Analog Devices Inc./Maxim Integrated MAX333ACUP

Overview

MAX333ACUP from Maxim Integrated is a precision quad SPDT CMOS analog switch operating on bipolar supplies (±4.5V to ±20V) or single-ended supplies (+10V to +30V), featuring <35Ω on-resistance, <2Ω channel-to-channel match, <10pC charge injection, 175ns turn-on time, and rail-to-rail analog signal handling-ideal for test equipment and portable instrumentation requiring low leakage and high channel matching.

For engineers reviewing the MAX333ACUP datasheet, MAX333ACUP pinout, MAX333ACUP application, or MAX333ACUP equivalent, this page delivers verified electrical specs, TSSOP-20 package details, real-world use cases in communications and heads-up displays, and two validated alternative parts with documented functional and parametric differences.

Technical Context

The MAX333ACUP implements four independent SPDT switches using silicon-gate CMOS technology, supporting break-before-make switching (10ns typical) and TTL/CMOS-compatible logic inputs (0.8V–2.4V threshold, supply-independent). Its architecture guarantees flat on-resistance (∆3Ω max) over full analog signal range and maintains sub-6nA off-channel leakage at +85°C.

It operates across dual-supply (±4.5V to ±20V) and single-supply (+10V to +30V) configurations, with ESD robustness >2000V (HBM), quiescent current <50µA, and rail-to-rail analog voltage handling from V− to V+, enabling direct interfacing with op-amps, ADCs, and DACs without level-shifting.

Key Specifications

Pinout & Package

MAX333ACUP is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, 6.5mm × 4.4mm body, and exposed pad for thermal enhancement. Pin 6 is GND; pins 5 and 16 are V− and V+ respectively; pins 1,10,11,20 are logic inputs (IN1–IN4); pins 2,9,12,19 are normally open terminals (NO1–NO4); pins 3,8,13,18 are common poles (COM1–COM4); pins 4,7,14,17 are normally closed terminals (NC1–NC4); pin 15 is not internally connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG403BRZ and TS5A3157DCKR, the MAX333ACUP uniquely combines ±20V bipolar operation, <2Ω channel matching, and <10pC charge injection-making it the only option among the three qualified for precision test equipment and high-voltage telecom signal routing.

Availability

MAX333ACUP is available at Aetrix Electronics and suitable for test equipment, communications infrastructure, heads-up displays, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed performance across industrial temperature ranges.

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) designs high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX333A product line delivers precision analog switching solutions optimized for applications demanding low charge injection, tight channel matching, and wide supply voltage flexibility-including automated test systems and rugged portable instrumentation.

FAQ

What is the maximum analog signal voltage range supported by the MAX333ACUP?

The MAX333ACUP supports analog signals from V− to V+, with absolute maximum ratings allowing V+ to V− up to 44V. Under bipolar operation (e.g., V+ = +15V, V− = −15V), the full range is −15V to +15V. In single-supply mode (V− = GND), it handles 0V to V+, up to +30V. This rail-to-rail capability ensures compatibility with standard op-amp outputs and sensor interfaces without external level shifting. The MAX333ACUP maintains specified leakage and on-resistance across this entire range.

Does the MAX333ACUP require external pull-up or pull-down resistors on its logic inputs?

No, the MAX333ACUP does not require external pull-up or pull-down resistors on its logic inputs (pins 1, 10, 11, 20). Its TTL/CMOS-compatible inputs are guaranteed to operate correctly with logic-high voltages ≥2.4V and logic-low voltages ≤0.8V across the full supply range, and input current is bounded at ±1.0µA. Internal input structure ensures stable switching without external biasing, simplifying microcontroller interface design. This behavior is confirmed in the MAX333ACUP datasheet's Electrical Characteristics table under "Input Voltage Low" and "Input Voltage High" parameters.

Can the MAX333ACUP be used with unbalanced supplies such as +24V and −5V?

Yes, the MAX333ACUP supports unbalanced supplies including +24V and −5V, as explicitly stated in the Applications Information section. The device requires only that the total supply differential (V+ − V−) remain within 44V and that each supply stay within Absolute Maximum Ratings (V+ ≤ +30V, V− ≥ −30V). With +24V/−5V, the analog signal range becomes −5V to +24V. Switching performance and leakage remain within spec, though on-resistance increases slightly versus symmetric ±15V. This flexibility makes the MAX333ACUP suitable for legacy industrial systems with nonstandard rails.

What is the thermal performance of the MAX333ACUP in TSSOP-20 package at +70°C ambient?

The MAX333ACUP in TSSOP-20 has a thermal derating factor of 7mW/°C above +70°C, with a maximum continuous power dissipation of 559mW at TA = +70°C. At +70°C ambient and typical operating conditions (e.g., V+ = +15V, V− = −15V, all switches active), total supply current remains below 0.3mA, resulting in <9mW static power-well within thermal limits. PCB layout with adequate copper pour under the exposed pad further enhances heat dissipation. This margin ensures reliable operation in enclosed portable instrument enclosures without forced airflow.

How does the MAX333ACUP handle power-supply sequencing, and what protection is recommended?

The MAX333ACUP recommends powering V+ first, followed by V−, then logic inputs to avoid latch-up or overstress. If strict sequencing isn't feasible, two small-signal diodes (e.g., 1N4148) in series with V+ and V− pins provide overvoltage protection, reducing analog signal range by 1V but preserving on-resistance and leakage specs. This method is validated in Figure 1 of the MAX333ACUP datasheet and prevents damage from back-powering or transient surges. No additional external components are needed for normal sequenced operation.