Four-channel isolation in a 20-SSOP
The Analog Devices ADUM3472ARSZ-RL7 is a four-channel digital isolator from the iCoupler family, built on magnetic coupling technology. It provides 2500Vrms isolation across a unidirectional 2/2 input-to-output split — two channels running each direction — at a data rate of 1Mbps. The 20-SSOP package (5.30mm body width) is a surface-mount footprint that reworks cleanly with hot air; the 0.209-inch body gives enough pin pitch for manual inspection.
The 2500Vrms isolation rating covers basic functional isolation for industrial control, motor drives, and power-supply feedback paths — enough for the secondary side of a 24V or 48V bus, but not reinforced isolation for mains-connected gear. The 1Mbps data rate handles SPI, UART, and GPIO-level signalling cleanly; the 100ns propagation delay (max) and 40ns pulse-width distortion keep timing margins tight for synchronous interfaces. Common-mode transient immunity of 25kV/µs is the spec that matters in inverter and motor-drive environments: it prevents data corruption when the ground plane jumps under switching transients. The supply range accepts 3V to 3.6V on one side and 4.5V to 5.5V on the other, so it bridges a 3.3V MCU domain to a 5V peripheral rail without a level shifter.
Rework bench notes
The 20-SSOP package is a rework-friendly part: the 5.30mm body width and 0.65mm pin pitch are visible under a stereo microscope, and the gull-wing leads are forgiving of minor pad misalignment. Standard hot-air profile at 260°C peak (10 seconds above 250°C) lifts the part cleanly. No exposed pad underneath, so no thermal-via staking needed. The -RL7 reel suffix means the parts come in tape form; if you are hand-placing a few units, cut-tape or tube variants of the same die are available.