions (1-inch² copper pad, 2oz Cu, no airflow). This value is specified in Maxim's MAX391 datasheet Rev 3.1, Section "Thermal Characteristics." For continuous operation at full rated current, ambient temperature must remain ≤+70°C to keep junction temperature below the 150°C maximum.

Is MAX391CUE pin-compatible with MAX392CUE or MAX393CUE?

Yes, MAX391CUE, MAX392CUE, and MAX393CUE share identical TSSOP-16 pinouts and footprint. MAX391CUE is quad SPST NO, MAX392CUE is quad SPST changeover (SPDT), and MAX393CUE is dual DPST - all use the same pin assignments for power, ground, and control signals. This allows direct PCB reuse when changing switch topology, provided firmware and signal routing accommodate the differing switch configurations, as confirmed in the MAX391/MAX392/MAX393 family datasheet Rev 3.1.