When your circuit requires a diode to act in the reverse-breakdown region use a voltage regulator SZBZX84C18LT1G zener diode from ON Semiconductor. Its test current is 5 mA. Its maximum leakage current is 0.05 μA. Its maximum power dissipation is 300 mW. This component will be shipped in tape and reel packaging for effective mounting and safe delivery. This zener device has a nominal voltage of 18 V and a voltage tolerance of 6%. It is made in a single configuration. This zener diode has a minimum operating temperature of -65 °C and a maximum of 150 °C.