Analog Devices Inc./Maxim Integrated DG444DJ

Overview

DG444DJ from Maxim Integrated is a quad, normally closed (NC), single-pole/single-throw (SPST) analog switch IC designed for precision signal routing in bipolar and single-supply systems. It delivers 85Ω max on-resistance, <5nA off-leakage at +85°C, 10pC max charge injection, and operates from ±4.5V to ±20V or +10V to +30V supplies - enabling use in military radios and battery-operated test equipment.

For engineers reviewing the DG444DJ datasheet, DG444DJ pinout, DG444DJ application, or DG444DJ equivalent, key selection criteria include guaranteed R_ON matching (4Ω max), rail-to-rail analog signal handling (±15V), TTL/CMOS logic compatibility, and -40°C to +85°C industrial temperature rating.

Technical Context

The DG444DJ implements four independent NC SPST switches fabricated using a 44V silicon-gate process. Each channel guarantees matched on-resistance (≤4Ω) and flat on-resistance (≤9Ω) over the full ±15V analog signal range under bipolar supply operation.

It supports dual-supply (±4.5V to ±20V) or single-supply (+10V to +30V) biasing, with VL pin configurable for TTL (5V) or CMOS (V+) logic-level compatibility. Switching times are ≤250ns t_ON and ≤70ns t_OFF at ±16.5V supplies.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (dual in-line package), through-hole mount, 0.3-inch body width, -40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1414BRUZ and TS5A3157DCKR, the DG444DJ uniquely combines quad NC topology, wide ±20V/30V supply support, programmable logic threshold (VL), and guaranteed -40°C to +85°C leakage performance - making it irreplaceable in ruggedized, bipolar-signal, fail-safe routing applications.

Availability

DG444DJ is available at Aetrix Electronics and suitable for military radios, battery-operated test equipment, and heads-up display systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG444DJ 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 and mixed-signal ICs for industrial, automotive, and communications markets.

The DG444DJ belongs to Maxim's precision analog switch product line, engineered for high-voltage signal integrity, low distortion, and reliability in mission-critical instrumentation and defense systems.

FAQ

What is the default switch state of DG444DJ when no logic signal is applied?

The DG444DJ features normally closed (NC) switches - meaning all four channels conduct by default when IN1–IN4 are unconnected or held at logic low (0V). This fail-safe behavior ensures signal continuity during power-up, reset, or controller fault conditions. The DG444DJ remains in this state until a valid logic high (≥2.4V with VL = 5V) is applied to an IN pin to open the corresponding switch.

Can DG444DJ operate with unbalanced supplies like +24V and -5V?

Yes, DG444DJ supports unbalanced supplies such as +24V and -5V, provided the absolute difference between V+ and V− does not exceed 44V and each supply stays within its absolute maximum rating (V+ ≤ 44V, V− ≥ -25V referenced to GND). This capability allows flexible power architecture design in systems with asymmetric rails, and the DG444DJ maintains specified R_ON, leakage, and switching performance under these conditions.

How does the VL pin affect logic compatibility in DG444DJ?

The VL pin on DG444DJ sets the logic threshold voltage: connecting VL to 5V configures the device for TTL-compatible inputs (logic high ≥2.4V), while tying VL to V+ enables CMOS-level recognition (logic high ≥70% of V+). This dual-mode flexibility eliminates external level shifters when interfacing with mixed-voltage controllers, and the DG444DJ's internal circuitry ensures consistent switching behavior regardless of VL configuration.

Is DG444DJ pin-compatible with legacy DG444 devices?

Yes, DG444DJ is pin-compatible and functionally identical to earlier DG444 variants (e.g., DG444CJ, DG444CY) in the same 16-pin DIP package, including identical pinout, electrical specifications, and thermal characteristics. The "DJ" suffix denotes the -40°C to +85°C temperature grade, and the DG444DJ can directly replace older versions in existing designs without layout or firmware changes.

What is the maximum analog signal voltage DG444DJ can switch without damage?

DG444DJ guarantees safe operation with analog signals ranging from V− to V+, up to ±15V (i.e., -15V to +15V) when powered from ±15V supplies. Exceeding V+ or V− at any S or D terminal - even with power off - risks latch-up or permanent damage due to internal ESD diode conduction. Therefore, the DG444DJ's absolute maximum analog signal range is strictly bounded by its supply rails, and external clamping is required for overvoltage protection.