Four-channel capacitive isolator for mixed-voltage domains
The MAX14931FASE+ from Maxim Integrated is a 4-channel digital isolator using capacitive coupling to provide 2750 Vrms of galvanic isolation across a 16-SOIC package. It is a General Purpose device — no integrated DC-DC converter — so you supply the isolated-side power separately. The part is unidirectional: three channels run from Side 1 to Side 2, one channel runs the opposite direction, which covers the typical SPI or UART isolation pattern without wasting a channel. Data rate is 150 Mbps, propagation delay 7.5 ns max (tpLH) and 7.4 ns max (tpHL), pulse-width distortion 1 ns max. Common-mode transient immunity is 25 kV/µs minimum — that is the number that matters when the isolator sits next to a half-bridge switching at tens of kHz: it keeps the output from glitching on a fast-rising ground bounce.
Active, current production — no LTB risk
Mounting and footprint
Surface-mount package is 16-SOIC with a 3.90 mm body width (0.154"). The narrow SOIC footprint matches many existing isolation footprints; verify the pin 1 orientation against your layout. Supplied in Tube (standard for sample and low-volume builds); reel options may be available through alternate ordering codes.