Two-channel capacitive isolator for 1 Mbps industrial links
The ISO7221AD: One channel runs from side 1 to side 2, the other from side 2 to side 1, giving you bidirectional isolation in a single 8-SOIC package.
The 14 ns maximum pulse-width distortion keeps the mark-space ratio tight enough for UART-based protocols like RS-485 at 115.2 kbaud. Rise and fall times are typically 1 ns, which keeps edge-rate-induced common-mode coupling low in noisy environments.
25 kV/µs CMTI — the real noise-rejection spec
Capacitive coupling inherently offers better CMTI than optocouplers at this data rate, and the ISO7221AD delivers that advantage without needing an isolated secondary supply — the Isolated Power flag is No.
There is no official successor because none is needed. An equivalent with a different speed grade would be a pin-compatible drop-in, but verify the propagation delay against your timing budget.