Use a voltage regulator SZMMSZ3V3T1G zener diode from ON Semiconductor that will work for backward currents. Its maximum power dissipation is 500 mW. Its test current is 5 mA. Its maximum leakage current is 5 μA. This product will be shipped in tape and reel packaging so that components can be mounted effectively. It is made in a single configuration. This zener diode has an operating temperature range of -55 °C to 150 °C. This zener device has a nominal voltage of 3.3 V and a voltage tolerance of 5%.