Analog Devices Inc./Maxim Integrated DG409CY+T

Overview

DG409CY+T from Maxim Integrated is a dual 4-channel CMOS analog multiplexer/demultiplexer designed for precision signal routing in mixed-signal systems. It features guaranteed on-resistance matching ≤8Ω, flatness ≤9Ω, low charge injection ≤15pC, and operates from ±5V to ±20V dual supplies or +5V to +30V single supply. Used in data-acquisition systems where channel-to-channel consistency and rail-to-rail analog signal handling are critical.

For engineers reviewing the DG409CY+T datasheet, DG409CY+T pinout, DG409CY+T application, or DG409CY+T equivalent, key selection criteria include guaranteed on-resistance matching across channels, low leakage (<5nA at +85°C), TTL/CMOS-compatible digital control, and ESD protection >2000V - all validated for industrial-temperature operation (0°C to +70°C) in narrow SO package.

Technical Context

The DG409CY+T implements a dual independent 4:1 analog switch architecture with CMOS decoder logic decoding A0/A1 address inputs and EN enable control. Each 4-channel section routes one of four bidirectional analog signals (S1A–S4A or S1B–S4B) to its respective output (DA or DB), supporting simultaneous differential or independent signal paths.

It guarantees matched on-resistance (ΔrDS(ON) ≤8Ω) and flatness (rFLAT ≤9Ω) over the full analog signal range (±10V with ±15V supplies), enabling high-fidelity sampling in instrumentation-grade applications. Charge injection (≤15pC) and off-leakage (<5nA at +85°C) are fully specified and tested, ensuring minimal settling error and DC drift in sample-and-hold circuits.

Key Specifications

Pinout & Package

Package: 16-pin narrow SO (SOIC), 3.9mm width, JEDEC MS-012AC compliant, RoHS-compliant, tape-and-reel (DG409CY+T).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-channel analog multiplexer applications.

Compared with DG409CY+T, ADG409BRUZ offers broader temperature support but lacks guaranteed matching and flatness specs critical for metrology-grade DAQ; TS5A23157DGSR provides ultra-low RON but cannot replace the dual 4-channel architecture or high-voltage capability of DG409CY+T.

Availability

DG409CY+T is available at Aetrix Electronics and suitable for data-acquisition systems, automated test equipment, and guidance and control systems requiring stable component supply, long-term lifecycle assurance, and industrial-temperature performance.

Supply support for DG409CY+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 computing applications.

The DG409CY+T belongs to Maxim's high-precision analog switch product line, engineered for applications demanding guaranteed matching, low charge injection, and robust operation across wide supply ranges - particularly in test, measurement, and control systems.

FAQ

What is the maximum analog signal range supported by DG409CY+T?

The DG409CY+T supports rail-to-rail analog signals from V− to V+. With ±15V dual supplies, this delivers a ±15V range; with +12V/0V single supply, it supports 0V to +12V. The datasheet specifies guaranteed performance (e.g., on-resistance flatness) over ±10V with ±15V supplies. Exceeding supply rails violates absolute maximum ratings and risks damage.

Is DG409CY+T pin-compatible with the original DG409?

Yes, DG409CY+T is explicitly designed as a pin-compatible plug-in upgrade for the industry-standard DG409. It shares identical pinout, package (16-pin narrow SO), electrical timing, and logic interface - allowing direct replacement without PCB or firmware changes. This is confirmed in Maxim's General Description and Features sections.

Does DG409CY+T support single-supply operation?

Yes, DG409CY+T operates with a +5V to +30V single supply. In this mode, V− must be connected to GND. The device maintains rail-to-rail signal handling (0V to V+), and all key specs - including on-resistance (100Ω max), charge injection (15pC max), and leakage (<5nA at +70°C) - are guaranteed under single-supply conditions per the Electrical Characteristics table.

What is the enable logic polarity for DG409CY+T?

DG409CY+T uses active-low enable logic: the EN pin must be pulled low (≤0.8V) to activate both 4-channel sections. When EN is high (≥2.4V), all switches are disabled (high-impedance state). This is confirmed in the Truth Table and Pin Description sections, where "EN = 0" corresponds to "ON SWITCH" entries.

How does DG409CY+T handle power-supply sequencing?

DG409CY+T requires proper sequencing: V+ should be applied first, then V−, followed by logic inputs (A0, A1, EN). Violating this risks latch-up or overstress. If controlled sequencing isn't possible, external blocking diodes (as shown in Figure 1 of the datasheet) can be added to protect the device - though this reduces usable analog range by ~1V per rail.