ADG509FBRN

Analog Switches, Multiplexers, Demultiplexers Overview

The ADG509FBRN is a CMOS analog multiplexer featuring four differential channels within a single 16-lead SOIC_N package. It provides fault protection by withstanding continuous overvoltage inputs from −40 V to +55 V, regardless of power supply status. The device utilizes a series n-channel, p-channel, n-channel MOSFET structure for signal and source protection. Key electrical parameters include a typical on-resistance (RON) of 270 Ω, maximum switching times of 230 ns (Ton) and 130 ns (Toff), and a maximum charge injection of 15 pC. It operates with dual supplies up to ±15 V or a single supply up to 15 V.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Fault protection allowing continuous overvoltage input withstand from -40 V to +55 V
• Break-before-make switching construction to prevent momentary shorting of input signals
• Trench isolation technology eliminates latch-up between p and n-channel MOSFETs
• All switches turn off automatically when power supplies are removed

Analog Switches, Multiplexers, Demultiplexers Applications

• Existing multiplexer applications requiring fault protection
• New designs necessitating robust multiplexer functions in harsh environments
• Data acquisition systems where signal integrity during power loss is critical
• Industrial instrumentation involving high-voltage signal routing

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific package variant, as the ADG509FBRN denotes the narrow-body SOIC option. Confirm RoHS compliance status if required, noting that suffixes like NZ indicate compliance. Ensure the design supports the industrial temperature range of -40°C to +85°C. Cross-reference pin configurations with the official datasheet to match logic control inputs A0, A1, and the Enable pin correctly.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component for applications requiring differential signal switching with inherent overvoltage tolerance. The ADG509F differs from the ADG508F by offering four differential channels instead of eight single-ended channels. Consider the 270 Ω typical on-resistance and 15 pC charge injection limits for precision requirements. The break-before-make feature makes it suitable for multiplexers where signal overlap must be avoided.

Analog Switches, Multiplexers, Demultiplexers Part Context

The ADG509F belongs to the Analog Devices ADG508F/ADG509F family of fault-protected analog multiplexers. This series is designed for industrial and data acquisition environments where standard multiplexers might fail due to voltage transients or power loss events. The F-series variants generally offer improved performance characteristics compared to earlier generations, focusing on reliability and signal integrity under fault conditions.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Publicly confirmed substitutes include other ADI fault-protected multiplexers such as the ADG508F for single-channel applications. Verify pin compatibility and channel configuration (differential vs. single-ended) before substitution. Ensure the replacement part meets the same overvoltage withstand specifications (-40 V to +55 V) and operating temperature ranges.

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the ADG509F protect against overvoltage when power is off?

When power supplies are off, the device's internal MOSFET structure ensures that inputs remain open-circuited with only nanoamperes of leakage current flowing, protecting both the multiplexer and the connected signal sources from damage.

What is the significance of the break-before-make switching feature?

This feature guarantees that the previous channel disconnects before the new channel connects, preventing momentary short circuits between different input signals during switching transitions.

Can the ADG509F handle analog signals outside its power supply rails?

Yes, the device can withstand continuous overvoltage inputs ranging from -40 V to +55 V, even if the power supplies are not present or are within the standard operational range.