Analog Devices Inc./Maxim Integrated DG403CY+T

Overview

DG403CY+T from Maxim Integrated is a dual, single-pole/double-throw (SPDT) high-speed analog switch with two normally open and two normally closed channels. It features 20Ω typical on-resistance, 2Ω maximum on-resistance matching between channels, 3Ω maximum on-resistance flatness over ±15V signal range, and 15pC maximum charge injection - enabling precision signal routing in sample-and-hold circuits and test equipment.

For engineers reviewing the DG403CY+T datasheet, DG403CY+T pinout, DG403CY+T application, or DG403CY+T equivalent, this device supports rail-to-rail analog signal handling from ±4.5V to ±20V bipolar supplies or +10V to +30V single supply, delivers 150ns max tON/100ns max tOFF switching, and maintains TTL/CMOS logic compatibility with VL = +5V.

Technical Context

The DG403CY+T implements a silicon-gate CMOS architecture with substrate tied to V+, enabling robust ±44V absolute maximum rating and low off-leakage performance (<5nA at +85°C). Its dual SPDT topology provides independent control of two bidirectional analog paths via separate IN1/IN2 logic inputs.

Each channel exhibits symmetrical conduction (rDS(ON) identical for S→D and D→S), guaranteed rFLAT(ON) ≤3Ω across full analog range, and break-before-make timing (10–20ns) to prevent signal shorting during state transitions - critical for audio routing and guidance systems requiring glitch-free switching.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (0.300" wide), RoHS-compliant, operating temperature range 0°C to +70°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1434BRUZ and TS5A3157DCKR, the DG403CY+T uniquely supports ±15V rail-to-rail analog operation in a through-hole DIP package while delivering balanced performance in on-resistance match, flatness, and switching speed - making it ideal for legacy industrial and military systems where supply voltage headroom and mechanical robustness are critical.

Availability

DG403CY+T is available at Aetrix Electronics and suitable for sample-and-hold circuits, test equipment, guidance and control systems, and audio signal routing requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for DG403CY+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and aerospace applications.

The DG403CY+T belongs to Maxim's legacy high-speed analog switch family, designed specifically for precision signal routing in environments demanding rail-to-rail operation, low charge injection, and guaranteed channel matching - especially in military radios and PBX systems.

FAQ

What supply voltages does the DG403CY+T support?

The DG403CY+T operates from bipolar supplies of ±4.5V to ±20V or a single +10V to +30V supply. Its analog signal range extends fully from V− to V+, supporting ±15V signals with ±15V supplies. The logic supply VL must be +5V for TTL compatibility, though it may tie to V+ for CMOS-level operation. Power sequencing requires V+ first, then VL, V−, and logic inputs to avoid overstress.

How many analog channels does the DG403CY+T provide, and what is its switching topology?

The DG403CY+T provides two independent single-pole/double-throw (SPDT) analog channels. Each channel has one common source (S1 or S2), one normally open drain (D1 or D3), and one normally closed drain (D2 or D4). This allows simultaneous selection between two signal paths per channel under separate IN1/IN2 logic control - confirmed by the functional diagram and truth table in the DG403CY+T datasheet.

What is the maximum charge injection specification for DG403CY+T, and why does it matter?

The DG403CY+T has a maximum charge injection of 15pC, measured with CL = 1.0nF and RGEN = 0Ω at TA = +25°C. This parameter directly impacts hold-step accuracy in sample-and-hold circuits: lower charge injection reduces voltage error on the hold capacitor, preserving DC precision and minimizing settling time. At 15pC, DG403CY+T meets requirements for 12-bit+ data acquisition systems.

Is the DG403CY+T pin-compatible with earlier DG403 variants like DG403CJ or DG403DY?

Yes - the DG403CY+T shares identical 16-pin plastic DIP pinout, electrical specifications, and functional behavior with DG403CJ and DG403DY. All three use the same die and packaging process, differing only in temperature grade labeling (C-grade = 0°C to +70°C) and tape-and-reel vs. tube packaging. No PCB changes are required when substituting DG403CY+T for these variants.

Does DG403CY+T require external protection diodes for overvoltage conditions?

External blocking diodes are optional and only needed if strict power-supply sequencing cannot be guaranteed. The DG403CY+T includes internal clamping diodes that limit analog signals exceeding V+ or V−, but permanent damage may occur if forward current exceeds 20mA. When used, external series diodes reduce analog range by ~1V but preserve low rDS(ON) and leakage - as validated in Maxim's Application Information section.