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 ±40V protection with power off. It features 175Ω max on-resistance, 0.5nA max off-leakage at +25°C, and operates from ±4.5V to ±18V dual supplies or +9V to +36V single supply. It is used in test equipment, data-acquisition systems, and industrial control where overvoltage resilience and signal integrity are critical.

For engineers reviewing the MAX4533EWP+ datasheet, MAX4533EWP+ pinout, MAX4533EWP+ application, or MAX4533EWP+ equivalent, key selection criteria include fault-protection voltage limits under powered/off conditions, rail-to-rail analog range, channel-to-channel on-resistance matching (≤10Ω), break-before-make timing (≤20ns), and TTL/CMOS-compatible logic thresholds across supply configurations.

Technical Context

The MAX4533EWP+ uses parallel N-channel and P-channel MOSFETs per SPDT channel, enabling low on-resistance while supporting bidirectional rail-to-rail analog signals between COM_ and NO_/NC_. Internal voltage sensors monitor NO_/NC_ against V+ and V−, triggering fast clamping (20ns typical fault response) and high-impedance isolation during overvoltage events.

During fault conditions, COM_ is actively clamped to the appropriate supply rail via dedicated clamp transistors (N2/P2), delivering up to ±10mA load current without transition glitches. All four channels operate independently, with no power-supply sequencing required-enabling robust hot-swap and redundant system integration.

Key Specifications

Pinout & Package

MAX4533EWP+ is housed in a 20-pin Wide SO (SOIC-W) package with 0.300-inch body width and standard gull-wing leads. The package supports surface-mount reflow and meets JEDEC MS-013AC mechanical specifications.

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, enabling cold-start capability in outdoor industrial and avionics deployments; compared with ADG5412BRUZ, it eliminates external biasing components while retaining robust fault tolerance-reducing design risk and validation effort.

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 high-reliability fault protection.

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 precision analog, mixed-signal, and power-management ICs for demanding industrial, communications, and aerospace applications.

The MAX4533EWP+ belongs to Maxim's fault-protected analog switch product line, engineered specifically for systems where signal integrity must be preserved despite exposure to unpredictable overvoltage events in real-world field environments.

FAQ

What is the maximum allowable fault voltage on NO_/NC_ pins of the MAX4533EWP+ when power is applied?

The MAX4533EWP+ supports ±25V fault voltage on NO_ and NC_ pins with power applied (V+ and V− active). This rating applies across the full −40°C to +85°C operating range and is validated per Absolute Maximum Ratings table. Exceeding ±25V under powered conditions risks permanent device damage, even for transient events.

Does the MAX4533EWP+ require external components to achieve rail-to-rail analog signal handling?

No. The MAX4533EWP+ achieves true rail-to-rail signal handling (V− to V+) on NO_, NC_, and COM_ terminals without external components. Its internal parallel N/P-channel FET architecture and integrated level-shifting drivers eliminate the need for charge pumps or auxiliary supplies-unlike many competing fault-protected switches.

How does the MAX4533EWP+ behave during power-down, and what protection remains active?

When V+ and V− are at 0V, the MAX4533EWP+ enters a fully disabled state: all switches turn off, NO_/NC_ terminals become high-impedance, and ±40V fault protection remains active. Leakage current stays below 10nA, and COM_ outputs float safely-ensuring no backdrive or latch-up in unpowered subsystems.

Is the MAX4533EWP+ pin-compatible with the MAX333A, and are there any layout considerations?

Yes, the MAX4533EWP+ is pin-compatible with the industry-standard MAX333 and MAX333A in the 20-pin Wide SO package. However, due to higher fault-protection energy handling, ensure adequate copper pour and thermal relief on V+ and V− pads, and avoid routing NO_/NC_ traces near noisy digital lines to preserve 62dB off-isolation.

What is the typical fault recovery time for the MAX4533EWP+ after an overvoltage event subsides?

After a fault condition ends, the MAX4533EWP+ recovers in 1.3µs for negative faults and 2.5µs for positive faults-measured from fault removal to full analog conduction resumption. Recovery time depends on COM_ load resistance and capacitance but is independent of fault amplitude, as confirmed in Typical Operating Characteristics Figure 13.