ISO7221ADG4

Overview

The ISO7221ADG4 is a dual-channel digital isolator from Texas Instruments, utilizing capacitive coupling technology for signal transmission. It features a unidirectional channel configuration with one forward and one reverse path. The device operates within a supply voltage range of 3 V to 5 V and supports data rates up to 1 Mbps. Key electrical parameters include an insulation voltage of 2500 Vrms, a propagation delay of 405 ns, and a typical rise time of 2 ns. It functions across an extended temperature range of -40°C to +125°C and is housed in an SOIC-8 surface-mount package.

Feature Summary

• Capacitive coupling isolation architecture provides high common-mode transient immunity
• Dual-channel design with independent unidirectional signal paths
• Extended industrial operating temperature range for harsh environments

Applications

• Industrial process control systems requiring galvanic isolation
• Measurement and sensing equipment interfaces
• General-purpose digital communication isolation

Procurement Notes

Verify component status carefully as the ISO7221ADG4 is listed as obsolete and scheduled for discontinuation by Texas Instruments. Confirm availability through authorized distributors or identify suitable replacement parts before finalizing procurement plans to ensure supply chain continuity.

Selection Notes

Select this component for applications requiring dual-channel isolation with moderate data speeds. Ensure the system voltage aligns with the 3 V to 5 V operational range. Consider the SOIC-8 package dimensions for PCB layout compatibility and verify thermal requirements against the specified operating temperature limits.

Part Context

This part belongs to the ISO7221A series of digital isolators. It shares functional similarities with other members like the ISO7221ADR but differs in packaging format. The series is designed for general-purpose isolation tasks, offering a balance between performance and power consumption for interface applications.

Replacement Considerations

Texas Instruments recommends the ISO7221ADR as a substitute. Verify pinout and parameter compatibility before integration.