ISO7731DBQ

Overview

The ISO7731DBQ is a high-speed, robust-EMC reinforced triple-channel digital isolator manufactured by Texas Instruments. It features three forward channels and one reverse channel within an SSOP-16 package. The device supports data rates up to 100 Mb/s with a typical propagation delay of 11 ns. It operates on a supply voltage range of 2.25 V to 5.5 V and provides an insulation voltage of 2500 Vrms using capacitive coupling technology. Key electrical specifications include a maximum rise/fall time of 3.9 ns, a pulse width distortion of 0.6 ns, and a power dissipation of 150 mW. The component functions within a temperature range of -55°C to +125°C.

Feature Summary

• Provides reinforced isolation for high-speed signal transmission across three forward and one reverse channel.
• Utilizes capacitive coupling technology to ensure robust electromagnetic compatibility performance.
• Operates reliably across an extended industrial temperature range without requiring shutdown functionality.

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reinforced safety barriers
• Power electronics control circuits

Procurement Notes

Verify the specific suffix (DBQ vs DBQR) to confirm packaging type, as the DBQ variant typically indicates tube packaging while DBQR indicates reel or cut tape. Confirm RoHS compliance status through official manufacturer documentation before integration. Ensure design-in compatibility with the SSOP-16 footprint and verify that the 2500 Vrms insulation rating meets the specific safety requirements of the target application environment.

Selection Notes

Select this component when reinforced isolation and high EMC immunity are required for triple-channel applications. Compare against the ISO7730 series if bidirectional communication is needed, as the ISO7731 is unidirectional. Consider the ISO7131 series for lower power consumption needs, noting its reduced data rate. Ensure the 100 Mb/s speed and 11 ns delay align with system timing constraints.

Part Context

This part belongs to the ISO773x family of digital isolators from Texas Instruments. It is distinct from the ISO7741 which offers four channels. The ISO7731DBQ is specifically designed for applications demanding high reliability and noise immunity. It serves as a critical interface component in systems where signal integrity must be maintained across isolated boundaries.

Replacement Considerations

The ISO7731DBQR is a pin-compatible alternative differing primarily in packaging format. Verify if the ISO7730DBQ is suitable if bidirectional channels are required instead of unidirectional ones. Check for obsolescence notices as some variants may be scheduled for discontinuation.

FAQ

Is the ISO7731DBQ bidirectional?

No, the ISO7731DBQ is unidirectional, featuring three forward channels and one reverse channel.

What is the maximum data rate supported by this isolator?

The device supports a maximum data rate of 100 Mb/s.