1) it is importat to use satasheets whe desiging pads and footprints because while designing pads and footprints, we need data regarding how many lags are there in the component, how much distance is between legs, how long legs will be, how much diameter the components cover,etc. which will be available in the datasheet of that perticular component.
2)We need two pads to design through hole capacitor because capacitor has two lags which we have to connect.
3)Pad2Pad can be used to design thru-hole pads.
4)Thru-Discrete can be used to design thru-hole footprint.
SMD discrete is used for surface mounted component's pad design.
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