Analog Devices Inc./Maxim Integrated MAX4533CAP+

Overview

MAX4533CAP+ from Maxim Integrated is a quad SPDT analog switch with rail-to-rail signal handling, ±25V fault protection (power on) and ±40V (power off), 175Ω max on-resistance at ±15V, and TTL/CMOS-compatible logic inputs - designed for high-reliability signal routing in test equipment and industrial data-acquisition systems where overvoltage transients are common.

For engineers reviewing the MAX4533CAP+ datasheet, MAX4533CAP+ pinout, MAX4533CAP+ application, or MAX4533CAP+ equivalent, key selection criteria include fault-protection voltage limits, COM_/NO_/NC_ terminal behavior during overvoltage, on-resistance matching across channels, break-before-make timing, and compatibility with dual (±4.5V to ±18V) or single (+9V to +36V) supply configurations.

Technical Context

The MAX4533CAP+ employs parallel N- and P-channel MOSFETs per switch channel with dedicated voltage-sensing circuitry that detects overvoltage on NO_ or NC_ terminals relative to V+ or V−. When fault thresholds are exceeded (±150mV beyond rails), internal drivers force the switch FETs off and clamp COM_ to the appropriate supply rail via dedicated clamp transistors (N2/P2).

This architecture enables bidirectional rail-to-rail analog conduction under normal operation while delivering sub-20ns fault response time and 2.5µs typical recovery after positive overvoltage events - all without requiring power-supply sequencing or external protection components.

Key Specifications

Pinout & Package

MAX4533CAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, rated for 0°C to +70°C operation. The package provides thermal and mechanical stability for automated PCB assembly in industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4532CAP+, the MAX4533CAP+ delivers double channel count in the same SSOP footprint; versus ADG1434BRUZ, it trades lower on-resistance for superior fault resilience - especially critical in unattended industrial or aerospace deployments where power-off overvoltage risk is non-negligible.

Availability

MAX4533CAP+ is available at Aetrix Electronics and suitable for redundant/backup systems, portable instrumentation, and industrial data-acquisition applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

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, automotive, and communications markets.

The MAX4533CAP+ belongs to Maxim's fault-protected analog switch product line, engineered specifically for mission-critical signal routing where transient immunity, rail-to-rail operation, and predictable fail-safe behavior are mandatory design requirements.

FAQ

What is the maximum allowable overvoltage on NO_ or NC_ pins of the MAX4533CAP+ when power is applied?

The MAX4533CAP+ supports ±25V overvoltage on NO_ or NC_ pins with power applied (V+ and V− active), provided supplies are ±15V. Exceeding this limit - even briefly - risks permanent device damage. This rating scales with supply voltage: at ±12V supplies, the safe fault range is ±22V. Always verify actual system rail voltages before deployment. The MAX4533CAP+ datasheet specifies these limits in Absolute Maximum Ratings Table 1.

Does the MAX4533CAP+ require external pull-up or pull-down resistors on its IN_ control inputs?

No, the MAX4533CAP+ does not require external pull-up or pull-down resistors on IN1–IN4. Its digital inputs have defined TTL/CMOS-compatible thresholds (+0.8V low, +2.4V high) and draw only ±5µA at logic high/low states. Driving IN_ directly from microcontroller GPIO or logic gates is sufficient. However, in noisy environments, local RC filtering (e.g., 100Ω series + 100pF to GND) may improve noise immunity without affecting switching speed. This behavior is confirmed in Electrical Characteristics Table 3.

Can the MAX4533CAP+ operate with asymmetrical dual supplies, such as +12V and −5V?

Yes, the MAX4533CAP+ supports asymmetrical dual supplies as long as the absolute difference between V+ and V− does not exceed +44V and each supply remains within its respective absolute maximum rating (V+ ≤ +44V, V− ≥ −44V). For example, +12V and −5V yields a 17V differential - well within spec. On-resistance and fault protection remain functional, though rail-to-rail signal range becomes 0V to +12V on the positive side and 0V to −5V on the negative side. This capability is documented in the Power-Supply Range specification.

What happens to the COM_ output during an overvoltage fault on a NO_ pin of the MAX4533CAP+?

During an overvoltage fault on a NO_ pin, the MAX4533CAP+ immediately disconnects the NO_–COM_ path and clamps the COM_ output to the appropriate supply rail: to V+ if the fault is positive (>V+ +150mV), or to V− if negative (

Is the MAX4533CAP+ pin-compatible with the MAX333A, and are there any layout considerations when substituting?

Yes, the MAX4533CAP+ is explicitly pin-compatible with the industry-standard MAX333 and MAX333A, sharing identical 20-pin SSOP pinout and function mapping. No PCB changes are required for direct substitution. However, the MAX4533CAP+ offers enhanced fault protection (±25V vs. ±15V for MAX333A) and lower on-resistance (175Ω vs. 350Ω), so existing layouts benefit immediately from improved robustness and signal fidelity without redesign. This compatibility is stated in the General Description section of the MAX4533CAP+ datasheet.