Analog Devices Inc./Maxim Integrated DG418DY

Overview

DG418DY from Maxim Integrated is a precision CMOS single-pole/single-throw (SPST) analog switch with normally open configuration, 35Ω max on-resistance, <5nA off-leakage at +85°C, and 175ns max turn-on time. It operates from ±4.5V to ±20V bipolar or +10V to +30V single supply and is used in battery-operated systems requiring rail-to-rail signal handling and low charge injection.

For engineers reviewing the DG418DY datasheet, DG418DY pinout, DG418DY application, or DG418DY equivalent, key selection criteria include guaranteed on-resistance matching (3Ω max), flatness over signal range (4Ω max), ESD tolerance (2000V min), and compatibility with TTL/CMOS logic levels across industrial temperature range.

Technical Context

The DG418DY implements a silicon-gate CMOS process enabling rail-to-rail analog signal switching with bidirectional conduction and low charge injection (10pC max). Its control architecture accepts logic-level inputs referenced to VL (5V) and supports unbalanced supplies such as +24V/–5V.

It features internal diode clamping on S/D terminals for overvoltage protection and guarantees parametric performance across –40°C to +85°C, including off-leakage <5nA at max temperature and on-resistance flatness ≤4Ω over full analog range under bipolar operation.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), surface-mount, JEDEC MS-012AC compliant, body size 4.9mm × 3.9mm × 1.75mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG418DY, ADG1418BRMZ offers lower on-resistance but sacrifices bipolar supply flexibility and guaranteed flatness, while TS5A23157DCUR provides higher speed at 5V only but lacks industrial temperature validation and leakage guarantees-making DG418DY uniquely suited for precision, wide-supply, extended-temperature analog routing.

Availability

DG418DY is available at Aetrix Electronics and suitable for battery-operated systems, test equipment, and communications systems requiring stable component supply across industrial temperature ranges and long-term BOM continuity.

Supply support for DG418DY 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 precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The DG418DY belongs to Maxim's legacy DG417/DG418/DG419 family of precision analog switches, engineered specifically for high-fidelity signal routing where on-resistance matching, low leakage, and rail-to-rail operation are mandatory.

FAQ

What is the operating temperature range for DG418DY?

The DG418DY is specified for operation from –40°C to +85°C. This industrial temperature grade is confirmed in the Ordering Information table and validated by leakage current testing at +85°C (<5nA). The device uses a silicon-gate process optimized for stability across this full range, making DG418DY suitable for deployment in harsh environments like factory automation and outdoor communications hardware.

Does DG418DY support bipolar power supplies?

Yes, DG418DY supports bipolar supplies from ±4.5V to ±20V, as explicitly stated in both the General Description and Electrical Characteristics sections. Operation at ±15V is fully characterized, and parameters like R_DS(ON) flatness (4Ω max) and on-resistance match (3Ω max) are guaranteed only under bipolar conditions. This makes DG418DY appropriate for legacy test equipment and military radios requiring true dual-rail analog signal handling.

What is the maximum analog signal voltage range supported by DG418DY?

The DG418DY supports analog signals from V− to V+, with absolute maximum ratings of V+ ≤ 44V referenced to V−. Under ±15V operation, the usable analog range is ±15.5V; under +12V/0V single supply, it is 0V to 12V. This rail-to-rail capability is confirmed in the "Existing Features" list and verified in Typical Operating Characteristics graphs (DG417-03 and DG417-04), ensuring full dynamic range utilization without clipping.

Is DG418DY pin-compatible with older DG418 variants?

Yes, DG418DY shares identical 8-pin SOIC pinout and functional behavior with all DG418 variants (e.g., DG418CJ, DG418DJ), as shown in the Pin Configurations diagram and Pin Description table. The "Y" suffix denotes SO package and –40°C to +85°C rating, but electrical functionality, pin mapping, and truth table (logic-high = ON) remain unchanged across the DG418 family, enabling drop-in replacement in existing designs.

How does DG418DY achieve low charge injection, and why does it matter?

DG418DY achieves ≤10pC max charge injection via matched transistor geometry and optimized gate drive in its silicon-gate CMOS process, as noted in the "New Features" section. This low value prevents voltage glitches on hold capacitors in sample-and-hold circuits-critical for maintaining accuracy in 12-bit+ data acquisition systems where even 1pC can induce >1LSB error at common capacitance values (e.g., 1000pF).