Analog Devices Inc./Maxim Integrated MAX4534CUD+T

Overview

The MAX4534CUD+T from Maxim Integrated is a fault-protected, single 4-to-1 analog multiplexer with ±4.5V to ±20V dual-supply or +9V to +36V single-supply operation, 400Ω max on-resistance, ±40V fault protection with supplies off, and rail-to-rail signal handling. It routes industrial sensor signals in high-voltage data-acquisition systems where overvoltage transients are common.

For engineers reviewing the MAX4534CUD+T datasheet, MAX4534CUD+T pinout, MAX4534CUD+T application, or MAX4534CUD+T equivalent, this page delivers verified specifications, validated pin functions, confirmed fault-protection behavior under power-off conditions, and real-world routing use cases for avionics and process control.

Technical Context

The MAX4534CUD+T uses parallel N-channel and P-channel FETs per channel to achieve low on-resistance and true rail-to-rail signal conduction. Its dual-comparator fault-detection circuit clamps COM output to V+ or V− within 20ns when NO inputs exceed rails by ~150mV.

Fault response is supply-agnostic: ±40V protection applies with V+ = V− = 0, while ±25V protection holds with ±15V supplies active. All digital inputs meet TTL/CMOS thresholds at +12V or ±15V logic supplies, eliminating level-shifter requirements.

Key Specifications

Pinout & Package

MAX4534CUD+T is housed in a 14-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch), optimized for high-density industrial PCB layouts with thermal efficiency and moisture resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG508FBRUZ and TS5A3159DCKR, the MAX4534CUD+T uniquely combines ±40V power-off fault protection, rail-to-rail analog conduction, and wide dual/single-supply flexibility - making it the only viable option for high-reliability industrial and avionics signal routing where overvoltage resilience cannot be compromised.

Availability

MAX4534CUD+T is available at Aetrix Electronics and suitable for industrial data-acquisition systems, avionics signal routing, and process control I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4534CUD+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX4534CUD+T belongs to Maxim's fault-protected analog switch family, engineered specifically for signal routing in harsh environments where overvoltage transients, hot-swap operations, and supply loss events are routine.

FAQ

What is the maximum fault voltage the MAX4534CUD+T can withstand with power supplies disconnected?

The MAX4534CUD+T withstands ±40V on its NO1–NO4 pins when V+ and V− are both at 0V. This is explicitly guaranteed in the Absolute Maximum Ratings table and confirmed in the Fault Protection section. The device enters high-impedance state on NO pins, preventing current flow into the die. This capability makes MAX4534CUD+T suitable for systems where field wiring may remain energized during maintenance or power-down sequences.

Does the MAX4534CUD+T support rail-to-rail input signals when operated from a +12V single supply?

Yes, the MAX4534CUD+T supports rail-to-rail signal handling from 0V to +12V when V− is tied to GND. The internal parallel FET architecture ensures full conduction across the entire supply range, preserving DC accuracy and dynamic headroom for signals such as 0–10V industrial sensors or 4–20mA loop derivatives. This behavior is verified in the Typical Operating Characteristics curves (toc02 and toc04).

What happens to the COM output during a positive overvoltage fault on NO1 with the switch enabled?

When NO1 exceeds V+ by ~150mV while the MAX4534CUD+T switch is enabled, the internal positive fault comparator triggers, turning off the N1/P1 pass FETs and activating the P2 booster FET. This clamps the COM output to V+, limiting voltage excursion and sourcing up to 10mA from V+ to protect downstream circuitry. Recovery occurs in ~2.5µs once NO1 returns within rails.

Is the COM pin fault-protected on the MAX4534CUD+T?

No, the COM pin on the MAX4534CUD+T is not fault-protected. Per the datasheet's "Non-Fault-Protected Pins" section and Absolute Maximum Ratings Note 1, voltages applied to COM must remain strictly between V− and V+, or risk forward-conducting internal ESD diodes and causing permanent damage. External clamping or isolation is required if COM connects to potentially overvoltage-prone nodes.

Can the MAX4534CUD+T operate with asymmetric dual supplies, such as +12V and −5V?

Yes, the MAX4534CUD+T supports asymmetric dual supplies as long as the total differential (V+ − V−) does not exceed +44V and each rail stays within its Absolute Maximum Rating (V+ ≤ +44V, V− ≥ −44V). For example, +12V and −5V yields 17V differential - well within spec. Performance parameters like on-resistance and fault thresholds scale accordingly, as confirmed in Electrical Characteristics tables for non-symmetric conditions.