Analog Devices Inc./Maxim Integrated DG403DY

Overview

DG403DY from Maxim Integrated is a dual, single-pole/double-throw (SPDT) high-speed analog switch with two normally open and two normally closed channels, 20Ω typical on-resistance, 150ns max tON, and ±4.5V to ±20V bipolar or +10V to +30V single-supply operation - used in precision audio routing and military radio signal path switching.

For engineers reviewing the DG403DY datasheet, DG403DY pinout, DG403DY application, or DG403DY equivalent, key selection criteria include guaranteed 2Ω max on-resistance matching between channels, <5nA off-leakage at +85°C, rail-to-rail analog signal handling, TTL/CMOS logic compatibility, and break-before-make timing of 10–20ns.

Technical Context

The DG403DY implements a silicon-gate CMOS architecture with substrate tied to V+, enabling robust rail-to-rail analog conduction and low charge injection (10–15pC). Its dual SPDT topology supports independent control of two switch pairs via IN1/IN2 logic inputs, each driving complementary S1/D1/S3/D3 and S2/D2/S4/D4 paths.

Switching is characterized by fast 100–150ns turn-on and 60–100ns turn-off times under ±15V supplies, with guaranteed flat on-resistance (≤3Ω variation over ±10V signal range) and matched channel resistance (≤2Ω delta), critical for precision multiplexing in sample-and-hold and test equipment.

Key Specifications

Pinout & Package

DG403DY is housed in a 16-pin plastic DIP package (0.300" wide), rated for –40°C to +85°C operation, with through-hole mounting and standard JEDEC MO-019 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG403BRZ and TS5A3157DCKR, DG403DY uniquely delivers guaranteed 2Ω channel matching, <5nA off-leakage at +85°C, and true ±20V bipolar operation - making it irreplaceable in military radio and precision test equipment where signal integrity across wide voltage and temperature ranges is non-negotiable.

Availability

DG403DY is available at Aetrix Electronics and suitable for military radio front-ends, automated test equipment, and guidance system sensor interfaces requiring stable component supply across extended temperature cycling and long production lifecycles.

Supply support for DG403DY 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 ICs for demanding industrial, aerospace, and defense applications.

The DG403DY belongs to Maxim's legacy high-speed analog switch family, engineered specifically for rail-to-rail signal routing in military, test, and avionics systems where leakage, matching, and temperature stability are design-critical.

FAQ

What is the maximum allowable supply voltage for DG403DY?

The DG403DY supports bipolar supplies from ±4.5V to ±20V or a single supply from +10V to +30V. Absolute maximum ratings specify V+ to V− differential up to 44V, with V+ ≤ 44V referenced to V−. Exceeding these limits risks permanent damage, and proper power sequencing (V+ first, then VL, V−, and logic inputs) is mandatory for reliability.

Does DG403DY support rail-to-rail analog signal switching?

Yes, DG403DY supports rail-to-rail analog signal switching - signals from V− to V+ are fully passed with minimal distortion. This is enabled by its silicon-gate process and substrate tied to V+, allowing undistorted conduction across the full supply range, including ±15V operation with no signal clipping.

What is the logic supply (VL) requirement for TTL compatibility with DG403DY?

For TTL compatibility, DG403DY requires VL = +5V. When VL is tied to +5V, the device accepts standard TTL logic thresholds (VINH ≥ +2.4V, VINL ≤ +0.8V). If VL is connected to V+ or another voltage, the device operates with CMOS-level inputs instead - but TTL compatibility is only guaranteed at VL = +5V.

How does DG403DY achieve low charge injection, and why does it matter?

DG403DY achieves low charge injection (10–15pC max) through matched transistor geometry and optimized gate drive in its CMOS switch structure. This matters critically in sample-and-hold circuits and precision ADC front-ends, where injected charge causes voltage glitches on hold capacitors - degrading acquisition accuracy and increasing settling time.

Is DG403DY pin-compatible with older DG403 variants like DG403DJ or DG403CY?

Yes, DG403DY shares identical 16-pin DIP pinout and function with DG403CY (commercial temp) and DG403DJ (dice), as confirmed by Maxim's ordering table and pin description documentation. All three use the same S1–S4, D1–D4, IN1/IN2, V+/V−/VL/GND assignment - enabling drop-in replacement within their respective temperature grades.