Six-channel unidirectional isolator for industrial buses
The Texas Instruments ISO6763DWR is a six-channel, unidirectional digital isolator from the ISO676x family using capacitive coupling technology. It supports multiple serial protocols including CAN, RS232, RS485, and SPI, making it a versatile isolation solution for industrial communication interfaces. Key characteristics include a 50 Mbps data rate, 5000 Vrms isolation voltage, and 50 kV/µs common-mode transient immunity.
The 50 Mbps data rate, combined with a maximum propagation delay of 18 ns (tpLH / tpHL) and pulse-width distortion of 7 ns, gives enough timing margin for most SPI, CAN, and RS-485 links up to 50 Mbps. The 4.5 ns typical rise/fall time keeps signal integrity clean on the 16-SOIC footprint. For a 50 Mbps SPI clock, the 18 ns delay adds about one clock period of latency — budget that in your read-back timing if you are polling status registers across the barrier.
5000 Vrms reinforced isolation and 50 kV/µs CMTI — survives motor-drive transients
The 5000 Vrms isolation rating provides reinforced isolation for industrial equipment requiring safety isolation per IEC 60747-5-5. The 50 kV/µs common-mode transient immunity means this isolator will not glitch when a motor drive or inverter switches 600 V in a few nanoseconds — a common failure point for optocouplers and older capacitive isolators. The capacitive coupling technology inherently handles these fast edges better than opto-based solutions.
Channel configuration: 3 inputs on side 1, 3 inputs on side 2
The six channels are split 3/3 — three inputs on side 1 and three inputs on side 2 — all unidirectional. This means three channels run from the primary-side supply to the secondary, and three run the opposite direction. That matches the signal flow of a typical SPI isolator (SCLK, MOSI, CS from master to slave; MISO from slave to master) plus one extra channel each way for a reset or enable signal.
The ISO6763QDWRQ1 automotive-grade variant (AEC-Q100 qualified, 100 kV/µs CMTI) is a separate order code for designs requiring automotive qualification.