Use a voltage regulator SZMMSZ5240BT1G zener diode from ON Semiconductor that will work for backward currents. Its maximum leakage current is 3 μA. Its maximum power dissipation is 500 mW. Its test current is 20 mA. Tape and reel packaging will encase this product during shipment, in order to ensure safe delivery and enable quick mounting of components. It is made in a single configuration. This zener diode has a minimum operating temperature of -55 °C and a maximum of 150 °C. This zener device has a nominal voltage of 10 V and a voltage tolerance of 5%.