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Add D2PAK diodes with NC pin 1

evanshultz requested to merge github/fork/evanshultz/d2pak-nc-pin1 into master

The existing D2PAK diode symbol we have in this lib has pin 1 connected to the cathode. Some diodes in this package have pin 1 set as NC, and in this case connecting them to the anode is usually beneficial for layout since the copper can pour all across both leadformed pins.

So I created silicon and Schottky symbol to support this pinout. Pin 1 is floating above the symbol so it's easily connectable to the anode net. If you have other suggestions please share.

https://www.onsemi.com/pub/Collateral/ISL9R1560S3S-D.PDF image

https://www.vishay.com/docs/89060/v20150sg.pdf image

For convenience, here is the footprint: image

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