The SA28A electronic part is a three-voltage TVS (Transient Voltage Suppresor) diode made by Yageo. It features 45.4V, 31.1V, and 28V breakdown voltages and is encased in a DO-15 package, which is RoHS compliant. It is used for protecting electronic equipment from voltage transients, and it can be used in applications such as automotive electronics, appliance, consumer electronics, LED displays, computer, and telecom.