The Texas Instruments ISO7241CDWG4 is a quad-channel, unidirectional digital isolator using capacitive coupling. It delivers 25 Mbps per channel — fast enough for Profibus, DeviceNet, and SPI-level isolation without the cost of a 150 Mbps part. The 2500 Vrms isolation rating is basic isolation, suited for non-mains applications or designs where the system already provides reinforced isolation elsewhere. Common-mode transient immunity (CMTI) is rated at 25 kV/µs minimum, which handles the fast switching edges in motor drives, inverters, and industrial power supplies without data corruption.
Channel configuration and supply flexibility
Three channels run from Side 1 to Side 2, one channel runs the opposite direction — a 3/1 split that matches many half-duplex bus interfaces or mixed-direction sensor links. No integrated DC-DC converter means you need an isolated power supply on the secondary side if the load requires it.
Timing and signal integrity
Propagation delay is 42 ns max in both directions, with pulse-width distortion held to 2.5 ns max. Rise and fall times are 2 ns typical — fast edges that keep the signal clean but also mean the PCB layout should treat the output traces as controlled-impedance lines if the trace length exceeds a few inches.
The 125°C upper limit covers the hot spots near power stages and enclosures that see direct sun.