Analog Devices Inc./Maxim Integrated MAX318CSA+

Overview

The MAX318CSA+ from Maxim Integrated is a precision CMOS single-pole single-throw (SPST) analog switch with normally open (NO) configuration, 35Ω maximum on-resistance, <10pC charge injection, and ±2000V ESD rating. It operates from ±4.5V to ±20V bipolar or +10V to +30V single supply, enabling rail-to-rail signal switching in high-fidelity sample-and-hold and test equipment circuits.

For engineers reviewing the MAX318CSA+ datasheet, MAX318CSA+ pinout, MAX318CSA+ application, or MAX318CSA+ equivalent, key selection criteria include guaranteed matched on-resistance (<2Ω), flat on-resistance over signal range (∆3Ω max), low leakage (<6nA at +85°C), TTL/CMOS logic compatibility, and SO-8 package suitability for space-constrained industrial control and communications systems.

Technical Context

The MAX318CSA+ implements a silicon-gate CMOS transmission gate architecture optimized for low distortion and minimal signal path perturbation. Its design guarantees matched channel resistance and flat R_ON across the full analog input range under bipolar supply operation, with charge injection tightly controlled to ≤10pC to preserve integrity in precision sampling.

It supports dual-supply operation (±4.5V to ±20V) and single-supply operation (+10V to +30V), with logic-level inputs referenced to VL and analog signals referenced independently to V+ and V−. The device features no internal connection on Pin 2 (N.C.), and uses Pin 8 as the COM terminal - distinct from the MAX317 (NC) and MAX319 (NO/NC) variants.

Key Specifications

Pinout & Package

MAX318CSA+ is housed in an 8-pin SO (Small Outline) package, 150-mil body width, with standard JEDEC MS-012AC footprint. Pin 1 is COM (common analog terminal); Pin 2 is N.C. (no internal connection); Pin 3 is GND (logic ground); Pin 4 is V+ (positive analog supply); Pin 5 is VL (logic supply); Pin 6 is IN (digital control input); Pin 7 is V− (negative analog supply); Pin 8 is NO (normally open analog terminal).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRMZ and TS5A23157DCUR, the MAX318CSA+ uniquely combines ±20V bipolar operation, guaranteed R_ON flatness (∆3Ω), and MIL-grade ESD robustness - making it the only option qualified for precision, high-reliability analog routing in extended-temperature military and aerospace systems.

Availability

MAX318CSA+ is available at Aetrix Electronics and suitable for sample-and-hold circuits, test equipment signal routing, and guidance and control systems requiring stable component supply across industrial, defense, and communications sectors.

Supply support for MAX318CSA+ 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 demanding industrial and aerospace applications.

The MAX317/MAX318/MAX319 family was designed specifically for precision analog signal routing in environments requiring low distortion, high reliability, and guaranteed parametric performance across temperature and supply variations.

FAQ

What is the maximum allowable supply voltage for MAX318CSA+?

The MAX318CSA+ has an absolute maximum V+ to V− rating of +44V. Operation beyond this voltage risks permanent damage. For reliable long-term use, bipolar supplies should stay within ±4.5V to ±20V, and single supplies within +10V to +30V. Exceeding these ranges reduces analog signal headroom and may increase leakage or timing uncertainty. Always observe proper power sequencing: V+ first, then VL, then V−, then logic inputs.

Does MAX318CSA+ support single-supply operation?

Yes, the MAX318CSA+ supports single-supply operation from +10V to +30V. In this mode, V− must be tied to ground (0V), and VL should be set to +5V for TTL compatibility or to V+ for CMOS logic levels. Analog signal range becomes 0V to V+, and on-resistance increases slightly versus bipolar operation - e.g., 40Ω typical at V+ = 12V. Guaranteed R_ON matching and flatness apply only under bipolar conditions.

What is the function of Pin 2 on MAX318CSA+?

Pin 2 on the MAX318CSA+ is labeled N.C. (No Connect) and is not internally bonded to any circuit node. It must remain unconnected on the PCB - neither grounded nor tied to any voltage. Leaving Pin 2 floating avoids unintended coupling into sensitive analog paths and prevents potential latch-up or ESD discharge paths that could compromise device reliability or signal integrity.

How does charge injection affect MAX318CSA+ performance in sample-and-hold applications?

Charge injection in the MAX318CSA+ is guaranteed ≤10pC, directly impacting hold-mode accuracy in sample-and-hold circuits. When the switch opens, injected charge displaces the hold capacitor voltage by ∆V = Q/C_HOLD; for a 10nF capacitor, this yields ≤1mV error. This specification enables stable 12-bit resolution in precision data acquisition systems without requiring additional correction circuitry or oversized hold capacitors.

Is MAX318CSA+ pin-compatible with other devices in the MAX317/MAX318/MAX319 family?

No - MAX318CSA+ is not pin-compatible with MAX317 or MAX319. While all three share the same 8-pin SO package and Pin 1–7 assignments, Pin 8 differs: MAX318 uses NO, MAX317 uses COM, and MAX319 uses COM (with Pin 2 = NC and Pin 8 = NO). Swapping them without board revision causes functional failure. Each variant serves a distinct topology (SPST-NO, SPST-NC, SPDT), and their truth tables and terminal roles are mutually exclusive.