ISO7221BD

Overview

The ISO7221BD is a dual-channel digital isolator from Texas Instruments featuring capacitive coupling technology. It provides bidirectional signal isolation with a maximum data rate of 5 Mbps and an insulation voltage of 2500 Vrms. The device operates within a supply voltage range of 3 V to 5.5 V and supports a wide operating temperature range from -40°C to +125°C. Key electrical parameters include a typical propagation delay of 70 ns, a common-mode transient immunity of 25 kV/µs, and a power consumption of 390 mW. It is housed in an 8-pin SOIC package.

Feature Summary

• Provides robust galvanic isolation between circuits using high-reliability capacitive sensing technology.
• Supports bidirectional data transmission for flexible system integration across isolated boundaries.
• Delivers high common-mode transient immunity to maintain signal integrity in noisy environments.

Applications

• Industrial automation systems requiring reliable communication across isolated zones
• Medical equipment needing safe patient isolation and signal integrity
• Power metering applications involving high-voltage measurement interfaces

Procurement Notes

Verify the specific suffix against official documentation to confirm performance grades and packaging options. Ensure compatibility with required isolation standards such as UL or IEC before procurement. Confirm that the selected variant meets the necessary thermal and electrical specifications for the target application environment.

Selection Notes

Select this component when bidirectional communication is required at speeds up to 5 Mbps. It is suitable for designs needing 2500 Vrms basic isolation in a compact surface-mount package. Consider the 3 V to 5.5 V supply range and -40°C to +125°C operating temperature for industrial or commercial use cases.

Part Context

This part belongs to the ISO722x family of digital isolators, which are designed to replace traditional optocouplers in modern electronic designs. The family offers improved performance in terms of speed, power consumption, and size while maintaining high reliability and safety certifications for various global standards.

Replacement Considerations

ISO7221AD serves as a lower-speed alternative within the same package. ISO7221BDRG4 is a reel-packaged version of the same functional device. Verify pinout and electrical characteristics when substituting with other digital isolator families.