Taiwan Semi, 18V Zener Diode 5% 500 mW SMT 2-Pin MiniMELF. Diode Configuration: Single. Mounting Type: Surface Mount. Zener Type: Voltage Regulator. Zener Voltage Tolerance: 0.05. Test Current: 5mA. Maximum Zener Impedance: 50Ω. Maximum Reverse Leakage Current: 100nA. Length: 3.7mm. Diameter: 1.6mm. Dimensions: 1.6 (Dia.) x 3.7mm. MPN: BZV55C18 L1, Taiwan Semiconductor