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?


simulate this circuit – Schematic created using CircuitLab

  • 1
    \$\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

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.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.