DG381CJ
DG381CJ - CMOS Analog Switch IC | Analog Devices
Analog Devices DG381CJ is a general-purpose CMOS analog switch IC listed in stock at LCSC, with a verified starting price of $1.1653 per unit. The device belongs to the analog-switch category, where CMOS-controlled switches route signals between circuit nodes without continuously conducting current. The verified source identifies the DG381 family as general-purpose CMOS analog switches, while the DG381CJ ordering code is associated with a DIP-14 package. Its detailed supply-voltage rating, channel configuration, on-resistance, leakage current, switching time, and logic thresholds were not included in the supplied data and must be confirmed in the manufacturer datasheet before design release.
A CMOS analog switch is a semiconductor interface device that uses electronic control signals to connect or disconnect an analog signal path. The broader hierarchy is analog switch → analog multiplexer or demultiplexer → interface IC → semiconductor. General-purpose versions are selected when a compact board needs programmable signal routing for instrumentation, test, communications, industrial control, or data-acquisition systems. Unlike a mechanical relay, an analog switch changes state electronically; unlike a continuous analog amplifier, it primarily controls signal-path connectivity.
The most important verified attributes are the in-stock listing, the $1.1653 starting unit price, the general-purpose CMOS technology classification, and the DIP-14 package associated with the ordering code. These attributes support cost-sensitive prototype and production sourcing, but they do not establish electrical interchangeability by themselves. Before using DG381CJ in a precision measurement path, engineers should verify channel count, normally-open or normally-closed behavior, signal polarity, bandwidth, insertion loss, charge injection, off-state isolation, and maximum analog signal excursion.
The DG381 family uses integrated MOS transistors as analog switching elements controlled by CMOS-compatible logic. In a typical circuit, the control pins receive host-generated enable signals while the switched terminals carry analog or digital signals. Because a physical switch has finite resistance, capacitance, leakage, and switching transients, layout and control timing can affect measurement accuracy. The exact architecture, truth table, logic thresholds, and timing values must be taken from the DG381 manufacturer datasheet rather than inferred solely from the distributor listings.
Potential uses include automated test equipment, data-acquisition front ends, industrial sensor interfaces, communication routing, laboratory instrumentation, and embedded control systems where multiple signal paths must be selected under software control. A suitable design must keep every signal and control voltage inside the device's documented limits. It should also provide clean supply decoupling and keep high-impedance routing paths short enough to limit capacitive loading and pickup.
The primary design consideration is verification of the exact DG381CJ electrical table before schematic sign-off. Cross-reference search results describe DG381ACJ+ and DG300ACJ+ as complete replacements with consistent terminals and packages, but the supplied excerpts do not expose their individual voltage, resistance, timing, or leakage ratings. Engineers should therefore treat those parts as candidate drop-ins and compare every operating limit and timing parameter against the authoritative datasheet.
This page consolidates the verified stock and price evidence, candidate pin-compatible replacements, package information, and practical validation guidance into one engineering-focused resource. It also distinguishes confirmed facts from unavailable specifications so procurement and design teams can make a documented decision rather than relying on an incomplete distributor summary.
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