In summary, SIDACtor devices are crowbar devices that, once triggered, essentially short out the protected line, redirecting the excess energy away from the protected circuit. Once the overvoltage event has stopped, these devices will “delatch” and allow the circuit to resume normal operation. There are several key parameters to consider when choosing a SIDACtor device which include the V-I curve, VDRM, VBO, VS, IH, surge current withstand, and power cross events. Additionally, SIDACtor devices have a few circuit protection interaction characteristics that should be kept in mind in the design process including let through voltage, turn-on time, and capacitance. Littelfuse has a wide selection of SIDACtor devices which are designed to accommodate many circuit protection requirements.