Isolation barrier and signal integrity for harsh environments
The Texas Instruments ISO7820FDW is a two-channel, unidirectional digital isolator built with capacitive coupling technology, rated for 5700Vrms isolation across the barrier. It supports a 100Mbps data rate with 16ns max propagation delay and 2.4ns typical rise/fall times, making it suitable for isolating SPI, UART, or general-purpose digital signals in systems where galvanic isolation is required for safety or noise immunity.
100kV/µs CMTI — what it buys you in motor drives and inverters
Common-mode transient immunity is rated at a minimum of 100kV/µs. In practice, that means the isolator will not glitch or lose data when a fast voltage transient (like a 600V IGBT switching edge) slams the ground reference on one side of the barrier. For motor-drive, solar-inverter, or industrial-PLC designs where the isolated side sees high dv/dt, this CMTI rating is the spec that keeps the data path clean without external filtering.
Two forward-only channels — plan your signal direction
The channel configuration is 2 inputs on side 1, 0 inputs on side 2 — both channels carry data from side 1 to side 2 only. There is no reverse-direction channel. If your application requires bidirectional communication (e.g., a half-duplex RS-485 bus with direction control), you will need a second isolator or a part with at least one reverse channel. For purely forward paths like isolated sensor readout or SPI clock-and-data, this fixed direction is exactly what you want.
Active lifecycle — no near-term LTB risk
There is no announced last-time-buy or end-of-life notice. It is also ROHS3 compliant, so no conflict with current environmental directives.