Analog Devices Inc./Maxim Integrated MAX322ESA+T

Overview

The MAX322ESA+T from Maxim Integrated is a precision dual-supply SPST analog switch featuring one normally open (NO) and one normally closed (NC) channel, designed for ±3V to ±8V bipolar operation. It delivers 35Ω max on-resistance, <5pC charge injection, and guaranteed break-before-make switching-enabling high-fidelity signal routing in ±5V DAC/ADC interfaces and battery-powered test equipment.

For engineers reviewing the MAX322ESA+T datasheet, MAX322ESA+T pinout, MAX322ESA+T application, or MAX322ESA+T equivalent, this device is selected for low-leakage (<100pA), fast-switching (tON <150ns), and rail-to-rail analog signal handling in precision instrumentation where channel matching (<2Ω RON delta) and ESD robustness (>2000V) are critical.

Technical Context

The MAX322ESA+T implements complementary MOSFET pairs per switch with matched threshold voltages to achieve <2Ω on-resistance matching and <4Ω flatness across ±3V to ±8V supplies. Its break-before-make timing (2–5ns delay) prevents momentary shorting between NO and NC paths during logic transitions.

Internal clamping diodes protect IN_, COM_, NO_, and NC_ pins against overvoltage up to (V− − 0.3V) and (V+ + 0.3V); continuous current is limited to 30mA per terminal, with 100mA peak pulsed capability. Logic thresholds scale with V+ (VIH ≈ V+ − 1.5V, VIL ≈ V+ − 2.5V), supporting direct interfacing to microcontroller GPIOs.

Key Specifications

Pinout & Package

MAX322ESA+T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, with standard 1.27mm pitch and exposed pad not connected. Pin 1 is marked by a beveled corner or dot; pin numbering follows counterclockwise convention from top-left when viewed from component side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1422BRMZ and TS5A23157DGSR, the MAX322ESA+T uniquely supports true bipolar ±3V–±8V operation with guaranteed break-before-make, making it the only option among the three for precision ±5V instrumentation without external level shifters or timing compensation.

Availability

MAX322ESA+T is available at Aetrix Electronics and suitable for battery-operated test equipment, ±5V DAC/ADC interfaces, heads-up display systems, military radio audio routing, and precision sample-and-hold circuits requiring stable component supply across industrial temperature ranges.

Supply support for MAX322ESA+T 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, communications, and computing applications.

The MAX320/MAX321/MAX322 family was engineered specifically for precision analog signal routing in dual-supply systems-emphasizing low leakage, matched RON, and rail-to-rail signal integrity without external biasing.

FAQ

What is the maximum supply voltage range supported by the MAX322ESA+T?

The MAX322ESA+T operates from ±3V to ±8V dual supplies, with absolute maximum ratings specifying V+ up to (V− − 0.3V) and (V+ + 0.3V). The total supply voltage (V+ to V−) must not exceed 17V. This range allows direct use in legacy ±5V systems and extended industrial rails without external regulators or level shifters, and the MAX322ESA+T maintains specified RON, leakage, and switching performance across the full range.

Does the MAX322ESA+T support bidirectional analog signal flow?

Yes, the MAX322ESA+T supports fully bidirectional analog signal routing on all terminals (NO1, NC1, COM1, NO2, NC2, COM2). Each switch functions identically regardless of signal direction, enabling flexible PCB layout and reuse of the same device for input or output signal selection. This bidirectionality is intrinsic to its CMOS transmission-gate architecture and is verified across the full ±3V to ±8V analog signal range, and the MAX322ESA+T datasheet confirms no polarity dependence in RON or leakage specifications.

Is break-before-make timing guaranteed for the MAX322ESA+T?

Yes, break-before-make timing is a guaranteed specification for the MAX322ESA+T, with a minimum delay of 2ns and typical value of 3.5ns between NC opening and NO closing during logic transitions. This is explicitly documented in the Electrical Characteristics table and validated across temperature and supply variations. Unlike the MAX320 and MAX321 variants, only the MAX322ESA+T provides this guarantee, making it essential for fault-tolerant signal routing where momentary shorts must be avoided, and the MAX322ESA+T truth table and timing diagrams confirm the sequence.

What is the leakage current performance of the MAX322ESA+T at elevated temperature?

The MAX322ESA+T guarantees COM on-leakage current <2.5nA and NO/NC off-leakage <100pA at +85°C, with typical values remaining below 500pA. These figures are 100% tested at maximum rated hot temperature and correlated at +25°C per Note 6 in the datasheet. Such low, temperature-stable leakage ensures minimal error in high-impedance applications like piezoelectric sensor conditioning or battery voltage monitoring, and the MAX322ESA+T maintains this performance across its full −40°C to +85°C operating range.

Can the MAX322ESA+T be used with single-supply systems?

No, the MAX322ESA+T requires true dual supplies (V+ and V−) and is not specified for single-supply operation. Its internal architecture, logic thresholds, and absolute maximum ratings assume symmetric or asymmetric bipolar rails. For single-supply alternatives, Maxim recommends the MAX323/MAX324/MAX325 series, which share functional similarity but differ in supply architecture, pinout, and timing. Using the MAX322ESA+T with only V+ and GND will result in undefined behavior, excessive leakage, or damage, and the MAX322ESA+T datasheet explicitly excludes single-supply use cases.