Analog Devices Inc./Maxim Integrated DG418DK

Overview

DG418DK from Maxim Integrated is a precision, normally open (NO), single-pole/single-throw (SPST) CMOS analog switch designed for bidirectional signal routing in high-fidelity analog paths. It features guaranteed 35Ω max on-resistance, <5nA off-leakage at +85°C, and 10pC max charge injection - enabling low-distortion sample-and-hold and audio switching. It operates from ±4.5V to ±20V bipolar or +10V to +30V single supply, with rail-to-rail signal handling up to ±15.5V.

For engineers reviewing the DG418DK datasheet, DG418DK pinout, DG418DK application, or DG418DK equivalent, key selection criteria include guaranteed R_DS(ON) matching (3Ω max between channels in DG419), on-resistance flatness (4Ω max), ESD tolerance (2000V min), and operation across military temperature range (–55°C to +125°C) in CERDIP package.

Technical Context

The DG418DK implements a silicon-gate CMOS transmission gate architecture with TTL/CMOS-compatible logic control (VL = 5V or V+). Its internal structure ensures symmetrical conduction, low charge injection, and minimal signal-dependent on-resistance variation across the full analog range.

It supports unbalanced supply configurations (e.g., +24V/–5V), requires no external level-shifting for logic inputs when VL is tied to V+, and maintains guaranteed performance over –55°C to +125°C without derating - validated per MIL-STD-883B processing for CERDIP variants.

Key Specifications

Pinout & Package

Package: 8-pin CERDIP (Ceramic Dual In-line Package), hermetically sealed, MIL-STD-883B qualified, 0.300" wide body, lead finish Sn/Pb.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG418DK, ADG1419BRUZ offers lower resistance but lacks extended cold-temperature capability and hermetic packaging, while TS5A23157DCUR provides ultra-low voltage operation but cannot support rail-to-rail ±15V signals or meet MIL-STD-883B reliability requirements.

Availability

DG418DK is available at Aetrix Electronics and suitable for guidance and control systems, military radio signal routing, and precision test equipment requiring stable component supply across extended temperature and long lifecycle programs.

Supply support for DG418DK 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 DG418DK belongs to Maxim's precision analog switch product line, engineered specifically for high-reliability, wide-supply, rail-to-rail signal routing in military, aerospace, and test instrumentation applications.

FAQ

What is the maximum allowable supply voltage difference for DG418DK?

The DG418DK supports a maximum voltage difference of +44V between V+ and V–, as specified in Absolute Maximum Ratings. This allows operation with asymmetric supplies such as +24V/–5V (29V difference) or +30V/0V (30V difference), provided each supply remains within its individual voltage limit relative to V–. Exceeding +44V risks permanent damage.

Does DG418DK require external pull-up resistors on the IN pin?

No, DG418DK does not require external pull-up resistors on the IN pin. Its logic input is TTL/CMOS-compatible with guaranteed recognition of logic high at ≥2.4V (when VL = 5V) or ≥0.7×VL (when VL = V+), and logic low at ≤0.8V. The input leakage current is ±0.5µA max, so direct microcontroller GPIO drive is sufficient without added components.

Can DG418DK operate with VL tied to V+ in single-supply mode?

Yes, DG418DK can operate with VL tied directly to V+ in single-supply mode (+10V to +30V). This configures the logic input for CMOS-level compatibility, where logic high is recognized at ≥0.7×V+ and logic low at ≤0.3×V+. The device maintains full R_DS(ON), leakage, and timing specifications under this configuration per Electrical Characteristics tables.

Is DG418DK pin-compatible with older DG418 variants like DG418DJ?

Yes, DG418DK is pin-compatible with all 8-pin DG418 variants (DG418CJ, DG418DJ, DG418CY, DG418DY) in DIP, SO, and CERDIP packages. The pinout - D, N.C., GND, V+, VL, IN, V–, S - is identical across the family. However, DG418DK adds MIL-STD-883B qualification and extended –55°C to +125°C operation not present in commercial-grade versions.

What is the typical on-capacitance of DG418DK and how does it affect high-frequency performance?

DG418DK exhibits 30pF typical drain-source on-capacitance (C_D(ON)/C_S(ON)) at 1MHz. This capacitance forms a low-pass filter with source/load impedances - for example, with 50Ω source and 50Ω load, it limits –3dB bandwidth to ~106MHz. For RF applications above 10MHz, layout minimization and impedance matching are essential to preserve signal integrity.