Four-channel capacitive isolator for reinforced isolation boundaries
The Analog Devices MAX14935FAWE+ is a 4-channel, unidirectional digital isolator using capacitive coupling to deliver 5000 Vrms of isolation across a 16-SOIC package. Rated for 150 Mbps data rate with 2 ns typical rise/fall times, it handles high-speed SPI, fieldbus, and isolated ADC interfaces without introducing pulse-width distortion beyond 1 ns. The 3/1 channel configuration (three inputs on side 1, one on side 2) suits applications where the majority of signals cross from the controller side to the isolated side, with a single return path.
At 150 Mbps, this isolator keeps up with fast serial links. The 7.5 ns / 7.4 ns max propagation delay (tpLH / tpHL) and 1 ns max pulse-width distortion mean the output pulse width stays within 1 ns of the input — critical for maintaining duty cycle in PWM isolation or encoder feedback paths. Common-mode transient immunity of 25 kV/µs (typical) ensures the data link doesn't glitch when a motor drive or inverter switches at high dv/dt across the isolation barrier. That rating is the one to check when the isolator sits between a 3-phase drive controller and the gate-driver stage.