Analog Devices Inc./Maxim Integrated MAX4708ESE+T

Overview

The MAX4708ESE+T from Maxim Integrated is a fault-protected, single 8-to-1 analog multiplexer IC designed for high-reliability signal routing in harsh voltage environments. It delivers ±40V overvoltage protection with supplies off, 400Ω max on-resistance, rail-to-rail signal handling, and operates from ±4.5V to ±20V dual supplies or +9V to +36V single supply. It is used in industrial process control systems where channel fault isolation and uninterrupted signal integrity are critical.

For engineers reviewing the MAX4708ESE+T datasheet, MAX4708ESE+T pinout, MAX4708ESE+T application, or MAX4708ESE+T equivalent, this page provides verified specifications, fault-protection behavior under overvoltage transients, truth-table–driven channel selection logic, and validated alternatives for redundant signal-path designs requiring ±40V fault tolerance and sub-100ns fault response.

Technical Context

The MAX4708ESE+T implements dual parallel FET (N+P) switch architecture per channel-unlike legacy triple-FET designs-enabling lower on-resistance and flatter R_ON vs. V_COM across temperature and supply range. Its fault detection uses dual comparators monitoring each NO_x input against V+ and V− rails, triggering simultaneous turn-off of both FETs within 100ns when exceeded.

During fault events, COM remains high-impedance regardless of EN or address state, isolating downstream circuitry without latch-up or rail clamping. The device requires no power-supply sequencing, supports TTL/CMOS logic inputs at +12V or ±15V supplies, and maintains full rail-to-rail analog conduction (V_NO = V− to V+) during normal operation.

Key Specifications

Pinout & Package

MAX4708ESE+T is housed in a 16-pin narrow SOIC (SO) package with standard 1.27mm pitch and exposed pad not present. Pin 14 is GND; pin 13 is V+; pin 3 is V−; pin 8 is COM (common output); pins 4–7 and 9–12 are NO1–NO8 (normally open inputs); pins 1, 15, and 16 are A0, A2, A1 (3-bit address); pin 2 is EN (enable).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4709ESE+T, the MAX4708ESE+T offers centralized 8-channel routing ideal for single-ADC architectures, whereas ADG508FBRUZ trades fault robustness for lower R_ON and cost-making it viable only where transient threats are bounded and design margins permit external protection.

Availability

MAX4708ESE+T is available at Aetrix Electronics and suitable for industrial process control, avionics redundancy systems, and automated test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX4708ESE+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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX4708ESE+T belongs to Maxim's fault-protected analog switch family, engineered specifically for mission-critical signal routing in environments with unpredictable voltage transients, such as factory automation, aerospace, and energy infrastructure.

FAQ

What is the maximum allowable voltage on NO pins of the MAX4708ESE+T when power supplies are off?

The MAX4708ESE+T guarantees ±40V fault protection on all NO_x pins with V+ = V− = 0V. This means the device safely withstands up to +40V or −40V on any NO input without damage or leakage current exceeding ±10µA, making it ideal for pre-power-up field wiring. The MAX4708ESE+T maintains high-impedance isolation on both NO_x and COM during this condition.

Does the MAX4708ESE+T require external clamping diodes for overvoltage protection?

No. The MAX4708ESE+T integrates internal fault-protection circuitry that actively disconnects the selected channel during overvoltage events - unlike older multiplexers (e.g., MAX4508) that clamp to rails. External clamps are unnecessary for its rated ±40V fault range, though they may be added for >±40V system-level protection. The MAX4708ESE+T's architecture eliminates reliance on external diodes.

Can the MAX4708ESE+T operate with asymmetric dual supplies, such as +12V and −5V?

Yes. The MAX4708ESE+T supports asymmetric dual supplies as long as the absolute difference |V+ − V−| does not exceed 44V and each rail stays within its Absolute Maximum Rating (V+ ≤ +44V, V− ≥ −44V). For example, +12V/−5V (17V total) is fully supported and maintains full ±36V fault protection. The MAX4708ESE+T's internal logic and FET biasing adapt dynamically to rail asymmetry.

How does the MAX4708ESE+T behave during a fault condition on a non-selected channel?

The MAX4708ESE+T provides channel-specific fault isolation: only the channel whose NO_x input experiences overvoltage enters high-impedance mode. Unselected channels remain fully functional, and COM continues normal conduction for the currently addressed NO_x. This ensures uninterrupted operation in multi-channel scanning systems - a key advantage over global-fault devices. The MAX4708ESE+T's per-channel architecture prevents single-point failure propagation.

What is the recommended bypass capacitance for V+ and V− pins of the MAX4708ESE+T?

Maxim specifies a 0.1µF ceramic capacitor from each of V+ and V− to GND, placed as close as possible to the respective pins. These capacitors stabilize internal charge pumps and reduce noise coupling into the analog signal path. For high-noise environments or fast-switching loads, adding a parallel 1µF tantalum or polymer capacitor improves low-frequency decoupling. The MAX4708ESE+T's performance - especially R_ON flatness and fault recovery - depends critically on proper local bypassing.