Analog Devices Inc./Maxim Integrated MAX4708EPE+

Overview

The MAX4708EPE+ from Maxim Integrated is a fault-protected single 8-to-1 analog multiplexer in a 16-pin plastic DIP package, featuring ±40V overvoltage protection with supplies off, 400Ω max on-resistance, rail-to-rail signal handling, and dual-supply operation from ±4.5V to ±20V. It serves as a robust signal-routing switch in high-reliability industrial data-acquisition systems where input faults must not propagate or damage downstream circuitry.

For engineers reviewing the MAX4708EPE+ datasheet, MAX4708EPE+ pinout, MAX4708EPE+ application, or MAX4708EPE+ equivalent, key selection criteria include fault-response time (100ns), channel-to-channel on-resistance matching (15Ω max), ±25V fault protection under ±15V supplies, TTL/CMOS-compatible logic inputs, and absence of clamp diodes on switch outputs-critical for unclamped high-voltage transient environments.

Technical Context

The MAX4708EPE+ implements a parallel N-channel/P-channel FET architecture per switch channel, enabling lower on-resistance and flatter R_ON vs. V_COM than legacy triple-FET designs. Its fault detection uses dual comparators monitoring each NO_x input against V+ and V− rails, triggering simultaneous turn-off of both FETs upon overvoltage.

During fault conditions, COM is driven to high-impedance-regardless of EN or address state-while non-selected channels remain fully operational. The device requires no power-supply sequencing, supports single +9V to +36V or dual ±4.5V to ±20V supplies, and maintains rail-to-rail analog signal range without clamping diodes to supply rails.

Key Specifications

Pinout & Package

MAX4708EPE+ is housed in a 16-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 14 is GND; pins 3 and 13 are V− and V+, respectively; 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, and 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 MAX4711EPE+ and ADG508FKNZ, the MAX4708EPE+ uniquely combines ±40V fault tolerance, 100ns response, rail-to-rail operation, and no sequencing requirement - making it the only option qualified for high-speed, high-voltage industrial and aerospace multiplexing where signal integrity and fault containment are non-negotiable.

Availability

MAX4708EPE+ is available at Aetrix Electronics and suitable for data-acquisition systems, industrial process control, and avionics signal routing requiring stable component supply across extended product lifecycles and rigorous environmental qualification.

Supply support for MAX4708EPE+ 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, automotive, and communications applications.

The MAX4708EPE+ belongs to Maxim's fault-protected analog switch family, engineered specifically for high-reliability signal routing in environments exposed to frequent overvoltage transients, such as factory automation, test equipment, and aerospace subsystems.

FAQ

What is the maximum fault voltage the MAX4708EPE+ can withstand with power supplies disconnected?

The MAX4708EPE+ sustains ±40V on its NO_x inputs when V+ and V− are at 0V - verified per Absolute Maximum Ratings and Electrical Characteristics tables. This enables safe operation during hot-swap events or maintenance where external signals remain active while power is removed. The device enters high-impedance mode on both NO_x and COM during such faults, protecting downstream circuitry without requiring external TVS devices.

Does the MAX4708EPE+ require power-supply sequencing during startup?

No, the MAX4708EPE+ does not require power-supply sequencing. Its internal architecture allows V+ and V− to be applied in any order or simultaneously without causing latch-up, current surges, or undefined logic states. This eliminates the need for external sequencing circuits in modular systems or field-upgradeable equipment where supply ramp times vary across boards.

Is the COM pin fault-protected on the MAX4708EPE+?

No, the COM pin on the MAX4708EPE+ is not fault-protected. Per the datasheet's Pin Descriptions and Detailed Description sections, only NO_x inputs have integrated fault protection. COM must be kept within the V− to V+ supply rails at all times; exceeding these limits risks permanent damage. External clamping or isolation is required if COM connects to potentially overvoltage nodes.

What is the on-resistance matching specification for the MAX4708EPE+ across all eight channels?

The MAX4708EPE+ guarantees ≤15Ω maximum on-resistance matching (ΔR_ON) between any two channels under V_COM = ±10V and I_NO = 0.2mA conditions. This tight matching ensures consistent gain and offset performance when multiplexing precision sensor signals or calibration references - critical for multi-channel data loggers requiring <0.1% channel-to-channel error.

Can the MAX4708EPE+ operate from a single +12V supply?

Yes, the MAX4708EPE+ supports single-supply operation from +9V to +36V with V− tied to GND. At +12V, it delivers 950Ω max on-resistance and maintains ±40V fault protection with supplies off. Logic inputs remain TTL/CMOS-compatible (VIH = 2.4V, VIL = 0.8V), allowing direct connection to +12V microcontrollers without level translation - simplifying power architecture in compact industrial controllers.