Analog Devices Inc./Maxim Integrated MAX333ACUP+

Overview

MAX333ACUP+ from Maxim Integrated is a precision quad SPDT CMOS analog switch designed for high-fidelity signal routing in test equipment and portable instrumentation. It operates from ±4.5V to ±20V bipolar or +10V to +30V single supply, delivers <35Ω on-resistance with <2Ω channel matching and <3Ω flatness, and features 10pC charge injection and rail-to-rail analog signal handling up to ±15.5V.

For engineers reviewing the MAX333ACUP+ datasheet, MAX333ACUP+ pinout, MAX333ACUP+ application, or MAX333ACUP+ equivalent, key selection criteria include guaranteed on-resistance matching across temperature, break-before-make timing (10ns typ), low leakage (<6nA at +85°C), and TTL/CMOS-compatible logic inputs independent of supply voltage.

Technical Context

The MAX333ACUP+ integrates four independent SPDT switches using Maxim's silicon-gate CMOS process, enabling precise analog signal switching without distortion. Its architecture guarantees matched on-resistance between channels (<2Ω) and flat on-resistance over full signal range (∆3Ω max), critical for multiplexer accuracy in data acquisition systems.

It supports dual-supply operation (±4.5V to ±20V) and single-supply mode (+10V to +30V), with logic inputs functional from +0.8V to +2.4V regardless of supply level. Break-before-make switching prevents signal shorting during transitions, and rail-to-rail analog handling allows VCOM, VNO, and VNC to swing from V− to V+ without damage.

Key Specifications

Pinout & Package

MAX333ACUP+ is housed in a 20-pin TSSOP package (JEDEC MO-153, 6.5mm × 4.4mm, 0.65mm pitch), optimized for space-constrained portable and test equipment designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG408BRUZ and TS5A3157DCKR, the MAX333ACUP+ uniquely combines quad SPDT topology, bipolar supply support, guaranteed on-resistance matching, and sub-10pC charge injection-making it irreplaceable in precision multiplexed data acquisition where channel consistency and signal fidelity are non-negotiable.

Availability

MAX333ACUP+ is available at Aetrix Electronics and suitable for test equipment, communications infrastructure, avionics displays, and portable instrumentation requiring stable component supply across extended temperature and voltage operating conditions.

Supply support for MAX333ACUP+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX333A product line was engineered for precision analog signal routing in environments demanding low distortion, high channel consistency, and robust operation across wide supply and temperature ranges-targeting automated test, telecom, and portable measurement systems.

FAQ

What supply configurations does the MAX333ACUP+ support?

The MAX333ACUP+ supports both bipolar supplies (±4.5V to ±20V) and single-ended supplies (+10V to +30V). In single-supply mode, V− must be connected to GND. Logic inputs remain functional across the full supply range, with guaranteed TTL/CMOS compatibility (0.8V to 2.4V thresholds) independent of V+ or V− levels. This flexibility allows integration into legacy ±15V systems as well as modern +12V or +24V portable platforms.

Does the MAX333ACUP+ require external protection diodes for overvoltage?

No-external diodes are optional. The MAX333ACUP+ has absolute maximum ratings up to ±30V on V+ and V−, and analog terminals tolerate V− to V+ swing. However, if supply sequencing cannot be controlled (e.g., V− applied before V+), two small-signal diodes in series with V+ and V− pins (as shown in Maxim's Figure 1) prevent latch-up. This adds ~1.4V drop but preserves MAX333ACUP+'s low leakage and on-resistance performance.

How does the MAX333ACUP+ achieve guaranteed on-resistance matching?

The MAX333ACUP+ achieves <2Ω on-resistance matching between channels through Maxim's silicon-gate CMOS process and monolithic layout techniques that minimize process variation across the four switch cells. This matching is guaranteed only under bipolar-supply operation (e.g., ±15V), as confirmed in the datasheet Note 4. Matching is not specified for single-supply use, making MAX333ACUP+ ideal for applications like precision multiplexers where channel uniformity directly impacts measurement accuracy.

Can the MAX333ACUP+ handle signals beyond its supply rails?

No-the MAX333ACUP+ does not support overvoltage tolerant operation. Analog signals at COM, NO, or NC pins must remain strictly within the V− to V+ range at all times. Exceeding these limits-even momentarily-can cause irreversible damage. The device's rail-to-rail capability means it handles signals *up to* the rails, not beyond them. For overvoltage protection, external clamping or series resistors must be added upstream of MAX333ACUP+.

What is the thermal performance of the MAX333ACUP+ in TSSOP package?

In its 20-pin TSSOP package, the MAX333ACUP+ has a thermal derating factor of 7mW/°C above +70°C, with a maximum continuous power dissipation of 559mW at TA = +70°C. At full rated load (20mA per COM/NO/NC), self-heating remains minimal due to low on-resistance and quiescent current (<50µA). For high-density PCB layouts, ensure ≥25% copper pour under the exposed pad (if present) and avoid enclosing the device in sealed enclosures without airflow.