Analog Devices Inc./Maxim Integrated DG445CJ

Overview

DG445CJ 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, rail-to-rail analog signal handling (±15V), and TTL/CMOS-compatible logic control - enabling high-fidelity switching in test equipment and military radios.

For engineers reviewing the DG445CJ datasheet, DG445CJ pinout, DG445CJ application, or DG445CJ 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), dual-supply operation (±4.5V to ±20V), and 16-pin plastic DIP packaging for through-hole prototyping and legacy system upgrades.

Technical Context

The DG445CJ implements four independent SPST switches with NO configuration, controlled by separate digital inputs (IN1–IN4). Each switch features symmetrical conduction (bidirectional signal flow), low distortion due to flat on-resistance across the full analog range, and internal clamping diodes protecting S/D terminals against overvoltage relative to V+ or V−.

It operates from either bipolar supplies (±4.5V to ±20V) or single supplies (+10V to +30V), with VL pin configurable for TTL (5V) or CMOS (V+) logic thresholds. Switching times are specified at <250ns tON and <70ns tOFF under ±16.5V conditions, and leakage performance is 100% tested at maximum hot temperature.

Key Specifications

Pinout & Package

Package: 16-pin plastic DIP (dual in-line package), 0°C to +70°C operating temperature range, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG445BNZ and MAX4617CPD+, the DG445CJ uniquely combines 0°C to +70°C commercial temperature grade, full ±20V bipolar supply support, and guaranteed 4Ω on-resistance matching - making it optimal for legacy test gear upgrades and military radio spares requiring exact form-fit-function replacement.

Availability

DG445CJ is available at Aetrix Electronics and suitable for test equipment, military radios, sample-and-hold circuits, and battery-operated systems requiring stable component supply and long-term obsolescence management.

Supply support for DG445CJ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and defense applications.

The DG445CJ belongs to Maxim's legacy precision analog switch family, engineered specifically for high-reliability signal routing in environments demanding low leakage, low distortion, and robust ESD immunity - especially in military and aerospace systems.

FAQ

What is the maximum analog signal voltage range supported by the DG445CJ?

The DG445CJ supports an analog signal range of ±15V when operated from ±15V supplies. Its absolute maximum ratings allow V+ up to +44V and V− down to –44V referenced to V−, but the usable linear signal swing remains bounded by the supply rails. This rail-to-rail capability makes DG445CJ suitable for interfacing with ±12V or ±15V op-amps and data converters without external level shifting.

Does the DG445CJ require external pull-up or pull-down resistors on its IN1–IN4 pins?

No, the DG445CJ does not require external pull-up or pull-down resistors on IN1–IN4. Its logic inputs are TTL/CMOS compatible with defined thresholds (VINH = 2.4V min, VINL = 0.8V max) and exhibit low input current (±0.5µA max). However, floating inputs must be avoided - each IN pin should be driven actively high or low to ensure deterministic switch states and prevent increased supply current or undefined operation.

Can the DG445CJ operate with unbalanced supplies such as +24V and –5V?

Yes, the DG445CJ can operate with unbalanced supplies like +24V and –5V, provided the difference between V+ and V− does not exceed +44V and both remain within absolute maximum ratings. The analog signal range adjusts accordingly (e.g., –5V to +24V), and performance parameters such as R_DS(ON) and leakage are validated across the specified bipolar and single-supply ranges - confirming DG445CJ's flexibility in non-standard power architectures.

How is charge injection specified for the DG445CJ, and why does it matter in precision circuits?

Charge injection for the DG445CJ is specified as 10pC maximum, measured at V+ = 15V, V− = –15V, and CL = 1nF. This parameter quantifies the net charge dumped onto the load capacitance during switching transitions. In precision sample-and-hold or switched-capacitor circuits, excessive charge injection causes voltage glitches and settling errors - so the 10pC max of DG445CJ directly enables accurate sub-12-bit acquisition without additional correction circuitry.

Is the DG445CJ pin-compatible with the original industry-standard DG445 device?

Yes, the DG445CJ is a plug-in upgrade for the industry-standard DG445, sharing identical pinout, package (16-pin plastic DIP), and logic functionality. It improves upon the original with tighter on-resistance matching (4Ω vs. unspecified), guaranteed on-resistance flatness (9Ω max), lower off-leakage (<5nA at +85°C), and enhanced ESD tolerance (2000V min). No PCB changes are required when replacing legacy DG445 units with DG445CJ in existing designs.