Analog Devices Inc./Maxim Integrated DG508ADY

Overview

DG508ADY from Maxim Integrated is a monolithic CMOS 8-channel analog multiplexer (1-of-8) with ±4.5V to ±18V dual-supply operation, break-before-make switching, and guaranteed latchup immunity during power-off signal presence. It features 500Ω typical on-resistance at ±15V, <0.5nA off-leakage at +25°C, and operates across –40°C to +85°C in industrial control and data-acquisition systems.

For engineers reviewing the DG508ADY datasheet, DG508ADY pinout, DG508ADY application, or DG508ADY equivalent, key selection criteria include its narrow SO-16 package, ±9V minimum supply requirement, symmetrical bidirectional analog signal routing, and TTL/CMOS-compatible logic inputs with sub-microsecond enable timing.

Technical Context

The DG508ADY implements a fully decoded 3-bit address (A0–A2) to select one of eight bidirectional analog channels (S1–S8) to a common drain (D), with independent enable (EN) control. Its CMOS architecture ensures symmetrical conduction and low charge injection (<10pC).

Break-before-make switching is guaranteed with a 0.2μs minimum open interval, preventing momentary shorting during channel transitions. The device maintains functional integrity across supply voltages from ±9V to ±18V, with leakage and on-resistance values specified over full temperature range (–40°C to +85°C).

Key Specifications

Pinout & Package

Package: 16-pin narrow SO (SOIC-N), RoHS-compliant, body width 3.9mm, pitch 0.635mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG508ADY, MAX338ESE+ simplifies power design in 5V systems but sacrifices dual-supply versatility, while ADG508AKRZ improves leakage performance at the cost of guaranteed +85°C operation-making DG508ADY the optimal choice for robust industrial multiplexing requiring full temperature compliance and ±15V signal support.

Availability

DG508ADY is available at Aetrix Electronics and suitable for industrial control systems, aircraft avionics subsystems, and portable data-acquisition equipment requiring stable component supply across extended temperature ranges and dual-supply analog routing capability.

Supply support for DG508ADY 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 industrial, automotive, and communications applications.

The DG508ADY belongs to Maxim's legacy analog multiplexer product line, engineered specifically for high-reliability signal routing in harsh-environment systems demanding latchup immunity, wide supply tolerance, and guaranteed break-before-make behavior.

FAQ

What is the minimum supply voltage required for reliable operation of the DG508ADY?

The DG508ADY requires a minimum dual-supply voltage of ±9V for continuous operation, as explicitly stated in the datasheet for the DG508ADY/MY and DG509ADY/MY variants. Operation below ±9V is not characterized or guaranteed, and may result in increased on-resistance, degraded leakage, or failure to meet break-before-make timing specifications. Always verify supply stability under load conditions before final design sign-off.

Does the DG508ADY support bidirectional analog signal flow between the D pin and any Sx pin?

Yes, the DG508ADY supports fully symmetrical bidirectional operation: analog signals pass with identical on-resistance, capacitance, and leakage characteristics whether routed from S1–S8 to D or from D to S1–S8. This is inherent to its monolithic CMOS construction and confirmed by the "Symmetrical, Bidirectional Operation" feature listing and electrical characterization across both directions in the datasheet.

Is the DG508ADY pin-compatible with the industry-standard DG508A?

Yes, the DG508ADY is a plug-in upgrade for the industry-standard DG508A, sharing identical pin configuration, pin functions, and footprint in the 16-pin narrow SO package. No PCB layout changes are required when replacing legacy DG508A devices with DG508ADY, though users benefit from improved enable timing, lower leakage, and extended –40°C to +85°C temperature qualification.

What is the maximum allowable analog signal voltage range for the DG508ADY?

The DG508ADY supports analog signals from V− to V+, with absolute maximum ratings specifying V− ≥ –15V and V+ ≤ +15V for standard operation. The datasheet defines the analog signal range as ±15V, meaning signals may swing from –15V to +15V relative to ground when powered by ±15V supplies. Exceeding these limits risks clamping or damage due to internal diode conduction.

How does the DG508ADY prevent latchup when power supplies are turned off while analog signals remain present?

The DG508ADY uses latchup-proof monolithic CMOS construction with process-level isolation techniques that eliminate parasitic SCR formation. As confirmed in the datasheet, Maxim guarantees no latchup occurs even when input signals are applied while V+ and V− are at 0V-enabling safe hot-swap or partial-power-down scenarios in modular instrumentation and avionics systems without external protection circuitry.