The SA12CA/B with 19.9V 13.3V 12V DO-15 TVS ROHS is an electronic component manufactured by Yageo for use in various electrical and electronic devices. This component is a transient voltage suppressor diode, commonly known as a TVS diode. It is designed to protect sensitive components such as ICs, transistors, and relays from voltage spikes and other electrical surges. The 19.9V, 13.3V, and 12V ratings signify the maximum voltage spikes that the diode can withstand. It is also RoHS compliant, meaning that it is free of hazardous materials, such as lead and mercury. The DO-15 package allows the diode to be soldered onto printed circuit boards and provide reliable, long-term protection from voltage fluctuations.