What the ADUM1246ARSZ does on the board
The ADUM1246ARSZ is a two-channel digital isolator from Analog Devices' iCoupler family, built around magnetic coupling technology. It provides 3750Vrms isolation between two unidirectional channels — one input on side 1, one output on side 2, and a second channel in the same orientation — making it a straightforward fit for isolating a single bidirectional signal pair or two independent unidirectional signals. The 2Mbps data rate suits control and status signals, sensor interfaces, and isolated SPI or UART links where throughput stays under that ceiling. Supply range of 2.25V to 3.6V on both sides allows direct connection to 2.5V or 3.3V logic rails without a separate level translator. The 20-SSOP package (5.30mm body width) keeps the board footprint compact; the surface-mount package is standard for automated assembly. Common-mode transient immunity of 25kV/µs minimum ensures the barrier holds during fast voltage swings on motor-drive or inverter nodes.
Isolation barrier and timing — what the ratings mean
The 3750Vrms isolation rating is the peak repetitive voltage the barrier withstands for 60 seconds per UL 1577. That is a basic isolation level, suitable for reinforced applications if the system working voltage stays within the derated limits — check your end-equipment safety standard. Propagation delay is 180ns max in either direction, and pulse-width distortion is held to 8ns max, so the isolator does not skew the signal edges significantly. Rise and fall times of 2ns typical keep the output edges clean without excessive ringing when driving a short trace. The 2.25V to 3.6V supply range on each side means the same part works across 2.5V and 3.3V domains. If one side runs at 2.5V and the other at 3.3V, the unidirectional channels handle the level shift internally — no external translation needed.
Lifecycle and sourcing posture
The part is ROHS3 compliant.