ISO7221CD

Overview

The ISO7221CD is a dual-channel digital isolator from Texas Instruments utilizing capacitive coupling technology. It provides bidirectional signal isolation with a data rate of 25 Mbps and an insulation voltage of 2500 Vrms. The device operates within a supply voltage range of 2.8 V to 5.5 V and features a propagation delay of 42 ns. It is housed in an 8-SOIC package and supports an operating temperature range from -40°C to +125°C.

Feature Summary

• Capacitive coupling architecture for high-speed signal transmission
• Dual-channel configuration with unidirectional signal flow
• High common-mode transient immunity capability

Applications

• Industrial process control systems
• Medical equipment signal isolation
• Power metering applications

Procurement Notes

Verify the specific suffix 'CD' indicates tube packaging, as this differs from tape-and-reel variants like 'CDR'. Confirm current availability status, as some sources indicate end-of-life or obsolescence notices for this specific part number. Ensure compliance with RoHS3 standards and check for any recent Product Change Notices affecting manufacturing sites or design specifications before finalizing procurement.

Selection Notes

Select the ISO7221CD when a 25 Mbps data rate is required for isolated communication channels. This component is suitable for designs needing 2500 Vrms basic isolation in an 8-pin SOIC footprint. Consider alternative suffixes if reel packaging is preferred over tubes. Verify that the 2.8 V to 5.5 V supply range aligns with the system's logic levels and power constraints.

Part Context

The ISO7221CD belongs to the ISO722x family of dual-channel digital isolators. This series offers various signaling rate options including 1, 5, and 25 Mbps. The ISO7221 variant specifically targets applications requiring higher speed isolation compared to the 1 Mbps ISO7220. All members share similar pinouts and functional characteristics, differing primarily in data rate and insulation ratings.

Replacement Considerations

Publicly confirmed substitutes include the ISO7221AD and ISO7221ADR. These alternatives offer lower data rates (1 Mbps) but maintain similar packaging and isolation voltages. Verify compatibility regarding propagation delay and supply voltage ranges when substituting.