Texas Instruments

ISO7221AD

ISO7221AD Description

The ISO7221AD from Texas Instruments is a dual-channel, unidirectional digital isolator designed for high-speed signal isolation in industrial, automotive, and communication systems. Utilizing capacitive coupling technology, it provides 2500Vrms of galvanic isolation between input and output, ensuring robust protection against high-voltage transients. With a data rate of 1Mbps and low propagation delay (475ns max), it delivers reliable signal integrity for critical applications. The device operates from a 3V to 5.5V supply, making it compatible with a wide range of logic levels. Its 25kV/µs common-mode transient immunity (CMTI) ensures stable performance in noisy environments.

ISO7221AD Features

• High Isolation Voltage: 2500Vrms for enhanced safety in high-voltage systems.
• Fast Switching: Rise/fall times of 1ns and 1Mbps data rate for high-speed applications.
• Robust Noise Immunity: 25kV/µs CMTI minimizes errors in electrically noisy environments.
• Low Power Consumption: Operates from 3V to 5.5V, suitable for power-sensitive designs.
• Compact & Reliable: 8-SOIC package with MSL 1 (Unlimited) moisture sensitivity, ideal for surface-mount applications.
• Unidirectional Channels: Simplified design for signal isolation in one direction.

ISO7221AD Applications

• Industrial Automation: Isolate PLCs, motor drives, and sensors to prevent ground loops.
• Medical Equipment: Ensure patient safety in diagnostic and monitoring devices.
• Automotive Systems: Isolate CAN bus, battery management, and infotainment systems.
• Power Supplies: Provide isolation in switch-mode power supplies (SMPS) and inverters.
• Communication Interfaces: Isolate SPI, I²C, or UART signals in embedded systems.

Conclusion of ISO7221AD

The ISO7221AD is a high-performance digital isolator offering speed, reliability, and robust isolation for demanding applications. Its low propagation delay, high CMTI, and wide supply range make it superior to slower or less immune alternatives. While it is on Last Time Buy status, it remains an excellent choice for designs requiring 2500Vrms isolation with minimal signal distortion. Engineers can leverage its compact form factor and capacitive coupling for noise-resistant, high-speed signal isolation across diverse industries.