The ADUM4400ARWZ is a 4-channel digital isolator from Analog Devices' iCoupler family, built on magnetic coupling technology. It delivers 5000 Vrms galvanic isolation across a unidirectional data path — all four channels are inputs on side 1, making it a pure forward-direction isolator for signals like SPI clock, MOSI, and chip-select lines. The 1 Mbps data rate suits moderate-speed control interfaces, sensor readout buses, and general-purpose isolation between logic domains running on 3 V to 5.5 V supplies.
5000 Vrms isolation — where it fits
The 5000 Vrms isolation rating suits safety-critical separation: motor-drive control signals crossing from the DSP to the gate-driver side, or breaking ground loops in industrial sensor networks. The 25 kV/µs minimum common-mode transient immunity means the part holds data integrity across the barrier even when adjacent IGBTs switch at high dV/dt.
Package and temperature grade
Housed in a 16-pin SOIC with 7.50 mm body width — the wide-body SOIC-16 footprint that provides the creepage distance needed to sustain the 5000 Vrms rating. The -40°C to 105°C operating range covers industrial enclosures, outdoor telecom cabinets, and under-hood automotive auxiliary electronics (though this part is not AEC-Q100 listed). Surface-mount assembly; no isolated power on board — the secondary side needs its own supply rail.