Automotive-grade galvanic isolation for noisy environments
This part carries AEC-Q100 qualification, making it suited for automotive power train, battery management, and motor drive subsystems where galvanic isolation must hold up under high common-mode transients — the 25kV/µs minimum CMTI rating directly addresses that.
Two channels, one direction each — routing signal and control across the isolation barrier
The ISO7221CQDRQ1 provides two unidirectional channels with one input on side 1 and one input on side 2, which covers the common case of a single data line plus a single control or status line crossing the barrier. Propagation delay is 42ns max in both directions with a 2ns pulse-width distortion ceiling, tight enough for SPI-like clock rates up to 12 MHz or PWM duty-cycle accuracy in a motor controller's gate-drive interface. The 1ns typical rise/fall times mean the signal integrity at the receiver end is clean, but the edge rate is fast enough that layout matters — keep the trace from the isolator output to the downstream load under a few inches unless you add series termination.
Supply range and power-up sequencing
The device runs from 3V to 5.5V on each side independently, so a 3.3V MCU domain can talk to a 5V sensor or actuator side without a level shifter. No internal isolated DC-DC converter is on board — you supply power to both sides separately. The wide supply tolerance also means this part can ride through cold-crank conditions on the 5V rail without dropping out of regulation on the isolator core.
Housed in a standard 8-SOIC package with a 3.90mm body width, the ISO7221CQDRQ1 is a drop-in replacement for many SOIC-8 digital isolators. The supply decoupling on each side should use a 0.1µF ceramic placed within 2mm of the respective VDD pin to keep the internal oscillator clean and maintain the 25kV/µs transient immunity.