Analog Devices Inc./Maxim Integrated MAX4533CAP

Overview

The MAX4533CAP 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 features TTL/CMOS-compatible logic inputs, 20-pin SSOP packaging, and operates across dual ±4.5V to ±18V or single +9V to +36V supplies-used in test equipment, data-acquisition systems, and industrial control where overvoltage resilience is critical.

For engineers reviewing the MAX4533CAP datasheet, MAX4533CAP pinout, MAX4533CAP application, or MAX4533CAP equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts for redundant systems, portable instrumentation, and fault-critical analog routing.

Technical Context

The MAX4533CAP uses parallel N-channel and P-channel MOSFETs per SPDT channel, enabling low on-resistance (175Ω max) and true rail-to-rail analog conduction between COM_, NO_, and NC_ terminals. Its internal voltage-sensing comparators monitor NO_/NC_ against V+ and V−, triggering fast fault response (20ns typ) and clamping COM_ to the appropriate supply rail during overvoltage.

Fault protection operates at ±25V with power applied (±15V supplies) and extends to ±40V with power off. All four channels are independently controlled via logic-level IN1–IN4 inputs, each with +0.8V/+2.4V thresholds ensuring compatibility with TTL and CMOS drivers under both dual and single-supply operation.

Key Specifications

Pinout & Package

MAX4533CAP is housed in a 20-pin shrink small-outline package (SSOP), 0.150" wide, with gull-wing leads and standard JEDEC MO-153 footprint. Pin 1 is marked by a beveled corner; pin 15 is No Connect (N.C.).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4533CWP and ADG5412BRUZ, the MAX4533CAP offers optimal balance of commercial-temperature performance, SSOP footprint efficiency, and direct MAX333A upgrade path-making it ideal for cost-sensitive, space-constrained test and instrumentation designs.

Availability

MAX4533CAP is available at Aetrix Electronics and suitable for test equipment, portable instruments, and industrial process control applications requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.

Supply support for MAX4533CAP 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX4533CAP belongs to Maxim's fault-protected analog switch product line, engineered specifically for systems where accidental overvoltage exposure must not compromise signal integrity or cause system failure.

FAQ

What is the maximum fault voltage the MAX4533CAP can withstand with power applied?

The MAX4533CAP withstands ±25V fault voltages on NO_ or NC_ pins with power applied (e.g., ±15V supplies). This is specified in the Absolute Maximum Ratings table and confirmed in the Electrical Characteristics section under "Fault-Protected Analog Signal Range." Exceeding ±25V with power on risks permanent damage. The MAX4533CAP achieves this via internal sensing comparators and clamp circuitry that disconnect the switch and limit COM_ to V+ or V−.

Does the MAX4533CAP require power-supply sequencing during startup or shutdown?

No, the MAX4533CAP does not require power-supply sequencing. Its internal logic and switch drivers operate correctly regardless of V+ and V− ramp order or timing. This is explicitly stated in the Features list as "No Power-Supply Sequencing Required During Power-Up or Power-Down." The device remains functional and fault-protected across all valid supply combinations within ±4.5V to ±18V (dual) or +9V to +36V (single), making it robust for complex power architectures.

Can the MAX4533CAP operate from a single +12V supply?

Yes, the MAX4533CAP supports single-supply operation from +9V to +36V with V− tied to GND. At +12V, its on-resistance is 390Ω max (per Electrical Characteristics - Single Supply table), logic thresholds remain TTL/CMOS-compatible (+0.8V/+2.4V), and fault protection holds at ±25V with power on. The typical operating circuit on page 1 confirms this configuration, and Figure 2 shows test conditions using V+ = +12V and V− = 0V.

Is the MAX4533CAP pin-compatible with the MAX333A?

Yes, the MAX4533CAP is explicitly described as pin-compatible with the industry-standard MAX333 and MAX333A in the General Description. Pin mapping (IN, NO, COM, NC, V+, V−, GND, N.C.) matches identically across all 20 pins. This allows direct replacement in existing designs without PCB modification - a key advantage highlighted in both the Features list and Ordering Information section.

What happens to the COM_ output during an overvoltage fault on NO_ or NC_?

During an overvoltage fault, the MAX4533CAP's internal clamp circuitry (N2/P2 FETs) forces the COM_ terminal to the appropriate supply rail - V+ for positive overvoltage, V− for negative overvoltage - while simultaneously turning off the main switch (N1/P1). This occurs within 20ns (typ), limits COM_ to safe voltage levels, and provides up to ±10mA load current. The behavior is documented in the General Description, Features, and Figure 1's simplified internal structure.