DG381CJ - CMOS Analog Switch IC | Analog Devices
MPN: DG381CJ ✓ ActiveDG381CJ Overview
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.
Drop-in alternatives for DG381CJ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
DG381ACJ+
✅ Drop-In📋 Reference alternative (not in catalog)
DG300ACJ+
✅ Drop-In📋 Reference alternative (not in catalog)
DG381CJ Maximum Ratings & Electrical Characteristics
| Product Type | General-purpose CMOS analog switch IC |
| Manufacturer | Analog Devices |
| Package | DIP-14 |
| Mounting Type | Through-hole |
| Number of Pins | 14 pins |
| Technology | CMOS |
| Verified Starting Unit Price | $1.1653 per unit |
DG381CJ dip-14 Pin Configuration Guide
Pin configuration for DG381CJ (dip-14 package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for DG381CJ.
Refer to the datasheet for full pin configuration.
Typical Applications
DG381CJ is suitable for 6 applications: Automated Test Equipment Signal Routing, Data-Acquisition Channel Selection, Industrial Sensor Interface Routing, Laboratory Instrument Input Selection, Communication Signal Path Selection, Embedded Control Signal Multiplexing.
Automated Test Equipment Signal Routing
DG381CJ is a candidate for automated test equipment that sequentially connects sources, meters, or loads to a device under test. Its general-purpose CMOS analog-switch classification makes it relevant to compact routing matrices, but the supplied evidence does not disclose on-resistance, leakage, bandwidth, or switching time. Before adoption, verify that every switched signal remains inside the absolute maximum ratings and that switch resistance meets the measurement budget. Place the device close to the routed nodes to minimize capacitive pickup, use a stable control reference, and compare DG381ACJ+ and DG300ACJ+ against the manufacturer timing and leakage tables.
Recommended
Data-Acquisition Channel Selection
DG381CJ can be evaluated for data-acquisition front ends that require software-controlled selection among multiple sensors or measurement channels. The general-purpose CMOS switch designation supports this use conceptually, while the verified data does not confirm input count, leakage, charge injection, or bandwidth. Engineers should calculate the measurement error caused by on-resistance and off-state leakage, then ensure the control states do not exceed the switch's logic thresholds. High-impedance sensor lines should be guarded and kept short, while sensitive analog sections need local bypassing and protection from electrostatic discharge.
Recommended
Industrial Sensor Interface Routing
DG381CJ is suitable for preliminary evaluation in industrial control boards that route sensor signals, test points, or actuator-control lines through a programmable analog switch. Because industrial environments can introduce large transients and ground-potential differences, the design must verify the device's supply limits, maximum analog signal voltage, logic levels, and power dissipation from the datasheet. The DIP-14 format supports through-hole prototypes and legacy-style control boards. Add protection networks that do not distort the intended signal, maintain a common ground reference, and test the switch under the worst-case input slew and control transition conditions.
Recommended
Laboratory Instrument Input Selection
DG381CJ can be considered for laboratory instruments that use analog switches to select measurement inputs, calibration sources, or instrument buses under embedded control. Its general-purpose CMOS architecture is relevant where a compact DIP-14 implementation is preferred, but accuracy cannot be inferred from the category alone. Review the datasheet for resistance, isolation, noise, charge injection, and switching-time limits, and include these effects in the error budget for precision measurements. Keep sensitive nodes short, use stable reference grounding, and validate every control sequence during power-up, reset, and fault conditions.
Recommended
Communication Signal Path Selection
DG381CJ may be evaluated for communication equipment that requires switching between low-frequency control, status, or auxiliary signal paths rather than high-speed RF channels. The verified classification does not establish RF bandwidth, insertion loss, or isolation, so this application must remain conditional on those datasheet ratings. Use the switch only for signals covered by its specified frequency and amplitude limits, provide a clean supply rail, and account for control-line crosstalk when routing adjacent high-speed nets. A thermal and power audit should also confirm that the selected switch state cannot create an unintended path or excessive dissipation.
Recommended
Embedded Control Signal Multiplexing
DG381CJ can be evaluated as a signal multiplexer in embedded control systems that must connect multiple external lines to a processor or peripheral. The DIP-14 package and general-purpose CMOS implementation are compatible with a through-hole prototype, although the supplied data does not confirm the number or topology of switched channels. Engineers must obtain the pinout and truth table, then ensure the host firmware never drives an analog node above the device's maximum voltage. Add pull-down or pull-up control resistors where needed for a defined reset state, and verify that power-on control sequencing cannot create an unsafe transient on the external bus.
Recommended
Recommended Products Summary
Engineering reference data for DG381CJ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DG381ACJ+ | DG300ACJ+ |
|---|---|---|---|
| Package | DIP-14 | DIP-14 - reported consistent package | DIP-14 - reported consistent package |
| Brand | Analog Devices | Maxim Integrated | Maxim Integrated |
Key Differentiators
- Directly verified stock and price baseline (vs DG381ACJ+)
- Reported zero-change terminal replacement (vs DG381ACJ+)
- Second documented package-compatible replacement route (vs DG300ACJ+)
Design Notes
Do not approve the DIP-14 pin assignment from a distributor summary alone. The verified excerpts identify the package but do not show the numbered pins or DG381 truth table. Download the current manufacturer datasheet, confirm the CJ ordering code, and map control, common, and switched terminals before modifying a PCB. This is particularly important because DG381ACJ+ and DG300ACJ+ are described as replacement candidates, but package similarity does not prove identical logic polarity or internal topology.
Route switched analog nodes away from clocks, power-switching nodes, and digital control returns. The exact allowable bandwidth, on-resistance, capacitance, and isolation are unavailable in the supplied data, so calculate them from the authoritative datasheet rather than assuming CMOS switching performance is adequate. Keep high-impedance paths short, maintain a continuous ground reference, and use a grounded guard or shield when leakage and injection could materially affect the measurement.
Confirm the DG381CJ supply range, control-input thresholds, and maximum switched-signal voltage before power-up. Do not apply 5 V control signals or route analog signals above the supply rail unless the datasheet expressly permits it. Decouple the supply close to the device, define a safe state for every control input during reset or brownout, and ensure a faulted external node cannot back-power the switch through its control or signal pins.
Compliance Information
The supplied web results do not contain explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements. AEC-Q100 is marked not_applicable because DG381CJ is an industrial/consumer general-purpose analog switch rather than an automotive-qualified variant in the supplied evidence.
