Automotive-grade isolation for harsh environments
The Analog Devices ADUM1402WSRWZ is a 4-channel digital isolator in the iCoupler® family, built with magnetic coupling technology to provide 2500Vrms galvanic isolation between two power domains. The part offers two channels on each side of the isolation barrier (2/2 input configuration), all unidirectional, running at a maximum data rate of 1Mbps. Propagation delay is 100ns max, with pulse-width distortion held to 40ns — tight enough for most SPI and UART isolation applications at this speed grade. Common-mode transient immunity is rated at a minimum 25kV/µs, which keeps the data path clean when switching noise couples across the barrier in a motor-drive or flyback converter environment.
The 2500Vrms isolation voltage is the working spec for basic insulation in 48V to 400V systems — it covers most automotive auxiliary inverters, on-board chargers, and industrial sensor interfaces. If your design requires reinforced insulation or a higher working voltage (e.g., 3750Vrms or 5000Vrms), you would step up to the ADUM1310 or ADUM1411 series siblings. The 1Mbps data rate is a deliberate choice: it is fast enough for isolated SPI at moderate clock rates, UART up to 115200 baud, and general-purpose GPIO isolation, but slower than the 10Mbps and 90Mbps variants in the same package. If your bus needs higher throughput, look at the ADUM1402WCRWZ (the 'C' suffix indicates a higher speed grade) — the pinout and footprint are identical, so a BOM swap is possible without a board respin. Supply voltage spans 3V to 5.5V on both sides, so the part works directly with 3.3V or 5V logic without a separate level shifter. The answer to the common question 'Can ADUM1402WSRWZ work at 5V supply?' is yes — it is rated for the full range, and the 5V rail gives you the best noise margin on the propagation delay spec.
Package and rework considerations
Housed in a 16-SOIC wide-body (0.295-inch, 7.50mm width) package, the ADUM1402WSRWZ is a standard surface-mount part that reworks cleanly with hot air. The wide-body SOIC gives good clearance for under-pin inspection and is less prone to tombstoning than the narrow-body variant. No exposed thermal pad, so the reflow profile is the standard lead-free ramp: prebake at 125°C if the moisture barrier bag has been open past the floor-life window (MSL 3).
Lifecycle and sourcing
For dual-sourcing resilience, the closest functional second-source candidate is the ADUM1310ARWZ (3-channel, same 2500Vrms and 1Mbps), though the channel count differs. If you need a drop-in 4-channel alternate with the same pinout, the ADUM1411ARWZ-RL is a 3/1 input-configuration sibling worth evaluating.