Exposed solderable heat spreader for flipchip packages
Abstract:
A flipchip may include: a silicon die having a circuit side with solder bumps and a non-circuit side; a leadframe attached to the solder bumps on the circuit side of the silicon die; a heat spreader attached to the non-circuit side of the silicon die; and encapsulation material encapsulating the silicon die, a portion of the leadframe, and all but one exterior surface of the heat spreader. The leadframe may have NiPdAu plating on the portion that is not encapsulated by the encapsulation material and no plating on the portion that is attached to the solder bumps.
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