Over years of continuous operation, the light output of the IR LED decreases. It is standard practice to assume a 20% to 50% reduction in CTR over the system's operational lifespan.
Route input LED traces parallel and close together to minimize loop areas, reducing susceptibility to electromagnetic interference (EMI). 1458 optocoupler datasheet
20% to 100% (depending on the specific binning of the 1458 component, measured at Saturation Voltage ( VCE,satcap V sub cap C cap E comma s a t end-sub ): Maximum 0.4 V ( Over years of continuous operation, the light output
: Optimized for high-speed and low-voltage operations. Voltage Supply ( VCCcap V sub cap C cap C end-sub Over years of continuous operation