AEC-Q100 qualified digital isolator for automotive signal chains
It provides 5000Vrms galvanic isolation across a 2.25V to 5.5V supply range on both sides, with a data rate of 100Mbps and typical rise/fall times of 1.3ns and 1.4ns.
5000Vrms isolation with 85kV/µs CMTI — what it means for motor-drive and inverter designs
The 5000Vrms isolation voltage meets the reinforced insulation requirements for 600V/800V traction systems, while the common-mode transient immunity of 85kV/µs minimum ensures data integrity during fast-switching events from SiC or GaN power stages. In a motor-drive application, that CMTI headroom keeps the output from toggling on a 10kV/µs bus-voltage transient — a common failure point with lower-rated isolators. Propagation delay is symmetrical at 16ns max for both low-to-high and high-to-low transitions, with pulse-width distortion held to 4.9ns maximum, so timing margins stay predictable across temperature.
2.25V to 5.5V supply — dual-voltage domain bridging without level shifters
The supply range of 2.25V to 5.5V on each side means the ISO7731QDWRQ1 can directly interface a 3.3V microcontroller on side 1 with a 5V peripheral on side 2, or any combination within the range, without external level translation. The channel configuration is 2 inputs on side 1 and 1 input on side 2, which suits isolating two forward signals and one reverse feedback path — for example, two PWM drive signals going into a gate-driver and one fault flag coming back.
No last-time-buy or end-of-life notice has been issued. For production programs already in ramp, this removes the supply-chain risk of an unplanned redesign.