Analog Devices Inc./Maxim Integrated MAX4533EWP

Overview

MAX4533EWP from Maxim Integrated is a quad, single-pole/double-throw (SPDT), fault-protected analog switch with rail-to-rail signal handling, ±25V fault protection with power on, and 175Ω max on-resistance at ±15V supplies. It operates from dual ±4.5V to ±18V or single +9V to +36V supplies and features TTL/CMOS-compatible logic inputs. It is used in test equipment and industrial process control systems requiring robust overvoltage resilience.

For engineers reviewing the MAX4533EWP datasheet, MAX4533EWP pinout, MAX4533EWP application, or MAX4533EWP equivalent, key selection criteria include fault-protection voltage limits (±25V powered, ±40V unpowered), channel-to-channel on-resistance matching (≤10Ω), break-before-make timing (20ns typ), and wide-temperature operation (-40°C to +85°C) in 20-pin Wide SO package.

Technical Context

The MAX4533EWP employs parallel N-channel and P-channel MOSFETs per SPDT channel, enabling low on-resistance and true rail-to-rail analog signal conduction. Its internal voltage-sensing comparators monitor NO_/NC_ terminals continuously against V+ and V− rails.

During overvoltage faults, the switch disconnects the COM_ terminal from the faulty input within 20ns (typ), clamps COM_ to the appropriate supply rail via dedicated clamp FETs (N2/P2), and limits output current to ±10mA-ensuring system-level protection without signal glitches or supply sequencing dependencies.

Key Specifications

Pinout & Package

MAX4533EWP is housed in a 20-pin Wide SO (SOIC-W) package with 0.300" body width and standard 0.050" pitch. Pin 15 is NC (not internally connected); all digital inputs (IN1–IN4) are referenced to GND, while analog terminals (NO_, NC_, COM_) interface directly with V+ and V− supplies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4533CWP, the MAX4533EWP extends operational reliability to -40°C to +85°C without performance trade-offs. Against ADG5412BRUZ, it offers lower on-resistance and pin compatibility with legacy MAX333 designs-reducing redesign effort while maintaining fault coverage for most industrial use cases.

Availability

MAX4533EWP is available at Aetrix Electronics and suitable for test equipment, industrial process control, and avionics systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4533EWP 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 industrial, communications, and computing applications.

The MAX4533EWP belongs to Maxim's fault-protected analog switch product line, engineered specifically for mission-critical signal routing where overvoltage resilience, rail-to-rail fidelity, and guaranteed fail-safe behavior are non-negotiable.

FAQ

What is the maximum fault voltage the MAX4533EWP can withstand with power applied?

The MAX4533EWP withstands ±25V overvoltage on NO_/NC_ terminals when power is applied (V+ and V− active). This rating applies with ±15V supplies; exceeding ±25V risks permanent damage. The device also supports ±40V fault tolerance when fully unpowered - a key safety feature for maintenance or hot-swap scenarios. MAX4533EWP's internal clamp circuitry activates within 20ns to limit COM_ output to the nearest supply rail.

Does the MAX4533EWP require power-supply sequencing during startup or shutdown?

No, the MAX4533EWP does not require power-supply sequencing. Its architecture allows V+ and V− to be ramped in any order or at different rates without causing latch-up, undefined states, or damage. During power-down, all switches default to high-impedance off-state automatically. This eliminates external sequencing circuitry and simplifies system design - a verified behavior confirmed across all operating conditions in the MAX4533EWP datasheet.

How does the MAX4533EWP handle rail-to-rail analog signals?

The MAX4533EWP uses parallel N-channel and P-channel MOSFETs per switch path, enabling true bidirectional conduction from V− to V+ without signal clipping or increased distortion near the rails. Unlike traditional series-FET switches, this topology maintains low and flat on-resistance (≤175Ω) across the full analog range. MAX4533EWP achieves this while preserving fault protection - a combination validated in its typical operating characteristics curves for R_ON vs. V_COM.

What is the on-resistance matching between channels in the MAX4533EWP?

The MAX4533EWP guarantees ≤10Ω maximum on-resistance mismatch (∆R_ON) between any two SPDT channels under identical conditions (e.g., V+ = +15V, V− = −15V, T_A = +25°C). This tight matching ensures consistent gain and phase response across multiplexed channels - essential for differential measurements and synchronized sampling. The specification is tested and guaranteed across the full −40°C to +85°C temperature range for MAX4533EWP.

Is the MAX4533EWP pin-compatible with older industry-standard switches?

Yes, the MAX4533EWP is explicitly pin-compatible with the MAX333 and MAX333A - industry-standard quad SPDT analog switches. Its 20-pin Wide SO footprint, identical pin functions (IN/NO/NC/COM/V+/V−/GND/NC), and compatible logic thresholds allow direct replacement without PCB modification. This backward compatibility is documented in the MAX4533EWP datasheet's General Description and Ordering Information sections.