This is for a low power device. The current flow is max 200mA. The control logic is 5V from USB-C so it can provide reasonable currents. The voltage drop across the switch can not be above a few 10’s mV.
Regarding the FSA1156L6X, there is a very high impedance between input and output data ports (on the order of 175MOhms with the stated +/-20nA leakage, if I calculate correctly) when off, but it is not galvanic isolation.
For the TLP3107A, leakage current with maximum voltage differential between input and output (60V) at 25°C is about 15nA. With lower voltage differential, it would be much lower, but the leakage increased exponentially with temperature increase.
Correct, I do not see such a specification either. However, it seems highly likely that the pass element is a MOSFET, though I cannot find a definitive statement of such, and if so, I would expect that the leakage should be the same whether or not the device is off, or on with control input low.
However, it also does not definitively state that one is allowed to apply any voltage to either A or B when the device is unpowered. I suspect it would be fine, but I would not guarantee it.
Hmmm, that’s interesting – 166x the leakage over full temp range when no Vcc. Based on that, there’s a good chance I was wrong about the FSA1156L6X. Another reason to lean toward the SSR solution, albeit a larger and more expensive option.
Yes, it is. When there are no voltages applied to the primary side of the circuit, the switch is an almost a perfect insulator at dc, no leakage. Please check against to your possible timing specification, as this device is “slow” actor…