Vishay Siliconix DG403DY

Overview

DG403DY from Vishay Siliconix is a dual SPDT CMOS analog switch IC designed for precision signal routing in ±15 V analog systems. It delivers 30 Ω typical on-resistance, 75 ns turn-on time, 40 pA channel on-leakage, and guaranteed break-before-make switching - enabling reliable audio/video multiplexing and battery-powered test equipment.

For engineers reviewing the DG403DY datasheet, DG403DY pinout, DG403DY application, or DG403DY equivalent, this page provides verified package mapping (16-pin SOIC), functional pin roles, real-world timing behavior, and validated alternatives for dual SPDT analog switching with ±15 V signal handling and sub-100 ns switching.

Technical Context

The DG403DY implements two independent SPDT switches per package with complementary control logic: logic high enables SW1/SW2 while disabling SW3/SW4, and vice versa. Its break-before-make timing (35 ns typical) is guaranteed via internal architecture and epitaxial layer latchup prevention.

It operates from dual ±15 V supplies with 5 V logic supply (VL), supports TTL/CMOS-compatible inputs, and maintains flat on-resistance across the full ±15 V analog range - matching JFET performance without dynamic range limitations.

Key Specifications

Pinout & Package

DG403DY is housed in a 16-pin narrow SOIC package (JEDEC MS-012, 3.9 × 9.9 mm body, 1.27 mm pitch), RoHS-compliant with lead-free terminations (E3 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4677ESE+ and ADG1434BRUZ, the DG403DY uniquely combines guaranteed break-before-make, ±15 V analog range, and 30 Ω on-resistance in a single SOIC package - making it optimal for safety-critical analog multiplexing where signal integrity and supply flexibility are non-negotiable.

Availability

DG403DY is available at Aetrix Electronics and suitable for audio routing, test equipment signal path management, and dual-slope integrator control requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

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

Vishay Siliconix is a global semiconductor manufacturer specializing in discrete components and analog ICs, with expertise in high-voltage, high-reliability silicon-gate process technology.

The DG403DY belongs to the DG401/DG403/DG405 family of precision CMOS analog switches, engineered for battery-powered and industrial applications demanding low power, fast switching, and robust bipolar signal handling.

FAQ

What is the maximum analog signal voltage range supported by the DG403DY?

The DG403DY supports a ±15 V analog signal range, meaning it can pass signals from –15 V to +15 V without distortion or clipping when operated with V+ = +15 V and V– = –15 V. This range is guaranteed across the full industrial temperature range (–40 °C to +85 °C) and is enabled by its proprietary high-voltage silicon-gate process. The DG403DY datasheet specifies that signals exceeding V+ or V– will be clamped by internal diodes, so maintaining supply rails within specification is essential for linear operation.

Does the DG403DY require external pull-up or pull-down resistors on its digital control inputs?

No, the DG403DY does not require external pull-up or pull-down resistors on IN1 or IN2. Its TTL/CMOS-compatible inputs have defined thresholds: logic "0" is ≤ 0.8 V and logic "1" is ≥ 2.4 V at VL = 5 V. Input currents are extremely low (±1 µA max), and internal circuitry ensures clean switching without external biasing. This simplifies interface design with microcontrollers and FPGAs, especially in space-constrained layouts where passive components add area and cost.

How is break-before-make timing ensured in the DG403DY, and what is its typical value?

Break-before-make timing in the DG403DY is guaranteed by internal circuit architecture and epitaxial layer design - not dependent on external timing or layout. The datasheet specifies a typical delay (t_D) of 35 ns between turn-off of one switch pair and turn-on of the complementary pair, measured under RL = 300 Ω and CL = 35 pF. This guarantee eliminates risk of momentary short-circuiting between signal sources, making the DG403DY suitable for applications like stereo source selection and dual-slope integrators where signal integrity depends on deterministic switching sequence.

Can the DG403DY operate from a single 12 V supply instead of dual ±15 V rails?

Yes, the DG403DY supports single-supply operation. When using a 12 V supply, connect V+ = 12 V, V– = 0 V (GND), and set VL = 5 V. In this configuration, the analog signal range becomes 0 V to 12 V (not ±15 V), and on-resistance increases slightly due to reduced gate overdrive. The device retains all core functionality - including break-before-make, low leakage, and TTL/CMOS compatibility - making it adaptable to mixed-signal systems where dual supplies are unavailable or impractical.

What is the thermal derating behavior of the DG403DY in SOIC package above 75 °C?

The DG403DY in 16-pin SOIC package has a thermal derating factor of 7.6 mW/°C above 75 °C ambient temperature. Its maximum power dissipation at 25 °C is 600 mW; therefore, at 100 °C ambient, allowable power drops to 600 mW – (25 °C × 7.6 mW/°C) = 410 mW. This derating applies to total package power (I+ × V+ + I– × |V–| + IL × VL). Designers must verify junction temperature remains below 150 °C using θ_JA = 100 °C/W (SOIC) and actual power dissipation in the target PCB layout.