DG309BDY

Overview

The DG309BDY is a quad single-pole single-throw (SPST) analog switch from Vishay Siliconix, housed in a 16-pin Narrow SOIC package. It operates with dual supplies ranging from ±4 V to ±22 V or a single supply up to 44 V. The device features a maximum on-resistance of 85 Ω at room temperature and extends to 100 Ω across the full industrial temperature range (-40 °C to +85 °C). Switching performance includes a maximum turn-on time of 200 ns and a turn-off time of 150 ns under dual supply conditions. Power consumption is minimal, with supply currents capped at 5 µA. The component utilizes CMOS technology for low leakage and high-speed operation.

Feature Summary

• Normally closed configuration where the switch conducts when the logic input is low
• CMOS fabrication process enabling low power consumption and high speed
• Epitaxial layer construction providing latchup immunity
• True bi-directional signal handling capability

Applications

• Sample-and-hold circuits
• Industrial instrumentation
• Test equipment
• Communications systems

Procurement Notes

Verify the specific suffix 'BDY' confirms the 16-pin Narrow SOIC package and the '-D' designation ensures the -40 °C to +85 °C operating temperature range. Confirm RoHS compliance status if required by procurement specifications, as standard versions may differ from lead-free variants. Ensure the ordering code matches the exact pinout and thermal requirements for the target PCB layout.

Selection Notes

Select this part over the DG308B variant specifically when a normally closed default state is required for the application logic. Verify that the 85 Ω on-resistance meets the signal integrity requirements for the intended voltage levels. Ensure the design accommodates the 16-pin Narrow SOIC footprint and that the ±22 V absolute maximum rating aligns with the system's power supply rails.

Part Context

This component belongs to the DG308B/DG309B series, which are improved iterations of the legacy DG308A and DG309 devices. The B-series offers superior electrical characteristics, including lower on-resistance and reduced charge injection compared to previous generations. The DG309B specifically provides the normally closed functionality distinct from the normally open DG308B within the same family.

Replacement Considerations

DG309BDJ-E3

FAQ

What is the default state of the DG309BDY switches?

The DG309BDY features a normally closed configuration, meaning the switches are ON when the logic input is Low (≤ 3.5 V) and OFF when the logic input is High (≥ 11 V).

What is the maximum analog signal voltage the device can handle?

The device supports an analog signal range from -15 V to +15 V when powered by ±15 V supplies, and it can withstand input signals up to ±22 V.

How does the on-resistance vary with temperature?

The maximum on-resistance is 85 Ω at room temperature and increases to a maximum of 100 Ω across the full operating temperature range of -40 °C to +85 °C.