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Adding Sch Terminal to existing Component

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  • Brad Levy

    There are several ways to handle this, depending on the part and your preferences.

    On some chips the heat sink tab or pad is electrically connected to another pin of the chip (usually, ground).

    On those chips, you can use this technique, as described below in the built-in help:

    Multiple Pin Numbers (Common PCB Pads)

    As well as assigning pins "one to one", it is also possible to assign multiple PCB pins to a single Schematic pin. This allows you to model certain types of component that have 'internal' connections within the component, or those that have multiple pins that need to be assigned to the same net.

    To do this, enter a list of the pcb symbol pins and a corresponding list of pin numbers. Both lists must have the same number of entries. Each list can be separated with commas (to assign all the PCB pins to the same net, with connections in the PCB that need to be routed), or with plus signs (to assign them to the same net, but indicating that the pins are connected internally within the component and do not all need to be routed).

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    The other options are to go to the Schematic Symbols tab in the library manager. Copy the existing schematic symbol for the part to a new name. Select the new symbol (still on the Schematic Symbols tab. Add the heat sink terminal to it using Add Pad or Add SMD Pad, and save the edited symbol. Then open the component in the Components tab of the library manager. Change the schematic symbol to the new one that includes terminal, and update the pin mapping table to map the new terminal of the schematic symbol to the new PCB symbol. Then save the updated component.

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