What the 5000Vrms rating buys you on the barrier
The ADUM2401BRWZ-RL is a 4-channel, unidirectional digital isolator from Analog Devices' iCoupler series, built around magnetic coupling technology. Its headline rating is 5000Vrms isolation — that's reinforced-grade insulation for a 16-SOIC wide-body package, enough to meet the safety spacing requirements in industrial motor drives, grid-tied power converters, and medical patient-contact equipment where a barrier failure means a shock hazard or a fried controller board. The three forward channels and one reverse channel let you isolate a SPI bus (SCLK, MOSI, CS) plus a status-feedback line in a single package.
10 Mbps and 25 kV/µs CMTI — the real-world margins
At 10 Mbps the part covers isolated UART, SPI, and general-purpose digital signalling without the cost premium of 100 Mbps+ isolators. The 50 ns max propagation delay (tpLH / tpHL) and 3 ns pulse-width distortion mean you can run a 1 MHz SPI bus with enough timing margin for most MCU peripherals. The 25 kV/µs minimum common-mode transient immunity is the spec that matters when the isolator sits on a switching node — a motor-drive inverter leg or a flyback primary-secondary boundary — where fast voltage slewing would otherwise couple through parasitic capacitance and corrupt the data stream. Rise and fall times are 2.5 ns typical, so the edges are clean enough for most digital inputs without extra Schmitt-trigger buffering.
The supply range spans 2.7V to 5.5V on each side independently, so you can run the primary at 3.3V and the secondary at 5V without a level-shifter — common in mixed-voltage systems where a 3.3V MCU talks to a 5V sensor or gate-drive. The wide-body SOIC-16 package (7.50 mm width) provides the creepage distance needed to sustain the 5000Vrms rating across the barrier.
Sourcing this part for your BOM line
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