Analog Devices Inc./Maxim Integrated MAX317CSA

Overview

MAX317CSA from Maxim Integrated is a precision CMOS single-pole single-throw (SPST) analog switch with normally closed (NC) configuration, 35Ω maximum on-resistance, <10pC charge injection, and ±44V breakdown voltage. It operates from bipolar supplies (±4.5V to ±20V) or single supply (+10V to +30V), enabling rail-to-rail signal switching in sample-and-hold circuits and military radios.

For engineers reviewing the MAX317CSA datasheet, MAX317CSA pinout, MAX317CSA application, or MAX317CSA equivalent, key selection criteria include guaranteed on-resistance matching (<2Ω), low leakage (<6nA at +85°C), fast switching (t_ON < 175ns), and SO-8 package compatibility with industrial temperature range (0°C to +70°C).

Technical Context

The MAX317CSA implements a silicon-gate CMOS architecture optimized for low distortion analog signal routing. Its NC topology ensures default conduction path closure without logic input activation, while matched on-resistance across channels enables precision differential signal handling in guidance systems.

Guaranteed flat on-resistance (∆3Ω max over full analog range) and sub-10pC charge injection support high-fidelity sampling in test equipment and heads-up displays. ESD robustness (>±2000V) and dual-supply flexibility (±4.5V to ±20V or +10V to +30V) allow deployment in harsh environments including PBX infrastructure and battery-powered communications systems.

Key Specifications

Pinout & Package

MAX317CSA is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, 150-mil body width, 1.27mm lead pitch, and gull-wing terminations suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX317CSA, ADG1419BRMZ offers lower on-resistance but requires redesign to implement NC functionality, while TS5A23157DGSR enables compact low-voltage layouts but cannot replace MAX317CSA in bipolar-supply military or industrial systems due to fundamental supply architecture mismatch.

Availability

MAX317CSA is available at Aetrix Electronics and suitable for sample-and-hold circuits, guidance and control systems, and military radios requiring stable component supply across extended production lifecycles.

Supply support for MAX317CSA 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, automotive, and communications applications.

The MAX317CSA belongs to Maxim's precision CMOS analog switch family engineered for low-distortion, high-reliability signal routing in mission-critical systems where leakage, charge injection, and supply flexibility directly impact system accuracy.

FAQ

What is the maximum allowable analog signal voltage range for MAX317CSA?

The MAX317CSA supports analog signal voltages from V− to V+, with absolute maximum ratings of −2V to V+ + 2V on COM, NC, and NO terminals. With ±15V supplies, it handles ±15V signals; with +30V single supply and V− tied to GND, it supports 0V to +30V. The 44V maximum breakdown voltage ensures margin against transients. Always observe the specified absolute maximum ratings to prevent permanent damage to the MAX317CSA.

Does MAX317CSA require separate logic and analog supplies?

Yes, MAX317CSA uses independent VL (logic supply) and V+/V− (analog supplies). VL accepts 5V for TTL compatibility or can be tied to V+ for CMOS logic levels. This separation allows clean digital control even when analog rails operate at high voltages like ±15V. The MAX317CSA datasheet specifies VL must remain within (GND − 0.3V) to (V+ + 0.3V); violating this risks latch-up or damage to the MAX317CSA.

How does the normally closed (NC) behavior of MAX317CSA function electrically?

The MAX317CSA conducts between COM and NC pins when the IN pin is logic low (≤0.8V), and opens that path when IN is logic high (≥2.4V). This default-closed behavior provides fail-safe signal continuity during power-up, reset, or control-line faults. Unlike MAX318 (NO) or MAX319 (SPDT), the MAX317CSA's NC architecture eliminates need for pull-down resistors or external biasing to ensure default conduction - a key reliability feature in guidance and military radio applications.

Can MAX317CSA operate from a single +12V supply?

Yes, MAX317CSA supports single-supply operation from +10V to +30V. For +12V use, connect V− to GND, set VL to +5V (for TTL compatibility) or +12V (for CMOS), and ensure IN logic levels comply with VL. Note that on-resistance increases slightly versus bipolar operation (e.g., 40–100Ω typical at V+ = 12V), and guaranteed parameters like on-resistance match and flatness apply only under bipolar conditions per the MAX317CSA datasheet.

What is the thermal performance of MAX317CSA in SO-8 package at +70°C ambient?

In SO-8 package, MAX317CSA has a thermal resistance θ_JA of 170°C/W and a maximum continuous power dissipation of 471mW at +70°C ambient (derating 5.88mW/°C above). At full rated load, junction temperature rise is ~79°C, resulting in ~149°C junction temp - within its 150°C storage limit but approaching operational limits. For sustained high-current use, heatsinking or derating is recommended. This thermal profile is validated for the MAX317CSA variant specifically, not generic SO-8 assumptions.