This Toshiba Low CR Photorelays is a Solid State Relays (SSR) version and are typically used as signal relay replacements. Photorelays are semiconductor relays made up of an LED optically coupled to a MOSFET. Low capacitance resistance (CR) photorelays are designed to switch high-frequency signals across output terminals. This photorelay comes in a SMT/SMD mounting style. https://elecena.pl/product/16644288/solid-state-relays-pcb-mount-photorelay-s-vsonr4 2020-04-30 https://elecena.pl/product/16644288/solid-state-relays-pcb-mount-photorelay-s-vsonr4 2022-10-05