Analog Devices Inc./Maxim Integrated MAX367EWN+T

Overview

MAX367EWN+T from Maxim Integrated is an 8-channel, two-terminal analog signal-line circuit protector IC designed for series insertion in sensitive analog interfaces. It operates with bipolar supplies (±2.25V to ±18V) or unipolar supplies (4.5V to 36V), delivers ≤100Ω on-resistance with power applied, limits fault current via voltage-dependent high-impedance transition, and protects against ±40V overvoltage events - used in data-acquisition front-ends, hot-insertion I/O modules, and redundant sensor interfaces.

For engineers reviewing the MAX367EWN+T datasheet, MAX367EWN+T pinout, MAX367EWN+T application, or MAX367EWN+T equivalent, key selection criteria include its symmetrical two-terminal architecture per channel, automatic fault clamping at ~1.3V below V+ or ~2.0V above V−, sub-1nA leakage at +25°C, open-circuit behavior with power off, and compatibility with high-impedance op-amp inputs without degrading signal integrity.

Technical Context

The MAX367EWN+T integrates eight independent, symmetrical MOSFET-based protector cells, each composed of two N-channel and one P-channel enhancement-mode FETs. Its protection mechanism relies on gate-threshold–driven conduction: under normal conditions (signal within ~1.5V of rails), all three FETs conduct to maintain low-resistance signal path; during overvoltage, gate bias loss forces high-impedance state without latch-up or polarity reversal.

No control logic, programming pins, or external biasing is required - operation is fully autonomous and supply-powered. Fault response is bidirectional and rail-referenced: output clamps to (V+ − 1.3V) for positive faults and (V− + 2.0V) for negative faults, with fault current flowing exclusively between IN/OUT terminals - zero current through V+/V− pins.

Key Specifications

Pinout & Package

MAX367EWN+T is housed in a 18-pin Wide SO (Small Outline) package, 0.300-inch body width, with standard JEDEC MS-013AC footprint. Pin 1 is top-left corner (notch/dot side), pin numbering proceeds counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog signal-line protection applications.

Compared with MAX367CPN+ and MAX367EPN+, the MAX367EWN+T provides industrial-temperature reliability in surface-mount form factor with identical electrical performance - making it the default choice for volume production in factory automation, test equipment, and modular instrumentation where space, thermal cycling, and reflow compatibility matter.

Availability

MAX367EWN+T is available at Aetrix Electronics and suitable for process control systems, hot-insertion boards/systems, and data-acquisition systems requiring stable component supply across multi-year production cycles and industrial temperature operation.

Supply support for MAX367EWN+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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications - emphasizing robustness, integration, and low-power operation.

The MAX366/MAX367 family was engineered specifically for fault-tolerant analog signal routing in harsh environments, targeting applications where transient overvoltage, power sequencing uncertainty, and long-term reliability outweigh raw speed or ultra-low capacitance requirements.

FAQ

What is the maximum continuous fault voltage the MAX367EWN+T can withstand?

The MAX367EWN+T withstands up to ±40V differential between its IN and OUT terminals when V+ and V− are at 0V - the highest rated fault condition. With power applied, maximum fault voltage is supply-dependent: e.g., ±25V with ±15V supplies or ±35V with ±5V supplies. This rating is validated per Absolute Maximum Ratings table and applies regardless of power state.

Does the MAX367EWN+T require external components to operate?

No, the MAX367EWN+T requires no external resistors, capacitors, or control signals. It draws <1µA supply current and functions autonomously - V+ and V− provide both bias and protection reference. External surge suppressors (e.g., TVS diodes) may be used upstream for high-energy transients, but are not required for basic ±40V fault containment.

Can the input and output pins of each channel be swapped on the MAX367EWN+T?

Yes - every IN/OUT pair (e.g., IN1/OUT1, IN2/OUT2, etc.) is fully symmetrical and interchangeable. The device contains no internal directionality; pin labeling is for schematic clarity only. This allows flexible PCB routing and eliminates orientation constraints during layout.

What happens to signal integrity when the MAX367EWN+T is powered off?

When V+ and V− are at 0V, the MAX367EWN+T presents a virtual open circuit (>1000MΩ) between each IN/OUT pair. No DC path exists, and signals are fully isolated up to ±40V. There is no leakage-induced offset or loading - critical for preserving sensor bias points and preventing backfeeding in powered-down subsystems.

How does the MAX367EWN+T behave during power-up and power-down transitions?

During V+/V− ramp-up, the MAX367EWN+T remains in high-impedance (fault) state until supply exceeds the input voltage by ~1.5V; output then tracks input with ~1.3V/2.0V rail offset. During ramp-down, it reverts to open circuit before supplies reach 0V. No glitches, polarity reversals, or latch-up occur - verified in Typical Operating Characteristics curves.