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), TTL/CMOS logic compatibility with separate VL pin, sub-150ns switching times, and <5nA off-leakage at +85°C in industrial temperature operation.

Technical Context

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

It uses a 44V silicon-gate process and substrate tied to V+, supporting ±4.5V to ±20V dual supplies or +10V to +30V single supply. Logic interface is isolated via dedicated VL pin (typically +5V), ensuring TTL compatibility regardless of analog supply voltage.

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 SPST analog switch applications.

Compared with ADG405BRZ and TS5A23157DGSR, the DG405CY+ uniquely combines ±20V supply tolerance, separate VL logic reference, and guaranteed 2Ω channel matching - making it the only option among the three qualified for precision dual-channel sampling in guidance hardware and high-fidelity test instrumentation.

Availability

DG405CY+ is available at Aetrix Electronics and suitable for test equipment, guidance and control systems, and audio signal routing requiring stable component supply across industrial temperature grades and long-lifecycle programs.

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) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, automotive, and communications markets.

The DG405CY+ belongs to Maxim's legacy high-speed analog switch family, engineered specifically for low-distortion, rail-to-rail signal routing in military radios, PBX systems, and battery-operated instrumentation where leakage, matching, and speed are co-constrained.

FAQ

What is the maximum allowable voltage difference between V+ and V− for DG405CY+?

The DG405CY+ has an absolute maximum rating of 44V between V+ and V−. This limit is defined by the 44V silicon-gate process and applies regardless of individual rail voltages. Exceeding this differential risks permanent damage due to substrate breakdown. For example, V+ = +25V and V− = −20V yields 45V differential and violates the specification - safe operation requires |V+ − V−| ≤ 44V. The DG405CY+ datasheet confirms this in the Absolute Maximum Ratings table.

Does DG405CY+ support single-supply operation, and what is the minimum voltage?

Yes, DG405CY+ supports single-supply operation from +10V to +30V. In this configuration, V− is connected to ground (0V), and analog signals may swing from 0V to V+. The minimum valid single-supply voltage is +10V - operation below this level is not characterized or guaranteed per the Electrical Characteristics table. At +10V, rDS(ON) remains ≤30Ω and tON ≤150ns, meeting full-spec performance.

How is logic compatibility maintained when using ±15V analog supplies with DG405CY+?

Logic compatibility is maintained via the dedicated VL pin, which accepts a fixed +5V supply independent of V+ and V−. This decouples TTL/CMOS logic thresholds from analog rail voltages. When VL = +5V, the DG405CY+ guarantees proper switching for VINH ≥ +2.4V and VINL ≤ +0.8V - even if V+ = +15V and V− = −15V. This eliminates need for level translators in mixed-supply systems.

What does "N.C." mean for pins 2 and 7 on the DG405CY+ DIP package?

"N.C." stands for "Not internally connected" - pins 2 and 7 on the DG405CY+ have no bond wire or internal circuit connection. They must be left floating (unconnected) on the PCB; tying them to ground, supply, or signals may cause unpredictable behavior or increased leakage. This is explicitly stated in the Pin Description section and confirmed in the topography diagram showing no internal routing to these pads.

Is DG405CY+ suitable for battery-operated systems, and what is its quiescent power consumption?

Yes, DG405CY+ is optimized for battery-operated systems with a maximum total supply current of 35µW - comprising I+ ≤1µA, I− ≤1µA, IL ≤1µA, and IGND ≤1µA at +25°C. Its low off-leakage (<5nA at +85°C) further extends battery life in always-on monitoring nodes. Power consumption remains stable across temperature, as confirmed by the "Supply Current vs. Temperature" graph (MAX401-8) in the datasheet.