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For a leaded semiconductor, like a diode or a transistor, one of the leads is usually the same piece of metal as the copper pad/heat spreader on the back, which is also shorted to one of the junctions (anode, drain, etc.).

My question is how do the remaining leads interface with the silicon chip inside the package?

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Usually with itty bitty wires that are welded to the chip and the leadframe.

ic leadframe and wires

Image from Wikipedia: Wire Bonding

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