Analog Devices Inc./Maxim Integrated MAX322ESA+

Overview

MAX322ESA+ from Maxim Integrated is a precision dual-supply SPST analog switch with one normally open (NO) and one normally closed (NC) channel, designed for ±3V to ±8V operation. It delivers 35Ω max on-resistance, <5pC charge injection, guaranteed break-before-make timing (2–5ns), and 100pA max off-leakage - enabling high-fidelity signal routing in ±5V DAC/ADC interfaces and battery-powered test equipment.

For engineers reviewing the MAX322ESA+ datasheet, MAX322ESA+ pinout, MAX322ESA+ application, or MAX322ESA+ equivalent, key selection criteria include bipolar supply compatibility, sub-150ns switching, low R_ON flatness (<4Ω), and ESD robustness (>2000V per Method 3015.7) in an 8-pin SO package rated for -40°C to +85°C.

Technical Context

The MAX322ESA+ integrates two independent CMOS SPST switches sharing dual ±V supplies, with complementary logic control: IN1 drives NO1/NC1, IN2 drives NO2/NC2. Its break-before-make architecture prevents momentary shorting during channel transitions - critical for analog multiplexing where signal integrity must be preserved across switching events.

It operates bidirectionally across the full analog range (V− to V+), maintains <2Ω R_ON matching between channels, and exhibits minimal R_ON variation (<4Ω flatness) over ±3V input swing - ensuring consistent gain and linearity in precision instrumentation front-ends and audio routing paths.

Key Specifications

Pinout & Package

MAX322ESA+ is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant, rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX322EPA+, MAX322ESA+ offers identical performance in a smaller SO package ideal for volume SMT assembly; versus ADG1422BRMZ, it provides native bipolar support and guaranteed break-before-make - essential for ±5V instrumentation where supply sequencing and signal integrity are non-negotiable.

Availability

MAX322ESA+ is available at Aetrix Electronics and suitable for battery-operated systems, precision data acquisition, and military radio subsystems requiring stable component supply across extended temperature ranges.

Supply support for MAX322ESA+ 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX320/MAX321/MAX322 family was engineered for precision analog signal routing in dual-supply environments - targeting applications demanding low distortion, minimal charge injection, and guaranteed switching behavior without external timing control.

FAQ

What is the maximum allowable supply voltage range for MAX322ESA+?

The MAX322ESA+ supports dual-supply operation from ±3V to ±8V, with the absolute maximum V+ to V− differential limited to 17V. Exceeding ±8V or the 17V total differential risks permanent damage. For reliable operation in ±5V systems - the most common use case - the MAX322ESA+ delivers specified R_ON, leakage, and switching performance without derating.

Does MAX322ESA+ require power-supply sequencing, and why?

Yes - MAX322ESA+ requires V+ to be applied before V−, and both supplies must be stable before applying analog signals or logic inputs. This sequencing prevents latch-up and ensures proper internal biasing. Failure to follow this order - especially with uncurrent-limited signals - may cause excessive current flow or temporary malfunction. The MAX322ESA+ datasheet recommends external diodes (Figure 1) if strict sequencing cannot be guaranteed.

What does "guaranteed break-before-make" mean for MAX322ESA+?

For MAX322ESA+, guaranteed break-before-make means the NC channel fully opens before the NO channel closes during logic transitions - with a minimum delay of 2ns and maximum of 5ns. This prevents momentary short-circuits between NO and NC terminals, which is essential in applications like multiplexed sensor interfaces or calibration paths where signal integrity must be preserved across switching events.

Can MAX322ESA+ operate with unipolar supplies such as +5V and GND?

No - MAX322ESA+ is designed exclusively for true dual-supply operation (e.g., +5V and −5V). It does not support unipolar configurations like +5V/GND. For single-supply alternatives, Maxim specifies the MAX323/MAX324/MAX325 family. Attempting to tie V− to GND or operate outside the ±3V to ±8V range violates absolute maximum ratings and may result in parametric failure or device damage.

How is charge injection specified for MAX322ESA+, and why does it matter?

MAX322ESA+ guarantees ≤5pC maximum charge injection - measured as the net charge transferred to the COM pin during switching, using a 1nF load and zero-source impedance (Figure 4). This parameter directly impacts settling time and accuracy in sample-and-hold circuits and high-resolution ADC/DAC interfaces; low charge injection minimizes voltage glitches that would otherwise corrupt held values or introduce harmonic distortion.