Analog Devices Inc./Maxim Integrated DG423DY+T

Overview

DG423DY+T from Maxim Integrated is a dual, single-pole/double-throw (SPDT) CMOS analog switch with latched logic inputs, designed for precision signal routing in ±4.5V to ±20V bipolar or +10V to +30V single-supply systems. It features 20Ω typical on-resistance, 3Ω maximum on-resistance matching between channels, 15pC maximum charge injection, and operates across –40°C to +85°C. It is used in audio signal routing and test equipment where rail-to-rail analog switching and µP-compatible control are required.

For engineers reviewing the DG423DY+T datasheet, DG423DY+T pinout, DG423DY+T application, or DG423DY+T equivalent, key selection criteria include guaranteed r_DS(ON) match (≤3Ω), latch timing (t_WW/t_DW/t_WD ≤ 200/100/100 ns), break-before-make interval (≤15 ns), low off-leakage (<5 nA at +85°C), and ESD tolerance (≥2000 V per Method 3015.7).

Technical Context

The DG423DY+T implements two independent SPDT switches with separate S1/S2 sources and D1–D4 drains, controlled via WR (write), RS (reset), and IN1/IN2 logic inputs. Its latch architecture enables transparent or stored control states, eliminating need for continuous µP bus hold during switching.

It uses a 44V silicon-gate CMOS process enabling rail-to-rail analog signal handling (V_ANALOG = V₊ to V₋), with guaranteed on-resistance flatness (≤4Ω max) and matching only under bipolar supply operation. Logic interface supports TTL/CMOS levels when VL = +5V, and remains functional with VL tied to V+ for CMOS-level compatibility.

Key Specifications

Pinout & Package

Package: 16-pin SO (Small Outline), RoHS-compliant, surface-mount, body size 9.9 mm × 3.9 mm × 1.75 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG423BRZ and TS5A3157DCKR, the DG423DY+T uniquely combines latch control, bipolar supply support, and guaranteed channel matching - making it optimal for industrial test, military comms, and precision instrumentation where timing autonomy and signal integrity are critical.

Availability

DG423DY+T is available at Aetrix Electronics and suitable for audio signal routing, test equipment multiplexing, and battery-operated data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG423DY+T 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 high-reliability semiconductor solutions for industrial, communications, and aerospace markets.

The DG423DY+T belongs to the DG42x family of latching CMOS analog switches, engineered for applications demanding low distortion, high channel matching, and robust operation in harsh supply environments.

FAQ

What is the operating temperature range for DG423DY+T?

The DG423DY+T is rated for –40°C to +85°C ambient operation. This industrial-grade temperature range is confirmed in the Maxim ordering information table, where "DG423DY" explicitly maps to the –40°C to +85°C grade. The SO package variant supports reliable performance in embedded systems exposed to thermal cycling and uncontrolled environments.

Does DG423DY+T require a separate logic supply (VL), and what happens if VL is tied to V+?

Yes, DG423DY+T requires VL for logic interface. When VL = +5V, it achieves TTL compatibility. If VL is tied to V+, the device operates with CMOS-level logic thresholds (V_IL ≤ 0.3×V+, V_IH ≥ 0.7×V+), as specified in the Applications Information section. This configuration maintains full functionality but shifts input voltage thresholds proportionally to the main supply.

Can DG423DY+T operate from a single +12V supply, and what is the usable analog signal range?

Yes, DG423DY+T supports single-supply operation from +10V to +30V. With V+ = +12V and V− = 0V (GND), the analog signal range spans 0V to +12V. Rail-to-rail capability is preserved, and on-resistance remains within spec (20Ω typ), as verified in Figure MAX401-3 of the datasheet showing r_DS(ON) vs. V_D for V+ = 12V, V− = 0V.

What is the function of the N.C. pins (pins 3, 4, 5, 6) on DG423DY+T?

Pins 3, 4, 5, and 6 on DG423DY+T are No Internal Connection (N.C.) - they have no bond wire or internal circuitry attached. Per the Pin Descriptions section, these pins must remain unconnected. Neither grounding nor routing is permitted, as doing so may compromise package integrity or introduce parasitic coupling.

How does the break-before-make interval affect signal integrity in DG423DY+T?

The DG423DY+T guarantees a break-before-make interval ≤15ns (at +25°C), preventing momentary shorting between normally open (NO) and normally closed (NC) contacts during switching. This eliminates cross-talk and transient glitches in sensitive analog paths - critical in applications like relay replacement, signal source selection, and protection circuitry where signal collision must be avoided.