5 Isolation

Isolators have logic input and output buffers separated by a silicon-dioxide (SiO2) isolation barrier, providing high voltage isolation. These devices block high voltages, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry. TI’s ISO7420 and ISO7140 series with 4-kV isolation and ISO7520 and ISO7641 series with 6-kV isolation specs are used in this application report.