Analog Devices Inc./Maxim Integrated DG405CY

Overview

DG405CY 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 guaranteed 2Ω max on-resistance matching between channels, 3Ω max on-resistance flatness over ±15V signal range, and 15pC max charge injection - enabling low-distortion sampling in test equipment and guidance systems.

For engineers reviewing the DG405CY datasheet, DG405CY pinout, DG405CY application, or DG405CY equivalent, key selection criteria include rail-to-rail analog signal handling (±15V), sub-150ns switching speed, TTL/CMOS logic compatibility, and <5nA off-leakage at +85°C in industrial temperature environments.

Technical Context

The DG405CY implements two independent SPST analog switches with complementary control logic: IN1 controls S1/D1, IN2 controls S2/D2. Each switch conducts bidirectionally with matched r_DS(ON) and flat on-resistance across the full analog range from V− to V+.

It operates from ±4.5V to ±20V bipolar supplies or +10V to +30V single supply, with separate VL pin for +5V logic interface. Internal substrate connection to V+ enables robust ESD protection and stable operation up to 44V absolute maximum rating.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (0°C to +70°C operating range). Pinout validated per Maxim datasheet Rev 2 (19-4727).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRUZ and TS5A23157DGSR, the DG405CY uniquely supports true bipolar analog signal routing (±15V), operates across industrial temperature range (0°C to +70°C), and guarantees matched on-resistance - making it irreplaceable in test equipment and avionics where signal fidelity and supply flexibility are non-negotiable.

Availability

DG405CY is available at Aetrix Electronics and suitable for test equipment, sample-and-hold circuits, and battery-operated guidance systems requiring stable component supply across extended production lifecycles.

Supply support for DG405CY 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 precision analog, mixed-signal, and high-reliability interface solutions for industrial, automotive, and communications markets.

The DG405CY belongs to Maxim's legacy high-speed analog switch family, engineered for mission-critical signal routing where low charge injection, matched on-resistance, and bipolar supply operation are essential - particularly in defense, aerospace, and automated test systems.

FAQ

What is the maximum analog signal voltage range supported by the DG405CY?

The DG405CY supports a full rail-to-rail analog signal range from V− to V+, with guaranteed operation up to ±15V when powered from ±15V supplies. Its absolute maximum rating allows V+ to V− differential up to 44V, but the usable linear signal range remains bounded by the applied supply rails - e.g., +15V/−15V yields ±15V analog swing. This is confirmed in the Electrical Characteristics table under "Analog Signal Range" (V_ANALOG = ±15V).

Does the DG405CY require a separate logic supply voltage, and why is VL necessary?

Yes, the DG405CY requires a dedicated VL pin, typically tied to +5V, to establish logic thresholds independent of analog supply rails. This ensures TTL/CMOS compatibility even when V+ and V− operate at ±15V or other non-5V levels. The VL pin directly biases internal level-shifters, guaranteeing reliable switching at VINH = +2.4V and VINL = +0.8V regardless of analog supply configuration - a key feature documented in the "Logic Inputs" section of the datasheet.

How does the DG405CY achieve low charge injection, and what impact does it have in sample-and-hold designs?

The DG405CY achieves ≤15pC max charge injection through optimized MOSFET gate overlap and charge-balanced switching architecture, verified at TA = +25°C with CL = 1.0nF and R_GEN = 0Ω. In sample-and-hold circuits, this limits hold-mode voltage step error: for a 10kΩ source impedance and 1nF hold capacitor, 15pC injects <1.5mV glitch - critical for 12-bit+ accuracy. This value is explicitly tested and guaranteed per Note 3 in the Electrical Characteristics table.

Can the DG405CY be used with single-supply operation, and what are the voltage limits?

Yes, the DG405CY supports single-supply operation from +10V to +30V, with analog signals ranging from GND to V+. For example, at V+ = +15V and V− = GND, the device switches 0V to +15V signals. The datasheet confirms this in "Power-Supply Range" (single supply: +10V to +30V) and "Existing Features", and Typical Operating Characteristics Figure MAX401-3 validates on-resistance behavior under single-supply conditions.

What is the thermal performance of off-leakage current in the DG405CY, and how is it specified?

The DG405CY guarantees off-leakage current <5nA at +85°C - a key reliability metric for high-impedance interfaces. This is measured at maximum rated hot temperature (TA = +85°C) and 100% tested per Note 7. At +25°C, typical off-leakage is <0.5nA. The specification applies to both source-off (I_S(OFF)) and drain-off (I_D(OFF)) currents, and is validated across the full 0°C to +70°C commercial temperature range per Ordering Information table.