DG409DY-T1

Overview

The DG409DY-T1 is a dual 4-channel differential analog multiplexer manufactured by Vishay Siliconix. It connects one of four differential inputs to a common dual output using a 2-bit binary address (A0, A1). The device features break-before-make switching to prevent crosstalk and includes an enable function for stacking multiple units. It operates on single supplies from +5 V to +36 V or dual supplies from ±5 V to ±20 V. Key electrical parameters include a maximum on-resistance of 100 Ω, transition time of 160 ns, charge injection of 20 pC, and supply current of 10 μA. It is housed in a 16-pin narrow SOIC package with an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Break-before-make switching action protects against momentary crosstalk between adjacent channels.
• TTL compatible logic control inputs over the full specified operating temperature range.
• Epitaxial layer prevents latchup during operation.
• Enable function allows resetting the multiplexer to all switches off for stacking devices.

Applications

• High speed data acquisition systems
• Audio signal switching and routing
• Automated test equipment (ATE) systems
• Avionics applications

Procurement Notes

Verify the specific suffix requirements when ordering. The -T1 suffix indicates tape and reel packaging, while the absence of -E3 denotes standard tin/lead finish rather than lead-free compliance. Confirm that the component meets RoHS requirements if necessary, as non-RoHS variants exist within this product family. Ensure the procurement source provides valid traceability documentation for the manufacturing lot.

Selection Notes

Select the DG409DY-T1 for applications requiring differential signal multiplexing with low power consumption. Verify that the system voltage stays within the +5 V to +36 V single supply or ±5 V to ±20 V dual supply limits. Consider the 100 Ω maximum on-resistance and 160 ns transition time for bandwidth and speed constraints. Ensure the PCB layout accommodates the 16-pin narrow SOIC package dimensions.

Part Context

This component belongs to the DG408/DG409 series of high-performance CMOS analog multiplexers. The DG409 specifically provides dual 4-channel differential functionality, distinguishing it from the single-ended 8-channel DG408. Both utilize 44 V silicon-gate CMOS technology to achieve extended absolute maximum voltage ratings and low power dissipation suitable for remote instrumentation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications before considering alternative manufacturers.

FAQ

What is the purpose of the Enable (EN) pin?

The Enable function allows the user to reset the multiplexer/demultiplexer to all switches off, which facilitates stacking several devices together.

How does the DG409 handle channel switching to prevent interference?

It utilizes break-before-make switching action, which protects against momentary crosstalk between adjacent channels during state transitions.

What logic levels are supported by the control inputs?

All control inputs, including address (Ax) and enable (EN), are TTL compatible over the full specified operating temperature range.