The Texas Instruments ISO7240ADW is a 4-channel, unidirectional digital isolator using capacitive coupling, rated for 4000Vpk isolation. It's the part you reach for when you need to pass four digital signals across a safety barrier — think isolated SPI, UART, or general-purpose GPIO on a motor-drive control board or a PLC I/O module. The 1Mbps data rate covers most fieldbus and sensor interfaces without breaking a sweat, and the 2ns typical rise/fall time keeps signal integrity clean on a 16-SOIC layout.
The supply range spans 3.15V to 5.5V on both sides, so it can bridge a 3.3V MCU domain to a 5V peripheral without a level shifter. Common-mode transient immunity of 25kV/µs (minimum) means it won't glitch when a motor drive or inverter switches — a real concern in noisy industrial environments.