The ISO7041 device is the option when the SSR circuit needs to be designed for ultra-low power. The ISO7041 is an ultra-low power, multichannel digital isolator that can be used to isolate CMOS or LVCMOS digital I/Os. Each isolation channel has a logic input and output buffer separated by a double capacitive silicon dioxide (SiO₂) insulation barrier. Innovative edge-based architecture combined with an ON-OFF keying modulation scheme allows these isolators to consume very-low power while meeting 3000-V_RMS isolation rating per UL1577. The per channel static current consumption is 3.5 µA at 3.3 V, allowing for use of the ISO7041 in battery-powered thermostats and power-stealing thermostats.

The device can operate as low as 1.71 V, as high as 5.5 V , and is fully functional with different supply voltages on each side of isolation barrier. The four-channel isolator comes in a 16-QSOP package with three forward-direction channels and one reverse-direction channel. The device has default output high and low options. If the input power or signal is lost, default output is high for the ISO7041 device without the suffix F and low for the ISO7041F device with the F suffix.