What the 1 Mbps data rate means for your I2C bus
The ADUM1251ARZ is an I²C digital isolator from Analog Devices' iCoupler series, using magnetic coupling to provide galvanic isolation for a two-wire I2C bus. It supports data rates up to 1 Mbps, which covers standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode-plus (up to 1 MHz) I2C buses without any throughput bottleneck. The part has two channels: one bidirectional for the SDA line and one unidirectional for the SCL line, with the channel count configured as 2/1 (Side 1/Side 2). This architecture is purpose-built for isolated I2C communication where the bus must cross a safety isolation barrier.
Isolation and transient immunity for noisy environments
Rated for 2500 Vrms isolation, this part provides basic or reinforced isolation in industrial motor drives, medical equipment, and power-supply control loops where the I2C bus must bridge a high-voltage boundary. The minimum common-mode transient immunity of 25 kV/µs means the isolator rejects fast voltage spikes that couple across the barrier — a spec that matters in inverter-fed motor drives or switch-mode power supplies where switching edges can exceed several kV/µs. If your system sees those transients, this part holds the bus data intact.
The part is surface-mount in an 8-SOIC package (3.90 mm width), a common footprint that keeps PCB layout straightforward.