Analog Devices Inc./Maxim Integrated MAX317CPA

Overview

MAX317CPA from Maxim Integrated is a precision CMOS analog switch with normally closed (NC) configuration, designed for rail-to-rail signal routing in high-fidelity sample-and-hold and test equipment circuits. It delivers <35Ω maximum on-resistance, <2Ω channel-to-channel match, <10pC charge injection, and operates across ±4.5V to ±20V dual supplies or +10V to +30V single supply.

For engineers reviewing the MAX317CPA datasheet, MAX317CPA pinout, MAX317CPA application, or MAX317CPA equivalent, key selection criteria include guaranteed on-resistance flatness (∆3Ω max), sub-6nA off-leakage at +85°C, 175ns turn-on time, ESD tolerance >±2000V, and compatibility with TTL/CMOS logic levels.

Technical Context

The MAX317CPA implements a single-pole single-throw (SPST) normally closed analog switch using Maxim's silicon-gate CMOS process. Its internal architecture ensures matched conduction paths between channels and minimal voltage-dependent resistance variation across the full analog signal range (±15V typical).

It supports both bipolar and single-supply operation with independent logic supply (VL) referenced to GND, enabling TTL- or CMOS-level control while handling rail-to-rail analog signals up to ±15.5V. Charge injection is tightly controlled (<10pC) to preserve integrity in precision sampling applications.

Key Specifications

Pinout & Package

MAX317CPA is housed in an 8-pin plastic DIP package (0.300″ wide), compliant with JEDEC MS-001. Pin 1 is COM (common 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), and Pin 8 is NC (normally closed analog terminal).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRZ and TS5A23157DCUR, the MAX317CPA uniquely provides guaranteed NC behavior, bipolar supply flexibility, and leakage performance optimized for high-impedance hold circuits - making it irreplaceable in precision analog sampling where default closure and thermal stability are mandatory.

Availability

MAX317CPA is available at Aetrix Electronics and suitable for sample-and-hold circuits, guidance and control systems, and test equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX317CPA 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX317 series belongs to Maxim's precision analog switch product line, engineered specifically for applications demanding low charge injection, matched on-resistance, and robust rail-to-rail signal handling in harsh environments.

FAQ

What is the maximum allowable analog signal voltage range for MAX317CPA?

The MAX317CPA supports an analog signal range of ±15.5V when operated with ±16.5V supplies, limited by its absolute maximum ratings (V+ to V− ≤ +44V). This rail-to-rail capability allows direct interfacing with standard industrial ±10V and military ±15V signal sources without external level-shifting circuitry. The device maintains specified on-resistance and leakage performance across this full range.

Does MAX317CPA require separate logic and analog ground connections?

No - the MAX317CPA uses a single GND pin (Pin 3) for logic reference, and does not isolate logic ground from analog return paths internally. However, best practice requires separating GND traces on the PCB: route the GND pin to a clean digital ground plane, while keeping analog return currents on dedicated low-noise paths. Mixing returns degrades PSRR and increases crosstalk in sensitive measurement circuits.

Can MAX317CPA operate from a single +12V supply?

Yes - the MAX317CPA supports single-supply operation from +10V to +30V. When using +12V, connect V− to GND, set VL = +5V for TTL compatibility (or tie VL to V+ for CMOS logic), and ensure analog signals remain within 0V to +12V. Note that on-resistance increases slightly versus bipolar operation, and leakage rises above +85°C - verify against the single-supply electrical characteristics table in the datasheet.

What is the function of Pin 2 (N.C.) on MAX317CPA?

Pin 2 on the MAX317CPA is labeled N.C. (No Connect) and is not bonded to any internal circuitry. It must remain unconnected on the PCB - no trace, via, or solder mask opening should be placed at this location. Leaving Pin 2 floating avoids parasitic coupling or unintended capacitance that could affect high-frequency isolation or ESD performance. This pin is structurally present for package symmetry but electrically inactive.

How does the logic polarity of MAX317CPA affect switch state control?

The MAX317CPA uses active-low logic control: the switch is closed (COM connected to NC) when IN (Pin 6) is at logic low (≤0.8V), and open when IN is at logic high (≥2.4V). This normally closed behavior provides fail-safe operation - if control logic fails or power is lost, the signal path remains intact. Microcontroller GPIO pins can drive IN directly, provided they meet the ±0.5µA input current specification.