Introduction
Optocouplers provide both galvanic signal isolation and output level shifting in a single package but are notorious for their long propagation times, poor common-mode transient immunity (CMTI), and performance degradation with temperature and device age. Modern isolation devices fabricated in CMOS process technology offer higher performance and reliability with none of the downside issues of optocouplers. The Silicon Labs Si87xx family of digital isolators can directly replace optocouplers while providing substantial gains in performance and reliability.