The MAX14931DASE+ from Maxim Integrated is a 4-channel, unidirectional digital isolator using capacitive coupling to pass signals across a 2750Vrms galvanic isolation barrier. The 3/1 channel split — three inputs on side 1, one on side 2 — suits applications like isolating a three-wire sensor output with a single enable or fault line returning from the controller side.
The common-mode transient immunity of 25kV/µs (typical) gives it headroom in inverter drives where fast-switching IGBTs or SiC MOSFETs generate high dV/dt noise that can corrupt data across the barrier.
Marking and provenance check
Given the active lifecycle and ROHS3 compliance, the laser-etched date-code on the top mark should trace to Maxim's assembly sites. For a buyer sourcing through independent channels, verify that the date-code font, package marking, and tube labeling match Maxim's published marking specifications — inconsistencies in the laser etch or a re-sanded surface are red flags for counterfeit or re-marked stock. The 16-SOIC package is a common target for re-marking due to its wide use; a quick decap and X-ray can confirm the die matches the capacitive-coupling topology expected for this part number.