The best way to operate a diode in the reverse-breakdown region in your circuit is by using a voltage regulator MMBZ5256BLT1G zener diode from ON Semiconductor. Its maximum power dissipation is 300 mW. Its maximum leakage current is 0.1 μA. Its test current is 4.2 mA. Tape and reel packaging will encase this product during shipment, in order to ensure safe delivery and enable quick mounting of components. This zener diode has an operating temperature range of -65 °C to 150 °C. It is made in a single configuration. This zener device has a nominal voltage of 30 V and a voltage tolerance of 5%.