Analog Devices Inc./Maxim Integrated DG405C/D

Overview

DG405C/D from Maxim Integrated is a dual, high-speed, normally open analog switch IC with SPST configuration per channel, designed for precision signal routing in bipolar or single-supply systems. It features guaranteed 20Ω typical on-resistance (30Ω max), ≤2Ω channel-to-channel on-resistance matching, and ≤15pC charge injection - enabling low-distortion sampling in test equipment and communications systems.

For engineers reviewing the DG405C/D datasheet, DG405C/D pinout, DG405C/D application, or DG405C/D equivalent, this device is selected for rail-to-rail analog signal handling (±15V range), sub-150ns switching speed, TTL/CMOS logic compatibility, and low off-leakage (<5nA at +85°C) in battery-operated and military-grade signal-path designs.

Technical Context

The DG405C/D implements two independent single-pole/single-throw (SPST) switches fabricated in a 44V silicon-gate process. Each switch conducts bidirectionally with matched on-resistance and flat on-resistance profile (≤3Ω variation across ±15V signal range), ensuring minimal gain error in precision multiplexing.

It supports dual-supply operation (±4.5V to ±20V) or single-supply operation (+10V to +30V), with separate logic supply (VL = +5V) for TTL-level control. Internal substrate connection to V+ enables robust overvoltage tolerance, and break-before-make timing is not applicable (SPST topology).

Key Specifications

Pinout & Package

Package: 16-pin narrow SOIC (small-outline integrated circuit), surface-mount, 7.5mm × 10.3mm body, 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG405BRZ and TS5A23157DCUR, the DG405C/D uniquely delivers guaranteed ≤2Ω channel matching, ≤3Ω on-resistance flatness, and <5nA off-leakage at +85°C - making it the preferred choice for high-fidelity, wide-dynamic-range analog multiplexing where parameter consistency across temperature and signal range is non-negotiable.

Availability

DG405C/D is available at Aetrix Electronics and suitable for test equipment signal routing, audio signal switching, military radio front-end isolation, and battery-operated guidance systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.

Supply support for DG405C/D 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 military applications.

The DG405C/D belongs to Maxim's legacy DG40x family of high-speed analog switches, engineered specifically for precision signal routing in environments demanding low distortion, tight parameter matching, and robust operation across wide supply and temperature ranges.

FAQ

What is the maximum analog signal voltage range supported by the DG405C/D?

The DG405C/D supports analog signals from V− to V+, enabling rail-to-rail operation. With ±15V supplies, the full range is −15V to +15V. When operated from a single +30V supply (V− = 0V), the range is 0V to +30V. This capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where VANALOG is specified as ±15V under standard test conditions. The DG405C/D maintains low on-resistance and low leakage across this entire range.

Does the DG405C/D require external blocking diodes for overvoltage protection?

No, external blocking diodes are optional and only recommended if strict power-supply sequencing cannot be guaranteed. The DG405C/D includes internal protection diodes that clamp signals exceeding V+ or V−, provided forward current is limited to 20mA. Per the Applications Information section, proper sequencing (V+ first, then VL, V−, and logic inputs) eliminates the need for external diodes. Adding them reduces analog range by ~1V but preserves DG405C/D's core low-leakage and low-rDS(ON) performance.

Can the DG405C/D operate with VL tied directly to V+ instead of +5V?

Yes, but logic thresholds shift to CMOS levels. The DG405C/D remains functional with VL = V+, however, the input high/low voltage thresholds scale with VL. For guaranteed TTL compatibility (VINH = +2.4V min, VINL = +0.8V max), VL must be +5V. If VL = V+ (e.g., +15V), the DG405C/D accepts CMOS-level logic inputs, requiring compatible drivers. This behavior is explicitly documented in the "Logic Inputs" subsection of the Applications Information.

What is the guaranteed on-resistance match between the two switches in the DG405C/D?

The DG405C/D guarantees ≤2Ω maximum difference in on-resistance (∆rDS(ON)) between its two SPST switches, measured under matched conditions (V+ = 15V, V− = −15V, IS = −10mA, VD = ±10V). This specification is explicitly listed in the Electrical Characteristics table and is a key differentiator from earlier generations. It ensures matched gain/attenuation in dual-channel instrumentation and balanced signal paths.

Is the DG405C/D pin-compatible with the original DG405?

Yes - the DG405C/D is a plug-in upgrade for the industry-standard DG405, with identical pinout, package (16-pin narrow SOIC), logic behavior, and electrical interface. The datasheet states "Plug-In Upgrade for Industry-Standard DG401/DG403/DG405" under New Features, and the Pin Configurations section confirms identical numbering and terminal functions for DG405 and DG405C/D. No PCB changes are required for migration.