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I have a fast recovery diode, part number D30FD60K, I would like to know how I have to connect it. The diode will be used as the return path in parallel with a fuse. Like shown in the diagram.

Pin 3 will go to the switch, but I don't know how to connect 1 and 2. And why is a NC on pin 1? Is that normally closed, how does it open?

schematic

simulate this circuit – Schematic created using CircuitLab

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    \$\begingroup\$ NC means Not Connected. \$\endgroup\$
    – Long Pham
    Apr 22 '19 at 12:52
  • \$\begingroup\$ In a typical D252 package either pins 1 and 3 are connected, or there is another diode going in opposite direction. In both cases I would recommend to connect 1 and 3 in the layout. \$\endgroup\$ Apr 22 '19 at 15:27
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That diode has four pins.

You connect it as shown in the diagram in the datasheet:

enter image description here

Pin 1 is not connected (NC) electrically. Place a pad to mount it. It is only there for mechanical purposes.

Pin 2 is a stub. You cannot place a pad for it. It is electrically connected to pin 4 (the large tab on the back of the part.)

Pin 3 is the anode. It goes to the switch in your circuit.

Pin 4 is the tab on the back. It is the cathode. You connect it to the power supply in your circuit.

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