MOSFET With Zener Diode Protection The layer of silicon dioxide between the gate and the channel is very thin and is subject to puncture by static electricity. When working with MOSFETs, special handling precautions should be taken as follows: 1. MOS devices should have their leads shorted together for shipment and storage. Conductive foam is often used for this purpose. 2. Avoid unnecessary handling, and pick up the device by the device by the case, not the leads. 3. All test equipment and tools should be connected to the earth's ground. 4. Workers handling MOSFET devices should have grounding straps attached to their wrists. 5. Never remove or insert MOSFET devices with the power on. Many MOSFET devices are now available with built-in more Zener diode protection. Zener diodes are placed between the gate and the channel, as shown in Fig. The voltage rating of the more Zener diode is below the voltage that would cause punctures to the silicon dioxide insulator. If the