ISO7220ADG4

Overview

The ISO7220ADG4 is a dual-channel digital isolator from Texas Instruments utilizing capacitive coupling technology. It provides electrical isolation with a rated insulation voltage of 2500 Vrms and supports data rates up to 1 Mbps. The device operates within a supply voltage range of 3 V to 5 V, drawing a typical quiescent current of 10 mA per channel. It features unidirectional signal transmission with one forward and zero reverse channels. Key timing specifications include a maximum propagation delay of 405 ns and a typical rise/fall time of 2 ns. The component is housed in an SOIC-8 package and is designed for operation across an extended temperature range of -40°C to +125°C.

Feature Summary

• Dual-channel capacitive coupling architecture for robust signal isolation
• High common-mode transient immunity capability
• Wide operating supply voltage range supporting standard logic levels
• Extended industrial temperature rating for harsh environments

Applications

• Industrial process control systems requiring galvanic isolation
• Medical equipment signal interfaces
• Power metering and energy monitoring circuits
• Inverter and motor drive gate driver isolation

Procurement Notes

Verify the specific suffix 'DG4' to confirm the tube packaging format, as the 'RG4' variant indicates reel packaging. Confirm lifecycle status, as this part may be obsolete or recommended for new designs depending on the current date. Ensure compatibility with existing PCB footprints for the SOIC-8 package. Check for RoHS compliance documentation if required by your manufacturing standards. Validate that the 3V to 5V supply range matches your system power rails.

Selection Notes

Select this component when bidirectional isolation is not required, as it offers only unidirectional channels. Compare against the ISO7221A series if bidirectional communication is needed. Consider the ISO7220ADR variant if tape-and-reel packaging is preferred for automated assembly. Evaluate the higher insulation voltage options like the ISO7240A if system requirements exceed 2500 Vrms. Assess power consumption needs, as this device draws approximately 10 mA per channel.

Part Context

The ISO7220ADG4 belongs to the ISO7220A family of dual digital isolators. It serves as a legacy alternative to newer generations such as the ISO7220D or ISO7220E, which offer improved performance metrics. The 'G4' suffix denotes lead-free and RoHS-compliant construction. This part is functionally similar to the ISO7220ADR but differs in packaging type, being supplied in tubes rather than reels.

Replacement Considerations

Texas Instruments recommends the ISO7220ADR as a direct substitute. Verify pinout compatibility before replacement. Other manufacturers may offer equivalent parts, but functional equivalence must be confirmed against datasheet parameters.