Digital isolator for high-speed signal isolation
The Analog Devices ADUM142E1BRWZ is a 4-channel digital isolator from the iCoupler® family, built around magnetic coupling technology. It delivers 3750Vrms galvanic isolation across a 16-SOIC wide-body package, with a data rate of 150Mbps and propagation delays of 13ns max per channel. The supply range spans 1.7V to 5.5V, letting it bridge 1.8V, 2.5V, 3.3V, and 5V logic domains without an external level translator.
The 3750Vrms isolation rating is the reinforced-safety figure for a 16-SOIC wide-body package, adequate for basic insulation in 300V working-voltage systems and for functional isolation in higher-voltage industrial equipment. The 75kV/µs common-mode transient immunity (CMTI) is the spec that matters in noisy environments: in a motor-drive or inverter stage, fast voltage slewing across the isolation barrier can couple errors into the data path. A CMTI of 75kV/µs keeps the output state valid through those transients, avoiding spurious bit flips on the SPI or UART bus.
150Mbps data rate — SPI isolation without margin trouble
At 150Mbps, this isolator handles 50 MHz SPI clocks cleanly, with 2.5ns typical rise/fall times and 3ns max pulse-width distortion. That timing budget leaves headroom for the propagation delay (13ns max) and still meets setup/hold at the slave side. For I2C isolation, note the unidirectional channel type — each channel drives one direction only, so a bidirectional I2C bus requires two channels per signal line or an external direction-control scheme. The 2/2 input/output split (two channels forward, two reverse) maps naturally to a 4-wire SPI bus (SCLK, MOSI, MISO, SS) with one spare channel for a reset or fault signal.
The iCoupler series has a broad second-source ecosystem within Analog Devices' own portfolio — the ADUM142E0BRZ offers the same channel count and data rate at 3000Vrms isolation in a similar 16-SOIC footprint, which can serve as a drop-in for lower-isolation requirements or as a dual-sourcing option when supply flexibility matters.