ISO721DG4

Overview

The ISO721DG4 is a single-channel digital isolator from Texas Instruments, manufactured in the SOIC-8 package. It utilizes capacitive coupling technology to provide electrical isolation with a rated insulation voltage of 2500 Vrms. The device supports data rates up to 150 Mbps and operates within a supply voltage range of 3 V to 5.5 V. Key performance metrics include a typical propagation delay of 16 ns, a common-mode transient immunity (CMTI) of 25 kV/µs, and an operating temperature range from -40°C to +125°C.

Feature Summary

• Provides robust high-voltage digital isolation for reliable data exchange between isolated circuits
• Utilizes capacitive coupling technology to ensure signal integrity across the isolation barrier
• Features high common-mode transient immunity to maintain performance in noisy environments

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing safe patient isolation
• Power electronics control interfaces

Procurement Notes

Verify component status as the ISO721DG4 is listed as obsolete and no longer manufactured by Texas Instruments. Confirm availability of recommended manufacturer substitutes such as the ISO721D before procurement. Ensure that any replacement components meet the original design specifications for isolation voltage, data rate, and package dimensions to maintain system compatibility.

Selection Notes

Select this component for applications requiring single-channel isolation with high-speed data transmission capabilities. Consider the SOIC-8 package constraints and the 3 V to 5.5 V supply voltage requirements during circuit design. Evaluate the need for 2500 Vrms isolation strength and 150 Mbps data throughput against alternative devices if long-term supply stability is a primary concern due to the obsolete status.

Part Context

The ISO721DG4 belongs to the ISO721 family of high-speed digital isolators from Texas Instruments. These devices are designed to replace traditional optocouplers, offering superior performance in terms of speed, power consumption, and size. The DG4 suffix indicates a specific tape-and-reel or tube packaging variant within the broader product line, tailored for surface-mount assembly processes.

Replacement Considerations

Texas Instruments recommends the ISO721D as a direct substitute for the obsolete ISO721DG4. Verify pinout compatibility and electrical parameter equivalence when transitioning to the replacement part.