Analog Devices Inc./Maxim Integrated MAX317EPA+

Overview

MAX317EPA+ 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 across -40°C to +85°C with rail-to-rail analog signal handling and supports dual-supply (±4.5V to ±20V) or single-supply (+10V to +30V) operation in test equipment and military radio signal routing.

For engineers reviewing the MAX317EPA+ datasheet, MAX317EPA+ pinout, MAX317EPA+ application, or MAX317EPA+ equivalent, key selection criteria include guaranteed on-resistance matching (<2Ω), low leakage (<6nA at +85°C), fast switching (t_ON < 175ns), ESD tolerance (>±2000V), and compatibility with TTL/CMOS logic levels.

Technical Context

The MAX317EPA+ implements a silicon-gate CMOS architecture optimized for precision analog switching, featuring matched channel resistance and flat R_ON over full signal range (Δ3Ω max). Its design ensures minimal charge injection during switching-critical for sample-and-hold accuracy-and supports bipolar supply configurations that maintain guaranteed R_ON matching and flatness.

It uses a dedicated logic-level supply (VL) pin independent of analog rails, enabling TTL/CMOS-compatible control while maintaining rail-to-rail analog signal swing from V− to V+. The device integrates internal protection against overvoltage stress and exhibits sub-nA off-leakage at elevated temperatures, supporting high-impedance signal paths in guidance systems and PBX infrastructure.

Key Specifications

Pinout & Package

MAX317EPA+ is housed in an 8-pin plastic DIP package (0.300″ width), compliant with JEDEC MS-001. Pin 2 (N.C.) is not internally connected; all other pins serve defined analog or logic functions as verified in Maxim's official pin description table and topography diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRZ and TS5A3159DCKR, the MAX317EPA+ uniquely delivers factory-guaranteed NC behavior, bipolar supply capability, and parameter stability across military-grade temperature extremes-making it irreplaceable in safety-critical analog routing where default-closed fail-safe operation is mandated.

Availability

MAX317EPA+ is available at Aetrix Electronics and suitable for test equipment, military radios, and guidance systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX317EPA+ 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 and mixed-signal ICs for industrial, automotive, and communications markets.

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 operation in high-reliability military and aerospace signal routing.

FAQ

What is the default switch state of the MAX317EPA+?

The MAX317EPA+ is a normally closed (NC) analog switch: when the IN pin is logic low (≤0.8V), the COM–NC path is conductive; when IN is high (≥2.4V), the path opens. This fail-safe default ensures signal continuity during power loss or control failure-critical in guidance and military radio systems where uninterrupted signal flow is mandatory. The MAX317EPA+ maintains this NC behavior across its full -40°C to +85°C operating range.

Does the MAX317EPA+ support single-supply operation?

Yes, the MAX317EPA+ supports single-supply operation from +10V to +30V. In this mode, V− must be tied to ground, VL is typically connected to +5V for TTL compatibility, and analog signals swing from 0V to V+. The device retains rail-to-rail capability, low leakage (<250pA at +25°C), and fast switching (t_ON < 175ns), making it suitable for portable test gear and battery-powered avionics where dual supplies are impractical. Performance specifications in single-supply mode are fully characterized in the official datasheet.

What is the maximum analog signal voltage the MAX317EPA+ can handle?

The MAX317EPA+ supports analog signal voltages from V− to V+, with absolute maximum ratings of V+ ≤ (V− + 44V) and individual terminal limits of (V− − 2V) to (V+ + 2V). For example, with V+ = +15V and V− = −15V, the device handles ±15V signals continuously; with V+ = +30V and V− = 0V, it handles 0V to +30V. Exceeding these limits risks permanent damage. The 44V breakdown margin enables safe operation in systems with transient overvoltages, such as aircraft power buses or industrial motor drives.

How does charge injection affect circuit performance with the MAX317EPA+?

Charge injection in the MAX317EPA+ is guaranteed ≤10pC, meaning each switching event injects ≤10pC of net charge onto the COM node. In sample-and-hold circuits, this causes a voltage step ΔV = Q/C_HOLD; with a 10nF hold capacitor, error is limited to 1mV. This low value allows use in 12-bit+ data acquisition without additional correction circuitry. The MAX317EPA+'s matched transistor layout minimizes differential charge injection in multi-channel systems, preserving ratiometric accuracy across channels.

Is the MAX317EPA+ pin-compatible with other devices in the MAX317/MAX318/MAX319 family?

Yes, the MAX317EPA+ shares identical pinout and package (8-pin plastic DIP) with MAX318EPA+ (SPST-NO) and MAX319EPA+ (SPDT), enabling board-level substitution where function permits. However, logic polarity differs: MAX317EPA+ closes on logic low, while MAX318EPA+ closes on logic high. No PCB changes are needed for physical mounting, but firmware or external logic may require adjustment to match the NC vs. NO behavior. All three variants guarantee the same on-resistance, leakage, and timing specs under identical supply conditions.