Analog Devices Inc./Maxim Integrated MAX4535CPD

Overview

MAX4535CPD from Maxim Integrated is a dual 2-to-1 fault-protected 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 - used in avionics signal routing and industrial redundant systems where overvoltage resilience is critical.

For engineers reviewing the MAX4535CPD datasheet, MAX4535CPD pinout, MAX4535CPD application, or MAX4535CPD equivalent, this page delivers verified specifications, validated dual-channel switching behavior, confirmed fault-response timing (20ns typ), and real-world design implications for high-voltage analog signal selection under fault conditions.

Technical Context

The MAX4535CPD implements dual independent 2-to-1 multiplexers using parallel N- and P-channel FETs per channel to achieve low on-resistance and rail-to-rail signal pass-through. Each NO_ input is fault-protected with dedicated comparators that clamp COM output to V+ or V− within ~150mV of rail violation.

Fault response is hardware-autonomous: NO_ pins become high-impedance during overvoltage, while COM outputs are actively clamped via booster FETs sourcing/sinking up to ±10mA. COM_, EN, and A_ pins lack fault protection and must remain within supply rails.

Key Specifications

Pinout & Package

MAX4535CPD uses a 14-pin plastic DIP package rated for 0°C to +70°C operation. Pin functions are electrically isolated from ground; analog signal paths are fully floating relative to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-1 fault-protected multiplexer applications.

Compared with MAX4535ESD and ADG508FBRUZ, the MAX4535CPD provides optimal fit for cost-sensitive, commercial-temperature dual-channel routing where DIP packaging and legacy through-hole assembly are required - without compromising fault resilience or signal fidelity.

Availability

MAX4535CPD is available at Aetrix Electronics and suitable for avionics signal routing, industrial redundant systems, and data-acquisition front-ends requiring stable component supply across extended production lifecycles.

Supply support for MAX4535CPD 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 MAX4535CPD belongs to Maxim's fault-protected analog switch family, engineered specifically for high-voltage signal routing in safety-critical systems where overvoltage survival and rail-to-rail fidelity are non-negotiable.

FAQ

What is the maximum allowable voltage on NO_ pins of the MAX4535CPD when supplies are powered off?

The MAX4535CPD guarantees ±40V fault protection on NO_ pins with supplies off - meaning NO_ may safely tolerate voltages from –40V to +40V referenced to GND, regardless of V+ or V− state. This enables safe connection to unpowered subsystems or field wiring during maintenance without risk of damage. The MAX4535CPD's internal protection remains fully active even with zero supply bias.

Does the MAX4535CPD require power-supply sequencing during startup?

No, the MAX4535CPD does not require power-supply sequencing. Its architecture tolerates arbitrary ramp rates and orders of V+ and V− application - V+ may rise before V−, after V−, or simultaneously, with no risk of latch-up or parametric shift. This simplifies power-management design in multi-rail avionics or industrial control systems. The MAX4535CPD remains functional and fault-protected throughout all sequencing scenarios.

Can COMA and COMB outputs of the MAX4535CPD be connected to voltages outside the V+ to V− range?

No - COMA and COMB are not fault-protected. Connecting either COM pin to a voltage outside the V− to V+ range forward-biases internal ESD diodes, risking permanent damage. The MAX4535CPD datasheet explicitly states COM pins must remain within supply rails at all times. Fault protection applies only to NO_ inputs; COM outputs rely on external clamping or proper load referencing to V+ or V−.

What is the typical on-resistance match between channels in the MAX4535CPD?

The MAX4535CPD guarantees ≤10Ω maximum on-resistance mismatch (∆RON) between any two channels under identical conditions (V+ = +15V, V− = –15V, TA = +25°C). This tight matching ensures consistent gain and minimal channel-to-channel error in precision ratiometric measurements - critical in data-acquisition systems using switched sensor arrays. The MAX4535CPD achieves this via matched FET geometry and symmetric layout in its dual 2-to-1 structure.

How does the MAX4535CPD behave during a positive overvoltage fault on NO1A?

When NO1A exceeds V+ by ~150mV, the MAX4535CPD's internal positive fault comparator triggers: NO1A instantly becomes high-impedance, and if the channel is enabled, COMA is actively clamped to V+ via an internal booster FET. Recovery occurs in ~2.5µs after the fault clears. This behavior is autonomous and requires no external components - a core feature of the MAX4535CPD's integrated fault protection architecture.