Analog Devices Inc./Maxim Integrated DG445CY+

Overview

DG445CY+ 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 rail-to-rail analog signal handling in test equipment and military radios.

For engineers reviewing the DG445CY+ datasheet, DG445CY+ pinout, DG445CY+ application, or DG445CY+ equivalent, key selection criteria include guaranteed on-resistance matching (4Ω max), on-resistance flatness (9Ω max), ESD tolerance (2000V min), switching speed (tON < 250ns), and TTL/CMOS logic compatibility with VL pin programmability.

Technical Context

The DG445CY+ implements four independent SPST switches fabricated in a 44V silicon-gate process, supporting bidirectional conduction with symmetric on-resistance behavior across the full analog signal range (±15V). Its control architecture uses active-low logic inputs referenced to VL, with internal level-shifting enabling operation under ±20V or +30V supplies while maintaining TTL/CMOS input thresholds.

Switching performance is supply-voltage dependent: tON improves from 400ns at +10.8V to 250ns at +16.5V (bipolar ±16.5V), and off-isolation rejection ratio reaches 60dB at 1MHz. Charge injection is tightly controlled (10pC max) via matched transistor geometry and layout symmetry, critical for sample-and-hold accuracy.

Key Specifications

Pinout & Package

Package: 16-pin narrow SO (Small Outline) - 150mil body width, surface-mount, RoHS-compliant, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1414BRUZ and TS5A3157DCKR, the DG445CY+ uniquely supports ±20V bipolar operation and configurable logic thresholds via VL, making it irreplaceable in wide-dynamic-range test and defense systems where supply flexibility and ruggedness are mandatory.

Availability

DG445CY+ is available at Aetrix Electronics and suitable for test equipment, military radios, sample-and-hold circuits, and heads-up displays requiring stable component supply across extended temperature and voltage ranges.

Supply support for DG445CY+ 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, communications, and computing markets.

The DG445CY+ belongs to Maxim's precision analog switch family, engineered specifically for high-reliability signal routing in demanding environments where leakage, charge injection, and supply flexibility directly impact measurement fidelity and system uptime.

FAQ

What is the maximum analog signal voltage range supported by the DG445CY+?

The DG445CY+ supports an analog signal range of ±15V when operated from ±15V supplies, and scales linearly with supply rails - up to ±20V with ±20V supplies or +30V with single +30V supply. The absolute maximum voltage difference between V+ and V− is 44V, and signals on S/D pins must remain within V− to V+ to avoid forward-biasing internal clamping diodes. This range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official Maxim datasheet for DG445CY+.

Does the DG445CY+ require external pull-up or pull-down resistors on its IN pins?

No, the DG445CY+ does not require external pull-up or pull-down resistors on IN1–IN4 pins. Its logic inputs have specified I_INH and I_INL leakage currents of ±0.5µA max, and are fully compatible with standard TTL/CMOS drivers when VL is set to 5V or V+. Internal input structure ensures clean switching without floating inputs, provided the driving source meets the voltage thresholds (VINH ≥ 2.4V, VINL ≤ 0.8V) defined in the DG445CY+ datasheet under dual-supply conditions.

Can the DG445CY+ operate with unbalanced supplies such as +24V and −5V?

Yes, the DG445CY+ can operate with unbalanced supplies like +24V and −5V, as explicitly stated in the Applications Information section of the DG445CY+ datasheet. The key constraint is that the voltage difference between V+ and V− must not exceed 44V, and analog signals must stay within the V− to V+ range. In this example, the usable analog range becomes −5V to +24V (29V span), and the device maintains specified R_DS(ON), leakage, and switching performance per the Electrical Characteristics table.

What is the purpose of the VL pin on the DG445CY+, and how should it be connected?

The VL pin on the DG445CY+ sets the logic threshold voltage for the IN1–IN4 inputs. Connect VL to +5V for TTL-compatible operation (VINH ≥ 2.4V, VINL ≤ 0.8V), or tie it to V+ for CMOS-level compatibility with higher supply voltages. This flexibility allows the DG445CY+ to interface directly with diverse controllers without level-shifting circuitry. The VL pin is internally buffered and draws negligible current, as verified in the DG445CY+ Electrical Characteristics table under "Input Current with Input Voltage High/Low" parameters.

How does the DG445CY+ compare to the older DG445CJ in terms of performance and package?

The DG445CY+ and DG445CJ share identical electrical specifications - including R_DS(ON), charge injection, leakage, and switching times - because both are members of Maxim's improved DG444/DG445 family. The sole difference is packaging: DG445CY+ uses a 16-pin narrow SO (surface-mount), while DG445CJ uses a 16-pin plastic DIP (through-hole). The "+" suffix in DG445CY+ denotes tape-and-reel packaging with enhanced moisture sensitivity level (MSL) compliance, per Maxim's ordering conventions documented in the DG445CY+ datasheet's Ordering Information table.