The SMF48A is an unidirectional surface mount TVS (Transient Voltage Suppressor) diode packaged in an SOD-123FL form factor, manufactured by the company JSMSEMI. It is RoHS (Restriction of Hazardous Substances) compliant, and its maximum ratings include a maximum of 2.6A forward current, 77.4V peak forward blocking voltage, 53.3V reverse voltage, 48V working voltage, and 58.9V breakdown voltage. The diode has a low leakage current of 1uA. This component is intended for use in protecting sensitive electronic equipment against voltage surges caused by lightning, electrical faults, or other transient occurrences.