Renesas DG445DY

Overview

DG445DY from Intersil is a monolithic quad SPST CMOS analog switch with TTL/CMOS-compatible control inputs, designed for bidirectional signal routing in precision analog systems. It delivers ≤85 Ω ON resistance, <250 ns turn-on time, and ±20 V analog signal handling under ±20 V dual supplies - enabling use in sample-and-hold circuits, data acquisition front-ends, and battery-powered test equipment.

For engineers reviewing the DG445DY datasheet, DG445DY pinout, DG445DY application, or DG445DY equivalent, key selection criteria include logic polarity (active-HIGH switch enable), low charge injection (±1 pC typ), 44 V max supply range, and SOIC-16 packaging compatible with industrial temperature operation (–40°C to +85°C).

Technical Context

The DG445DY implements four independent bilateral analog switches using a high-voltage silicon-gate CMOS process with epitaxial isolation to prevent latch-up. Each channel supports symmetrical AC/bidirectional conduction with minimal r_DS(ON) variation (<10 Ω over ±5 V input range) and low OFF capacitance (4 pF source/drain).

Its logic interface uses VL-referenced digital inputs (0.8 V low / 2.4 V high thresholds) and operates with single-supply (0–12 V) or split-supply (±15 V) configurations. The DG445DY differs from DG444DY solely in inverted logic polarity: INx = HIGH enables switch closure, whereas DG444DY requires LOW.

Key Specifications

Pinout & Package

DG445DY is housed in a 16-lead narrow-body SOIC package (JEDEC MS-012-AC, pkg drawing M16.15), 7.5 mm × 10.3 mm footprint, 1.75 mm max height, with standard 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG445DY, MAX4617ESE+ offers better ON-resistance but sacrifices ±20 V capability and VL-referenced logic; ADG1414BRUZ extends voltage range and logic flexibility at the cost of footprint and BOM cost - making DG445DY optimal for cost-sensitive, ±20 V industrial analog routing.

Availability

DG445DY is available at Aetrix Electronics and suitable for audio switching, data acquisition, and automatic test equipment requiring stable component supply across industrial temperature grades and long-lifecycle production programs.

Supply support for DG445DY 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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and mixed-signal IC designer known for high-reliability interface, power management, and precision signal-chain components.

The DG445DY belongs to Intersil's legacy analog switch product line, engineered specifically for high-fidelity, high-voltage analog signal routing in industrial, test, and medical instrumentation where low distortion, low leakage, and latch-up immunity are mandatory.

FAQ

What is the logic polarity of DG445DY compared to DG444DY?

The DG445DY uses active-HIGH logic: an INx input ≥2.4 V closes the corresponding switch. In contrast, DG444DY uses active-LOW logic (INx ≤0.8 V closes the switch). This functional inversion means they are not interchangeable without modifying control logic. Both share identical analog specifications, pinout, and package - only the truth table differs.

Can DG445DY operate from a single 12 V supply?

Yes, DG445DY supports single-supply operation with V+ = 12 V and V− = 0 V (GND). In this mode, the analog signal range is 0–12 V, r_DS(ON) rises to 160 Ω (max), and t_ON increases to 450 ns (max). VL must still be supplied at 5 V for TTL-compatible logic thresholds. The device remains fully functional for battery-powered or low-voltage industrial applications.

What is the maximum allowable analog signal voltage for DG445DY?

The DG445DY supports analog signals from V− to V+, with absolute maximum ratings of ±20 V on V+ and V− rails. Therefore, the maximum continuous analog signal swing is ±20 V - e.g., –20 V to +20 V - provided V+ = +20 V and V− = –20 V. Exceeding this violates Absolute Maximum Ratings and risks permanent damage, even if clamped by internal diodes.

Does DG445DY require external charge-injection compensation?

No, DG445DY's typical charge injection is only ±1 pC, which is sufficiently low for most sample-and-hold and multiplexer applications without external compensation. Its optimized silicon-gate process minimizes injected charge, allowing direct use with 1 nF hold capacitors and achieving <1 mV step error - eliminating the need for dummy switches or complex correction circuitry in standard implementations.

Is DG445DY pin-compatible with older DG211/DG212 series devices?

Yes, DG445DY is explicitly designed as a drop-in replacement for DG211 and DG212 series switches. It shares identical 16-pin SOIC/TSSOP pinout, logic interface behavior (with polarity match), and mechanical footprint. Key improvements - lower ON resistance (<85 Ω vs. >100 Ω), faster switching (<250 ns vs. >400 ns), and reduced charge injection - are achieved without PCB or schematic changes.