25kV/µs CMTI — why it matters for motor drives and inverters
The ADUM3210ARZ: Common-mode transient immunity is rated at 25kV/µs minimum. In a motor-drive or inverter environment, the switching node can slam the isolation barrier with several kilovolts per microsecond. If the isolator's CMTI is too low, data gets corrupted or the output latches to the wrong state. 25kV/µs is a solid industrial-grade number — enough for most VFD and servo-drive applications without needing a reinforced-isolation part. The 50ns propagation delay (max) and 5ns pulse-width distortion keep the timing budget tight enough for PWM signal isolation up to a few hundred kHz.
Supply range and channel direction — design-in checklist
Supply voltage covers 3V to 5.5V on both sides, so you can run the primary at 3.3V and the secondary at 5V (or vice versa) without a separate level shifter. The channel configuration is 2 inputs on Side 1, 0 inputs on Side 2 — meaning both channels drive from the same side. If you need a bidirectional pair or a 1/1 split, the ADUM1281ARZ (3000Vrms, 1/1) is the closer match. The 8-SOIC footprint is standard; no exposed pad, so thermal dissipation is through the leads only — keep ambient under 105°C.
Lifecycle and compliance — no LTB surprises
The iCoupler series is active per the product status.