Analog Devices Inc./Maxim Integrated DG302ACJ+

Overview

DG302ACJ+ from Maxim Integrated is a dual DPST (double-pole, double-throw) CMOS analog switch optimized for low-power, precision signal routing in bipolar supply systems. It features <50Ω on-resistance, ±15V analog signal range (V+ to V−), 150ns turn-on time, and break-before-make switching - enabling reliable channel isolation in portable instrumentation and programmable gain amplifiers.

For engineers reviewing the DG302ACJ+ datasheet, DG302ACJ+ pinout, DG302ACJ+ application, or DG302ACJ+ equivalent, this device supports ±5V to ±18V dual-supply operation, TTL/CMOS-compatible control inputs, low charge injection (12pC), and single-supply capability (V− = GND) - critical for battery-powered sample/hold and telemetry circuits.

Technical Context

The DG302ACJ+ implements monolithic CMOS switch architecture with latchup-proof construction and fully independent dual DPST channels. Each channel supports bidirectional analog signal switching across the full V+ to V− rail, with matched on-resistance (<50Ω typ) and <10% inter-channel R_DS(ON) matching.

Its logic interface accepts TTL/CMOS voltage levels (0.8V/4.0V thresholds), delivers <1nA off-leakage at ±14V, and guarantees break-before-make timing (50ns min interval) - essential for preventing signal shorting during state transitions in process control multiplexers.

Key Specifications

Pinout & Package

Package: 14-lead plastic DIP (0.300" wide), JEDEC MS-001, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4672CPE+ and ADG5421FBRUZ, the DG302ACJ+ offers lowest on-resistance and DIP-14 compatibility for legacy designs, while lacking integrated protection or extended temperature rating - making it optimal for cost-sensitive, space-constrained portable instrumentation where signal integrity is prioritized.

Availability

DG302ACJ+ is available at Aetrix Electronics and suitable for portable instrumentation, low-power sample/holds, programmable gain amplifiers, process control telemetry, and SPDT/DPDT signal routing requiring stable component supply and long-term obsolescence management.

Supply support for DG302ACJ+ 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 consumer applications.

The DG302ACJ+ belongs to the DG300A family of TTL-compatible CMOS analog switches, designed specifically for low-power, rail-to-rail signal routing in battery-operated and precision measurement systems.

FAQ

What is the maximum supply voltage range supported by the DG302ACJ+?

The DG302ACJ+ operates with dual supplies from ±5V to ±18V. Its absolute maximum ratings allow V+ up to +44V and V− down to −44V for DG300A-series devices, but functional operation is specified only up to ±18V. For single-supply use, connect V− to GND and apply +10V to +30V to V+ - ensuring analog signals remain within the V+ to V− rails. This flexibility makes DG302ACJ+ suitable for both portable and industrial power architectures.

Does the DG302ACJ+ support break-before-make switching, and how is it implemented?

Yes, the DG302ACJ+ guarantees break-before-make operation with a minimum 50ns interval between turn-off of one switch and turn-on of the other in DPST mode. This timing is inherent to its CMOS gate drive architecture and is verified in the datasheet's Break-Before-Make Time Test Circuit (Figure 2). It prevents momentary shorting between throw terminals - critical in applications like relay replacement and multiplexer-based signal routing where channel crosstalk must be avoided.

What is the typical on-resistance matching between the two DPST channels of the DG302ACJ+?

The DG302ACJ+ exhibits typical on-resistance matching of ≤10% between its two independent DPST channels. This specification is confirmed in the Applications Information section and supports precision applications such as programmable gain amplifiers, where mismatched R_DS(ON) would introduce gain errors across switch configurations. Matching holds across temperature and supply voltage variations, contributing to stable performance in calibrated systems.

Can the DG302ACJ+ be used with single-supply systems, and what are the key considerations?

Yes, the DG302ACJ+ supports single-supply operation by connecting V− to GND and applying +10V to +30V to V+. In this configuration, the analog signal range becomes 0V to V+, and logic inputs retain TTL/CMOS compatibility (0.8V/4.0V thresholds). Key considerations include ensuring analog inputs stay within 0V to V+, verifying that charge injection (12pC) remains acceptable for the hold capacitor size, and confirming that off-isolation (62dB) meets system crosstalk requirements - all validated in Table 1 of the datasheet.

How does the charge injection specification of the DG302ACJ+ impact sample/hold circuit design?

The DG302ACJ+ specifies 12pC typical charge injection, measured with ±15V supplies and 0V analog input. In sample/hold applications, this injected charge creates a voltage step error on the hold capacitor: ΔV = Q/C. For example, with a 10nF capacitor, the error is ≤1.2mV - supporting 12-bit accuracy. Designers should minimize stray capacitance at switch outputs and avoid high-impedance nodes before the hold capacitor to prevent error amplification. The value is confirmed in Figure 1 and Table 2 of the DG302ACJ+ datasheet.