Taiwan Semi, 18V Zener Diode 2% 200 mW SMT 2-Pin SOD-323F. Diode Configuration: Single. Mounting Type: Surface Mount. Zener Type: General Purpose. Zener Voltage Tolerance: 0.02. Test Current: 5mA. Maximum Zener Impedance: 45Ω. Maximum Reverse Leakage Current: 45nA. Length: 1.8mm. Dimensions: 1.8 x 1.35 x 1mm. Height: 1mm. MPN: BZT52B18S RR, Taiwan Semiconductor