PTVS Series 400 W 9.2 V Uni-Directional Surface Mount TVS Diode - SOD-123W, What is TVS diode, Uni Directional TVS diode, silicon voltage suppressor, Transient Voltage Suppressor Diode, Uni-Directional Zener TVS Diode https://www.futureelectronics.com/p/electromechanical--circuit-protection--tvs-diodes/ptvs5v0s1ur-115-nexperia-8850067