Analog Devices Inc./Maxim Integrated DG442DK

Overview

DG442DK 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 features 85Ω max on-resistance, <5nA off-leakage at +85°C, 10pC max charge injection, rail-to-rail analog signal handling (±15.5V), and TTL/CMOS-compatible logic inputs - enabling use in test equipment front-ends and battery-powered instrumentation.

For engineers reviewing the DG442DK datasheet, DG442DK pinout, DG442DK application, or DG442DK equivalent, key selection criteria include guaranteed on-resistance matching (4Ω max between channels), on-resistance flatness (9Ω max over signal range), ESD tolerance (2000V min per Method 3015.7), dual-supply operation (±4.5V to ±20V), and CERDIP packaging for high-reliability industrial and military environments.

Technical Context

The DG442DK implements four independent SPST switches with complementary logic control: logic "1" closes all channels. Its silicon-gate 44V process ensures robust operation across wide supply ranges and temperature extremes (–40°C to +85°C). Each switch conducts bidirectionally with matched r_DS(ON) and low flatness variation - critical for multiplexed measurement accuracy.

Charge injection is tightly controlled (10pC max) to minimize voltage glitches in sample-and-hold circuits, while off-isolation rejection ratio exceeds 60dB at 1MHz. The device supports unbalanced supplies (e.g., +24V/–5V), and internal clamping diodes protect S/D terminals against overvoltage when external diodes are omitted.

Key Specifications

Pinout & Package

Package: 16-pin CERDIP (J16-3), hermetically sealed ceramic dual-in-line package rated for –40°C to +85°C operation, with exposed substrate connection via Pin 13 (V+).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG442BRZ and TS5A3157DCKR, the DG442DK delivers superior charge injection performance and hermetic CERDIP packaging for harsh environments - making it the only option supporting simultaneous requirements of rail-to-rail analog range, <5nA leakage at +85°C, and MIL-grade reliability.

Availability

DG442DK is available at Aetrix Electronics and suitable for automated test equipment, military radio subsystems, precision sample-and-hold circuits, battery-powered instrumentation, and heads-up display signal routing requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for DG442DK 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 demanding industrial, automotive, and communications applications.

The DG442DK belongs to Maxim's precision analog switch product line, engineered for signal integrity-critical applications including test equipment, avionics, and ruggedized instrumentation where leakage, matching, and ESD robustness are non-negotiable.

FAQ

What is the maximum analog signal range supported by the DG442DK?

The DG442DK supports a rail-to-rail analog signal range of ±15.5V when operated from ±15V supplies, and up to ±20V with ±20V supplies. This is defined by the absolute maximum ratings for V_D and V_S (±15.5V at ±15V V+/V−), ensuring full-scale transducer or DAC output compatibility without external level shifting. The DG442DK maintains this range across its full –40°C to +85°C operating temperature window.

Does the DG442DK require external protection diodes for overvoltage conditions?

The DG442DK includes internal clamping diodes on all S and D pins, limiting forward current to safe levels if signals exceed V+ or V−. External diodes are optional and recommended only when strict power-supply sequencing cannot be guaranteed - for example, in systems where V− may power up before V+. Adding external diodes reduces the usable analog range by ~1V but does not affect the DG442DK's on-resistance or leakage specifications.

How does the DG442DK's on-resistance matching benefit multiplexed data acquisition systems?

The DG442DK guarantees ≤4Ω on-resistance mismatch between its four SPST channels. In a 16-channel multiplexer built using four DG442DKs, this tight matching ensures uniform gain scaling across all paths, reducing channel-to-channel gain error to <0.5% - eliminating the need for per-channel calibration in high-accuracy 16-bit data loggers and medical sensor interfaces where the DG442DK is commonly deployed.

Can the DG442DK operate from unbalanced supply voltages such as +24V and –5V?

Yes, the DG442DK supports unbalanced supplies as long as the difference between V+ and V− does not exceed +44V and both rails remain within their absolute maximum ratings (V+ ≤ 44V referenced to V−, GND ≤ 25V referenced to V−). Operation from +24V/–5V is explicitly validated in the datasheet and maintains full specification compliance for r_DS(ON), leakage, and switching speed - making the DG442DK suitable for hybrid power architectures in industrial PLC modules.

What is the significance of the N.C. pin (Pin 16) on the DG442DK CERDIP package?

Pin 16 on the DG442DK is labeled N.C. (Not Internally Connected) and has no bond wire or internal circuit connection. It must be left floating - neither tied to V+, GND, nor any other node. This pin exists for mechanical symmetry and package compatibility with other members of the DG441/DG442 family (e.g., DG441DK), but carries zero electrical function. Incorrect routing of Pin 16 will not damage the DG442DK but may compromise PCB layout integrity.