Analog Devices Inc./Maxim Integrated DG401DY+T

Overview

DG401DY+T from Maxim Integrated is a dual, high-speed, normally open analog switch IC designed for precision signal routing in bipolar or single-supply systems. It features 20Ω typical on-resistance, 2Ω maximum on-resistance matching between channels, 15pC maximum charge injection, and operates from ±4.5V to ±20V or +10V to +30V supplies - enabling rail-to-rail analog switching in test equipment and audio signal routing.

For engineers reviewing the DG401DY+T datasheet, DG401DY+T pinout, DG401DY+T application, or DG401DY+T equivalent, key selection criteria include guaranteed on-resistance flatness (≤3Ω), low off-leakage (<5nA at +85°C), sub-150ns turn-on time, and TTL/CMOS logic compatibility with independent VL supply.

Technical Context

The DG401DY+T implements two independent SPST analog switches fabricated in a 44V silicon-gate process, supporting bidirectional conduction with matched channel characteristics. Its architecture guarantees rDS(ON) match ≤2Ω and rFLAT(ON) ≤3Ω across the full analog signal range (±15V), ensuring minimal gain error in multiplexed instrumentation paths.

Switch control uses noninverting logic inputs (IN1/IN2) referenced to VL = +5V, with internal substrate tied to V+, enabling robust operation under supply sequencing constraints. The device delivers 72dB off-isolation and 90dB crosstalk at 1MHz, critical for high-fidelity signal integrity in communications and guidance systems.

Key Specifications

Pinout & Package

DG401DY+T is supplied in a 16-pin plastic DIP package (0.300" wide), rated for –40°C to +85°C operation. Pin functions are validated per Maxim's official DG401 pin description table and top-view schematic.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRUZ and TS5A23157DCUR, DG401DY+T uniquely supports both bipolar (±4.5V to ±20V) and wide single-supply (up to +30V) operation while guaranteeing ≤2Ω channel matching and <5nA leakage at +85°C - making it the only option qualified for military radio and guidance system signal conditioning where supply flexibility and thermal stability are non-negotiable.

Availability

DG401DY+T is available at Aetrix Electronics and suitable for test equipment, guidance and control systems, and audio signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG401DY+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and aerospace applications.

DG401DY+T belongs to Maxim's legacy high-speed analog switch family, engineered for precision signal routing in demanding environments including military radios, PBX systems, and automated test equipment where rail-to-rail operation and thermal stability are essential.

FAQ

What supply voltages does DG401DY+T support?

DG401DY+T operates from bipolar supplies of ±4.5V to ±20V or a single positive supply of +10V to +30V. The analog signal range extends rail-to-rail between V+ and V−, and VL must be +5V for TTL compatibility. This dual-supply flexibility makes DG401DY+T suitable for both legacy industrial systems and modern single-rail designs without level-shifting circuitry.

How does DG401DY+T achieve low charge injection, and why does it matter?

DG401DY+T achieves ≤15pC maximum charge injection through optimized MOSFET gate overlap design and internal charge cancellation techniques. This matters because injected charge causes voltage glitches on hold capacitors in sample-and-hold circuits and ADC front-ends - directly impacting conversion accuracy, especially in high-resolution (≥16-bit) data acquisition systems where DG401DY+T is commonly deployed.

Is DG401DY+T pin-compatible with older DG401 variants?

Yes, DG401DY+T is a plug-in upgrade for industry-standard DG401 devices in the 16-pin DIP package. It retains identical pinout, supply requirements, and logic interface while improving rDS(ON) matching (≤2Ω vs. older 5Ω spec), charge injection (≤15pC vs. ≤25pC), and off-leakage (<5nA at +85°C vs. <20nA). No PCB changes are required for drop-in replacement.

What is the maximum analog signal frequency supported by DG401DY+T?

DG401DY+T supports analog signals up to at least 1MHz, as verified by 72dB off-isolation and 90dB crosstalk measurements at that frequency. Its 39pF channel-on capacitance and 12pF off-capacitance minimize high-frequency loading, while 150ns/100ns switching times enable reliable operation in multiplexed audio and communications applications below 10MHz - though bandwidth is ultimately limited by external RC time constants and layout parasitics.

Does DG401DY+T require special power supply sequencing?

Yes - Maxim recommends powering V+ first, then VL, followed by V− and logic inputs to avoid latch-up or overstress. If strict sequencing isn't feasible, external blocking diodes can be added to V+ and V− pins (per Figure 1 in the datasheet) to protect against overvoltage transients. DG401DY+T's substrate connection to V+ makes proper sequencing critical for long-term reliability in high-reliability systems like guidance controls.