Analog Devices Inc./Maxim Integrated DG445CJ+

Overview

DG445CJ+ from Maxim Integrated is a quad, normally open (NO), 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, <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 test equipment front-ends and battery-powered instrumentation.

For engineers reviewing the DG445CJ+ datasheet, DG445CJ+ pinout, DG445CJ+ application, or DG445CJ+ equivalent, key selection criteria include guaranteed R_ON matching (4Ω max), rail-to-rail analog signal handling (±15V), TTL/CMOS logic compatibility, and ESD tolerance of 2000V per Method 3015.7.

Technical Context

The DG445CJ+ implements four independent SPST switches with complementary control logic: logic high closes the switch (NO configuration). Its silicon-gate 44V process ensures robust operation across wide supply ranges and temperature extremes (0°C to +70°C).

Switching performance is characterized by t_ON < 250ns and t_OFF < 70ns under ±16.5V supplies, while low dynamic charge injection (10pC max) and flat on-resistance over signal range (9Ω max R_FLAT(ON)) support high-fidelity sample-and-hold and multiplexed ADC input stages.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (0.300" width), RoHS-compliant, through-hole mountable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1414BRUZ and TS5A23157DGSR, the DG445CJ+ uniquely balances high-voltage operation (+30V), DIP package availability, and production-proven reliability in military and industrial environments - making it the preferred choice for legacy-compatible, wide-supply analog routing.

Availability

DG445CJ+ is available at Aetrix Electronics and suitable for test equipment, portable instrumentation, heads-up displays, and military radio systems requiring stable component supply and long-term obsolescence management.

Supply support for DG445CJ+ 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 markets.

The DG445CJ+ belongs to Maxim's legacy analog switch family engineered for rugged, high-precision signal routing in demanding environments - emphasizing low leakage, ESD resilience, and wide supply flexibility over raw speed.

FAQ

What is the maximum analog signal voltage range supported by the DG445CJ+?

The DG445CJ+ supports an analog signal range of ±15V when operated from ±15V supplies. This rail-to-rail capability is guaranteed across its full operating temperature range (0°C to +70°C) and enables direct interfacing with standard industrial op-amps and ADC drivers without level shifting. The device's absolute maximum ratings allow V+ up to +44V referenced to V−, but signal swing remains bounded by the applied supply rails.

Does the DG445CJ+ require a separate logic supply voltage (VL), and what are the options?

Yes, the DG445CJ+ requires a dedicated VL pin (Pin 12) to set logic threshold levels. VL must be connected to +5V for TTL-compatible operation (input high ≥2.4V) or tied to V+ for CMOS-level compatibility (input high ≥70% of V+). Leaving VL unconnected or floating will result in undefined switching behavior and potential damage. The DG445CJ+ does not derive logic thresholds from V+ or GND alone.

How does the DG445CJ+ handle power-off conditions, and is there risk of signal backfeed?

When power is removed, all DG445CJ+ switches open automatically due to internal depletion-mode structure - preventing unintended signal conduction. However, analog signals on D or S pins must never exceed V+ or V−, even with power off, as internal clamping diodes could forward-bias and cause backfeed or latch-up. External series resistors or blocking diodes are recommended if off-state signal excursions beyond supply rails are possible.

Can the DG445CJ+ be used with unbalanced supplies, such as +24V and −5V?

Yes, the DG445CJ+ explicitly supports unbalanced supplies like +24V and −5V, as confirmed in the Applications Information section. The key constraint is that the total voltage difference (V+ − V−) must not exceed +44V, and analog signals must remain within the resulting rail-to-rail span (e.g., −5V to +24V = 29V range). Performance parameters such as R_DS(ON) and leakage are specified under balanced conditions but remain functional across validated unbalanced configurations.

What is the thermal performance of the DG445CJ+ in its 16-pin DIP package at maximum ambient temperature?

In its 16-pin plastic DIP package, the DG445CJ+ has a thermal resistance θ_JA of 10.53°C/W and a maximum continuous power dissipation of 842mW at +70°C ambient. Derating is linear above +70°C (−10.53mW/°C). At full rated operation (e.g., 4 channels conducting 10mA each at 85Ω), power dissipation remains well below this limit, ensuring reliable operation without heatsinking in standard industrial enclosures.