AEC-Q100 digital isolator for safety-rated automotive signal chains
It provides 3000Vrms galvanic isolation between two supply domains while passing data at up to 50Mbps with 2.6ns typical rise/fall times and 18ns max propagation delay.
3000Vrms isolation with 100kV/µs CMTI — what it means for motor-drive and inverter designs
The 3000Vrms isolation voltage is the reinforced rating for basic isolation in 400V-class automotive traction inverters and DC-DC converters. The common-mode transient immunity of 100kV/µs minimum is the spec that matters in a motor-drive environment: fast-switching SiC or IGBT stages produce dV/dt edges that can couple across a capacitive isolation barrier and corrupt the logic state. At 100kV/µs this isolator holds its output state through those transients without bit errors — the same reason you see this part in gate-driver feedback paths and resolver-to-digital interfaces where the controller side must stay clean.
Dual-supply architecture and unidirectional channels
The ISO6721FBQDRQ1 has two unidirectional channels with one input on side 1 and one on side 2, giving one forward and one reverse path in a single package — enough for a full-duplex SPI or UART isolation link. The supply range is split: 1.71V to 1.89V on one side and 2.25V to 5.5V on the other, allowing direct interface to a 1.8V MCU domain on the low-voltage side while the isolated side runs at 3.3V or 5V for a sensor or actuator bus. No isolated DC-DC converter is integrated, so a separate isolated power supply is needed for the secondary side — typical in designs where the isolation transformer for the bias rail is already present.
Functional Safety (FuSa) series and AEC-Q100 qualification
Listed as part of the Functional Safety (FuSa) series, this isolator is intended for use in safety-related automotive systems developed to ISO 26262. The AEC-Q100 qualification confirms the part has passed the automotive-grade reliability stress tests — extended temperature cycling, high-temperature operating life, and moisture sensitivity — that are mandatory for production vehicle programs. The lifecycle status is Active, meaning TI continues to manufacture and support the part for new designs.
Package and footprint: 8-SOIC
Supplied in an 8-SOIC package with a 3.90mm body width and surface-mount footprint. Standard SOIC-8 land pattern applies; no exposed thermal pad to route.
Sourcing reality for this automotive isolator
The ISO6721FBQDRQ1 is an active, current-production automotive-grade isolator from TI.