ISO7220AD

Overview

The ISO7220AD is a dual-channel digital isolator from Texas Instruments utilizing capacitive coupling technology. It provides bidirectional signal isolation with a maximum data rate of 1 Mbps and a common-mode transient immunity of 25 kV/µs. The device operates on a single supply voltage ranging from 3 V to 5.5 V, drawing a nominal supply current of 17 mA. It features a propagation delay of 475 ns and low pulse-width distortion. Packaged in an 8-pin SOIC format, it supports an operating temperature range from -40°C to +125°C and offers 2500 Vrms isolation voltage for robust noise immunity.

Feature Summary

• Capacitive coupling architecture ensures high reliability and long-term stability without optical degradation.
• Integrated logic functionality simplifies system design by eliminating the need for external components.
• High common-mode transient immunity protects against fast-switching noise in industrial environments.

Applications

• Industrial automation control systems
• Medical equipment signal isolation
• Power metering and energy management

Procurement Notes

Verify the specific suffix (AD) confirms the tape-and-reel packaging variant when ordering. Confirm the 8-SOIC package dimensions match the PCB footprint requirements. Ensure the 3V to 5.5V supply range aligns with the target system voltage. Check for RoHS compliance status if required by regional regulations. Validate the 2500 Vrms isolation rating against safety standards applicable to the end application.

Selection Notes

Select this component for applications requiring cost-effective isolation with moderate data rates up to 1 Mbps. It is suitable where space constraints favor the compact 8-SOIC package over larger alternatives. Consider the 17 mA supply current for power budget calculations in battery-operated devices. Choose this part when high common-mode transient immunity is critical for signal integrity in noisy environments.

Part Context

The ISO7220AD belongs to the ISO722x family of dual-channel digital isolators. This series offers various signaling rate options including 1, 5, 25, and 150 Mbps. The family shares similar pinouts and functional characteristics, allowing for scalable design upgrades. The AD suffix typically denotes specific packaging or testing configurations within the broader ISO7220 product line.

Replacement Considerations

Direct substitutes include the ISO7220ADR and ISO7220ADRG4 variants which share identical electrical specifications. Cross-vendor replacements such as SI8420AB-C-ISR are available but require verification of pin compatibility and isolation ratings.