Analog Devices Inc./Maxim Integrated DG444DY+

Overview

DG444DY+ from Maxim Integrated is a quad, normally closed (NC), single-pole/single-throw (SPST) analog switch IC designed for precision signal routing in bipolar or single-supply systems. It delivers 85Ω max on-resistance, 4Ω max on-resistance matching between channels, <5nA off-leakage at +85°C, and rail-to-rail analog signal handling up to ±15V. It is used in test equipment, military radios, and audio signal routing where low charge injection (10pC max) and high off-isolation (60dB) are critical.

For engineers reviewing the DG444DY+ datasheet, DG444DY+ pinout, DG444DY+ application, or DG444DY+ equivalent, key selection considerations include its -40°C to +85°C industrial temperature rating, 16-pin narrow SO package, guaranteed R_FLAT(ON) ≤9Ω over signal range, TTL/CMOS logic compatibility, and bipolar supply operation from ±4.5V to ±20V.

Technical Context

The DG444DY+ implements four independent NC SPST switches fabricated using a 44V silicon-gate process, enabling robust operation with supply voltages up to ±20V or +30V. Its channel-matched on-resistance (≤4Ω) and flat on-resistance profile (≤9Ω variation across ±15V signal range) support precision instrumentation and sample-and-hold circuits requiring minimal gain/offset error.

It features low dynamic parameters: t_ON <250ns and t_OFF <70ns under ±16.5V supplies, plus 10pC max charge injection and 4pF off-capacitance per terminal - critical for minimizing glitch energy and crosstalk in multiplexed data acquisition systems.

Key Specifications

Pinout & Package

Package: 16-pin narrow SO (Small Outline), JEDEC MS-012AC, body size 10.3 mm × 5.3 mm, 1.75 mm height, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG444DY+, MAX4674ESE+ offers better charge injection but lacks NC default state, while ADG1414BRUZ provides significantly lower R_DS(ON) and leakage but requires PCB redesign due to non-pin-compatible layout and higher unit cost.

Availability

DG444DY+ is available at Aetrix Electronics and suitable for test equipment, military communications, and audio routing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG444DY+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DG444DY+ belongs to Maxim's precision analog switch family, engineered for applications demanding low on-resistance variation, high off-isolation, and robust operation in bipolar supply environments.

FAQ

What is the operating temperature range for the DG444DY+?

The DG444DY+ is rated for industrial operation from −40°C to +85°C. This range is confirmed in the Ordering Information table and validated across all electrical specifications including off-leakage current (<5nA at +85°C), on-resistance, and switching times. The "DY" suffix explicitly denotes this extended temperature grade, distinguishing it from the commercial-grade "CY" variant (0°C to +70°C).

Is the DG444DY+ a normally open or normally closed switch?

The DG444DY+ is a normally closed (NC) analog switch. As stated in the General Description: "The DG444 has four normally closed switches and the DG445 has four normally open switches." This NC behavior means each switch conducts between source (S) and drain (D) terminals when its corresponding IN pin is logic low (0V), and opens when IN is logic high (≈5V with VL = 5V).

What supply voltage configurations does the DG444DY+ support?

The DG444DY+ supports both bipolar (±4.5V to ±20V) and single-supply (+10V to +30V) operation. In bipolar mode, V+ and V− pins accept symmetric or asymmetric rails (e.g., +24V/−5V); in single-supply mode, V− is tied to ground. The analog signal range scales accordingly - up to ±15V with ±15V supplies, or 0V to +15V with +15V/V−=0V. VL must be set to 5V for TTL compatibility or to V+ for CMOS thresholds.

Does the DG444DY+ require external protection diodes for overvoltage conditions?

External blocking diodes are optional and recommended only if strict power-supply sequencing cannot be guaranteed. The DG444DY+ includes internal clamp diodes from S/D/IN pins to V+ and V−, but exceeding absolute maximum ratings (e.g., >44V between V+ and V−, or signals beyond V+/V− rails) risks permanent damage. When diodes are added per Figure 1, the analog signal range reduces by ~1V, but on-resistance and leakage remain unaffected.

How is logic compatibility achieved on the DG444DY+ control inputs?

Logic compatibility is configured via the VL pin: connecting VL to +5V sets TTL-compatible thresholds (V_INH ≥2.4V, V_INL ≤0.8V), while tying VL to V+ enables CMOS-level operation (V_INH ≥0.7×V+, V_INL ≤0.3×V+). Input currents are tightly controlled (±0.5µA max), ensuring minimal loading on driving logic. The DG444DY+ accepts standard 3.3V or 5V logic signals when VL = 5V, and supports higher-voltage logic when VL = V+.