ISO7721D

Overview

The ISO7721D is a general-purpose digital isolator from Texas Instruments featuring capacitive coupling technology. It provides two independent channels with a 3000Vrms isolation rating per UL 1577. The device supports data rates up to 100Mbps and offers a common-mode transient immunity of 85kV/µs. It operates on a single supply voltage ranging from 2.25V to 5.5V. The component is housed in an 8-SOIC package with a width of 3.90mm. Propagation delays are typically 16ns, with rise and fall times around 1.8ns and 1.9ns respectively. It functions within a temperature range of -55°C to 125°C.

Feature Summary

• Provides robust galvanic isolation between independent systems using capacitive coupling technology.
• Features high common-mode transient immunity to protect against noise and voltage spikes.
• Supports bidirectional signal transmission with low propagation delay for high-speed data integrity.

Applications

• Industrial automation systems requiring isolated communication interfaces
• Medical equipment needing reinforced isolation for patient safety
• Power electronics monitoring circuits

Procurement Notes

Verify the specific package variant, as the ISO7721D designation may refer to different pin counts depending on the source context. Confirm current availability status as this part number is listed as obsolete by major distributors. Ensure that any substitute components meet the required isolation voltage and data rate specifications for your application design.

Selection Notes

Select this component when a dual-channel isolator with moderate speed requirements is needed. Consider the 8-pin SOIC package for space-constrained designs. Evaluate the 3000Vrms isolation rating against system safety standards. Check if the 100Mbps data rate suffices for the intended communication protocol before finalizing the selection.

Part Context

The ISO7721D belongs to the ISO772x family of high-speed, robust EMC reinforced dual-channel digital isolators. This series utilizes Texas Instruments' capacitive isolation technology to provide reliable signal transmission across isolation barriers. The family includes variants with different channel counts and package options to suit various industrial and commercial applications.

Replacement Considerations

The ISO7721DR is listed as a recommended manufacturer substitute. Verify compatibility regarding package dimensions and electrical characteristics before replacement.