Analog Devices Inc./Maxim Integrated MAX317CPA+

Overview

The MAX317CPA+ from Maxim Integrated is a precision CMOS single-pole single-throw (SPST) analog switch with normally closed (NC) configuration, 8-pin plastic DIP package, <35Ω maximum on-resistance, <10pC charge injection, and ±44V breakdown voltage. It enables rail-to-rail analog signal routing in sample-and-hold circuits and military radios requiring low leakage and fast switching.

For engineers reviewing the MAX317CPA+ datasheet, MAX317CPA+ pinout, MAX317CPA+ application, or MAX317CPA+ equivalent, key selection criteria include guaranteed matched on-resistance (<2Ω), off-leakage <6nA at +85°C, TTL/CMOS logic compatibility, dual-supply operation (±4.5V to ±20V), and ESD tolerance >±2000V.

Technical Context

The MAX317CPA+ implements a silicon-gate CMOS transmission-gate architecture optimized for precision analog signal switching. Its internal structure ensures symmetrical conduction paths between COM and NC terminals, with matched channel characteristics validated across temperature and supply voltage ranges.

It supports both bipolar (±4.5V to ±20V) and single-supply (+10V to +30V) operation, where V− must be tied to GND in unipolar mode. Logic control is referenced to VL (independent of analog supplies), enabling level-shifting flexibility without compromising analog signal integrity.

Key Specifications

Pinout & Package

MAX317CPA+ uses an 8-pin plastic DIP (dual in-line package) with 0.300-inch width, compliant with JEDEC MS-001. Pin 1 is COM (analog common), 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 MAX317CSA+, the MAX317CPA+ offers proven mechanical reliability in through-hole sockets and simplified hand-soldering, while ADG1419BRZ provides broader thermal margin at the cost of pinout incompatibility and higher charge injection - making MAX317CPA+ optimal for legacy military radio upgrades and lab-grade test fixtures.

Availability

MAX317CPA+ is available at Aetrix Electronics and suitable for sample-and-hold circuits, guidance and control systems, and military radios requiring stable component supply, long-term obsolescence management, and traceable sourcing from authorized channels.

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 precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and aerospace applications.

The MAX317/MAX318/MAX319 family was engineered specifically for high-fidelity analog signal routing in mil-spec and test equipment environments where low leakage, matched R_ON, and rail-to-rail operation are non-negotiable.

FAQ

What is the maximum allowable supply voltage for MAX317CPA+?

The MAX317CPA+ has an absolute maximum V+ to V− rating of +44V. Operation beyond this risks permanent damage. For reliable long-term use, bipolar supplies should stay within ±4.5V to ±20V, and single supplies within +10V to +30V. The MAX317CPA+ datasheet specifies that exceeding ±20V may degrade on-resistance flatness and increase leakage - always verify operating margins against actual signal swing requirements in your MAX317CPA+ design.

Does MAX317CPA+ support single-supply operation?

Yes, the MAX317CPA+ supports single-supply operation from +10V to +30V. In this mode, V− must be connected to GND, and VL should be tied to +5V for TTL compatibility or to V+ for CMOS logic levels. Note that on-resistance increases and switching speed degrades slightly versus bipolar operation - the MAX317CPA+ electrical characteristics table shows R_ON up to 100Ω and slower t_ON/t_OFF under +12V single-supply conditions.

What is the logic polarity of the IN pin on MAX317CPA+?

The IN pin on MAX317CPA+ is active-low: when IN is logic low (≤0.8V), the NC switch closes (COM ↔ NC conductive); when IN is logic high (≥2.4V), the NC switch opens (high-impedance state). This matches the truth table shown in the MAX317CPA+ functional diagram. No external inversion is needed - direct connection to microcontroller GPIO pins suffices for MAX317CPA+ control.

Can MAX317CPA+ be used in place of MAX318CPA+?

No - MAX317CPA+ and MAX318CPA+ are functionally distinct: MAX317CPA+ is normally closed (NC), while MAX318CPA+ is normally open (NO). Their pinouts differ (Pin 8 = NC on MAX317CPA+, Pin 8 = COM on MAX318CPA+), and substituting one for the other will invert switching behavior. Always verify signal path topology before replacement; the MAX317CPA+ cannot serve as a drop-in substitute for MAX318CPA+ without circuit modification.

What is the thermal performance of MAX317CPA+ in plastic DIP package?

The MAX317CPA+ plastic DIP package has a thermal resistance θ_JA of 110°C/W and a maximum continuous power dissipation of 727mW at +70°C ambient (derated 9.09mW/°C above). At full ±15V operation with 10mA load, power dissipation remains well below this limit. However, sustained operation near T_MAX (+70°C) requires attention to PCB copper area and airflow - the MAX317CPA+ datasheet notes that exceeding rated dissipation accelerates parameter drift and reduces long-term reliability.