What this isolator does on the board
It passes a single digital signal across a 2500Vrms isolation barrier at data rates up to 25Mbps, making it the part you reach for when a SPI chip-select, a PWM gate-drive signal, or a fault flag needs to cross a ground potential difference without level translation or optocoupler ageing drift.
25 Mbps and the timing budget
At 25Mbps the part handles most industrial serial interfaces — SPI clocks up to 12.5 MHz, UART at any common baud rate, and isolated gate-drive pulse trains. The 18ns max propagation delay (tpLH/tpHL) and 3ns typical rise/fall times mean you budget roughly 36 ns round-trip for a feedback loop; the 2ns max pulse-width distortion keeps duty-cycle errors under half a percent at 10 MHz, which matters for PWM duty-cycle accuracy in motor drives.
Common-mode transient immunity — the motor-drive spec
Rated at 25kV/µs minimum CMTI, this isolator holds its output state through the fast voltage swings on a 600V or 1200V inverter phase node. If you are isolating a gate-driver or current-sense signal on a variable-frequency drive, that 25kV/µs figure is the one that keeps the output from glitching when the IGBT switches.
Supply-voltage range and level shifting
With a supply range of 3V to 5.5V on both sides (single supply, same Vdd for input and output), the ADUM3100ARZ-RL7 can act as a 5V-to-3.3V or 3.3V-to-5V level shifter as long as both sides share the same supply rail. For true dual-supply level translation where input and output run at different voltages, you would need a part like the ADuM120x with separate Vdd pins. The 1/0 input-to-output channel count means signal flows in one direction only — this is a one-way isolator, not a bidirectional buffer.
Package and footprint reality
Housed in the standard 8-SOIC narrow-body (3.90mm width), the ADUM3100ARZ-RL7 shares the same land pattern as countless other SOIC-8 isolators and op-amps. Surface-mount only — no through-hole option. The 8-SOIC package has no exposed pad, so all thermal dissipation goes through the leads; at 25Mbps continuous the die stays cool, but if you are running near the full data rate at 105°C ambient, keep the airflow moving.
Lifecycle and supply posture
If you are filling a BOM line today, this part is in the active channel with no last-time-buy clock running.