What this isolator does on your board
The Texas Instruments ISO7240MDWR is a quad-channel digital isolator using capacitive coupling to pass logic signals across a 2500 Vrms isolation barrier. All four channels are unidirectional and oriented in the same direction (side 1 to side 2), making this part a straight isolation buffer — no reverse channel for bidirectional data.
At 150 Mbps, the ISO7240MDWR can clock a full-duplex SPI bus at 75 MHz or isolate a CAN FD data phase without adding a bit-time penalty. The 2 ns typical rise/fall time and 2 ns max pulse-width distortion keep the signal shape clean enough that you don't need to derate the bus speed for the isolator. Common-mode transient immunity is rated at 25 kV/µs minimum, so it won't glitch on a motor-drive or inverter common-mode step — that's the spec that separates an industrial-grade isolator from a basic coupler.
The 125°C upper limit means it can sit next to a hot power stage or in an engine bay without derating the isolation barrier.
Lifecycle and sourcing posture
If you're dual-sourcing, the ISO7240 family shares the same footprint and pinout across density options — verify the channel count and direction for your specific signal set.