25 Mbps, 3000 Vrms — the iCoupler that bridges fast industrial signals
The ADUM1285BRZ is a 2-channel, unidirectional digital isolator from ADI's iCoupler series, built on magnetic coupling technology. It delivers 25 Mbps data rate with 3000 Vrms isolation in a compact 8-SOIC package. Typical applications include industrial fieldbus isolation, motor-drive interface, and isolated SPI or UART links where the signal direction is fixed (2/0 input-side/output-side channels).
Propagation delay and pulse-width distortion — timing budget for the bus
Maximum propagation delay is 35 ns in both directions, with pulse-width distortion held to 3 ns max. That keeps the timing budget tight enough for 25 Mbps NRZ signalling without needing to deskew the channel. Rise and fall times are symmetrical at 2.5 ns typical, which helps maintain signal integrity across the isolation barrier. For designs that already run a 10 Mbps isolator like the ADUM1200BRZ, the 35 ns delay is a meaningful improvement over the 50 ns of that part — the ADUM1285BRZ buys you 15 ns of margin per edge.
25 kV/µs CMTI — keeps the data clean through fast switching edges
Common-mode transient immunity is rated at 25 kV/µs minimum. That is the spec that matters when the isolator sits between a noisy power stage and a controller — motor-drive IGBT switching, inverter commutation, or a flyback converter's primary-side FET. If the CMTI is too low, the output glitches on a fast common-mode step. At 25 kV/µs the ADUM1285BRZ handles the edge rates found in most industrial drives without extra filtering.
ADI lists the ADUM1285BRZ as Active. ROHS3 compliant. For dual-sourcing resilience, the closest functional peer is the ADUM1200BRZ — same 2/0 channel configuration and unidirectional type, but its data rate is 10 Mbps and isolation is 2500 Vrms. That is a genuine alternative only if your system can tolerate the lower speed and isolation level.
Package and storage — 8-SOIC, tube, MSL considerations
The ADUM1285BRZ ships in Tube, not tape-and-reel. The 8-SOIC body is 3.90 mm wide, a standard footprint that routes easily on two-layer boards. No exposed thermal pad — the 8-SOIC dissipates through the leads and copper plane. Store the tubes in a dry cabinet if the ambient humidity is above 60% RH.