Analog Devices Inc./Maxim Integrated MAX320ESA+

Overview

The MAX320ESA+ from Maxim Integrated is a precision dual SPST analog switch with two normally open (NO) channels, designed for ±3V to ±8V dual-supply operation. It delivers 35Ω max on-resistance, 150ns max turn-on time, and 100pA max leakage at +25°C-enabling high-fidelity signal routing in battery-powered instrumentation and ±5V data converters.

For engineers reviewing the MAX320ESA+ datasheet, MAX320ESA+ pinout, MAX320ESA+ application, or MAX320ESA+ equivalent, key selection criteria include guaranteed charge injection ≤5pC, bipolar supply flexibility, low power consumption (<1.25mW), and ESD robustness (>2000V per Method 3015.7).

Technical Context

The MAX320ESA+ implements CMOS-based transmission-gate architecture with break-before-make logic excluded (only MAX322 supports it). Its channel matching (∆RON <2Ω) and flatness (R_FLAT(ON) <4Ω) ensure minimal gain error across ±3V to ±8V analog signal ranges.

Input thresholds scale with V+: VIH = V+ − 1.5V, VIL = V+ − 2.5V. All terminals tolerate signals from (V− − 0.3V) to (V+ + 0.3V), clamped by internal diodes-requiring external current limiting if analog inputs exceed ±30mA continuous.

Key Specifications

Pinout & Package

MAX320ESA+ uses an 8-pin SO (Small Outline) package with exposed pad not connected internally; dimensions comply with JEDEC MS-012AA. Pin 1 is top-left corner marked with dot or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1421BRMZ and TS5A23157DCUR, the MAX320ESA+ uniquely supports true bipolar ±3V–±8V operation with sub-5pC charge injection-making it irreplaceable in precision ±5V data acquisition and military-grade analog routing where supply headroom and glitch energy are constrained.

Availability

MAX320ESA+ is available at Aetrix Electronics and suitable for battery-operated instrumentation, ±5V DAC/ADC interfaces, and military radio front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX320ESA+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.

The MAX320ESA+ belongs to Maxim's precision analog switch product line, engineered specifically for low-leakage, low-distortion signal routing in dual-supply systems where R_ON matching and charge injection directly impact measurement accuracy.

FAQ

What is the maximum allowable supply voltage range for the MAX320ESA+?

The MAX320ESA+ operates from ±3V to ±8V dual supplies, with absolute maximum ratings specifying V+ up to (V− − 0.3V) and up to +17V total differential (V+ − V−). Exceeding ±8V risks parametric degradation; sustained operation above ±7.5V requires derating per thermal limits in the datasheet. The MAX320ESA+ must never see V+ or V− beyond these bounds even transiently without external clamping.

Does the MAX320ESA+ support bidirectional analog signal flow?

Yes, the MAX320ESA+ supports fully bidirectional signal routing on all COM, NO1, and NO2 pins. Its CMOS transmission-gate structure imposes no inherent directionality-voltage can be applied to any terminal with the same R_ON, leakage, and bandwidth performance. This enables flexible use in sample-and-hold circuits, audio mixing, and sensor interface multiplexing where signal source/sink roles change dynamically.

What is the guaranteed charge injection specification for MAX320ESA+ and why does it matter?

The MAX320ESA+ guarantees ≤5pC maximum charge injection, measured with CL = 1.0nF and RGEN = 0Ω. This parameter directly determines the voltage glitch induced on sampling capacitors: ∆V = Q/CL. At 5pC and 1nF, glitch is limited to 5mV-critical for 12-bit+ ADC accuracy in precision data acquisition. The MAX320ESA+ achieves this via matched transistor sizing and layout symmetry, verified across temperature and process corners.

Can the MAX320ESA+ be used with single-supply systems like +5V only?

No-the MAX320ESA+ requires true dual supplies (e.g., +5V and −5V) and is not rated for single-supply operation. Its internal circuitry relies on symmetric rail biasing for proper threshold generation and leakage control. For +5V-only systems, Maxim recommends the pin-compatible MAX323 series instead. Attempting to tie V− to ground on the MAX320ESA+ violates absolute maximum ratings and causes functional failure or permanent damage.

How does temperature affect leakage current in the MAX320ESA+?

The MAX320ESA+ guarantees <2.5nA maximum COM on-leakage and <100pA maximum off-leakage at +85°C ambient-verified per test condition in the datasheet. Leakage increases exponentially with temperature but remains tightly bounded: typical on-leakage is <100pA at +25°C and rises to ~1.2nA at +85°C. This behavior is characterized across the full −40°C to +85°C operating range, ensuring predictable performance in industrial and automotive environments where thermal stability is essential for the MAX320ESA+.