This is a transient voltage suppressor (TVS) diode, manufactured by Panjit and certified for RoHS compliance. It has a SMA (DO-214AC) package, and it is designed to protect against voltage surges of up to 4SMAJ85A_R1_00001 with 137V 94.4V 85V. It is rated for a peak reverse voltage of 137V and a 94.4V vent clamp voltage, with a maximum operating voltage of 85V.