Hello. Welcome to Futurlec. The electronic components Superstore. To find the component your looking for, either search by Part Number or visit the relative department. Need Help. ZENER DIODES 400mW Series High performance Zener Diodes with sharp kneepoint, low noise and low dynamic impedance. Ideal for use as voltage clamps, voltage stabilisers and also voltage references. 1W Series Higher power dissipation Zener Diodes with kneepoint voltages from 3.3V to 33V. Good heat dissipation and reliable performance. 5W Series Heavy Duty Zener Diodes with Vz up to 150V, sharp kneepoint voltages and excellent heat dissipation.