The ADUM7643CRQZ is a six-channel, unidirectional digital isolator from the Analog Devices iCoupler family. It uses magnetic coupling to pass digital signals across a 1000 Vrms isolation barrier at up to 25 Mbps. Packaged in a 20-lead QSOP (the supplier device package is 20-QSOP), it's a surface-mount part. No isolated power is generated on-chip — you supply Vdd on both sides separately.
The 25 Mbps data rate and 50 ns max propagation delay (tpLH / tpHL) put this part in the mid-speed isolator tier. The 15 kV/µs common-mode transient immunity (CMTI) is the standout spec for noisy environments. In a motor-drive or inverter application, fast switching of IGBTs or SiC MOSFETs can inject large dV/dt common-mode spikes across the isolation barrier. A CMTI of 15 kV/µs means the part will not latch up or corrupt data under those transients — a key reliability factor for industrial drives and solar inverters.
Unidirectional channels — watch the direction mapping
Because the channels are unidirectional, the PCB layout must respect the fixed direction: three inputs on side 1, three on side 2. Reversing a channel on the board will not work — you need the ADUM7642 or ADUM7641 variants if your signal count or direction split is different. For bidirectional signals like I²C SDA, you would need two channels or an external direction-control circuit.
Lifecycle and supply position
It is ROHS3 compliant. For production runs, the active status means no forced redesign on the horizon.