Digital isolator for the automotive power train
The Texas Instruments ISO7731FQDWQ1 is a three-channel, unidirectional digital isolator built on capacitive coupling technology, rated for 5000 Vrms isolation and a 100 Mbps data rate. It carries AEC-Q100 qualification, making it a fit for automotive battery-management systems, traction inverters, and on-board charger isolation barriers where galvanic separation between the high-voltage domain and the low-voltage control logic is required.
85 kV/µs CMTI — why it matters for motor drives and inverters
Common-mode transient immunity of 85 kV/µs minimum holds output state during fast high-voltage switching edges.
Propagation delay and pulse-width distortion
Maximum propagation delay is 16 ns in both directions, and pulse-width distortion stays under 4.9 ns.
Package and thermal routing
Housed in a 16-pin SOIC wide-body (7.50 mm width), the package provides the creepage distance needed to sustain the 5000 Vrms rating across the barrier. The wide-body footprint is standard for reinforced isolation; the PCB layout should keep a clean slot or gap under the part to maintain the isolation spacing. No exposed thermal pad here — dissipation is modest for a digital isolator at 100 Mbps, but the wide-body still helps with thermal coupling to the board copper.