Semiconductor device
AssigneeRenesas Electronics Corporation
InventorKoichi Kanemoto
Life of this patent
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Abstract
In a QFP with a chip-stacked structure in which a lower surface of a die pad is exposed from a lower surface of a sealing member, a semiconductor chip having a BCB film, which is made of a polymeric material containing at least benzocyclobutene in its backbone as an organic monomer and formed on its surface, is mounted at a position (second stage) that is away from the die pad. As a result, even when moisture invades through the interface between the die pad and the sealing member, it is possible to prolong the time required for the moisture to reach the semiconductor chip, and subsequently to make moisture absorption defect less likely to occur.
Claims12
A semiconductor device comprising:
- a die pad having an upper surface and a lower surface opposite to the upper surface;
- a plurality of leads arranged around the die pad;
- a first semiconductor chip having a first main surface, a plurality of first electrode pads formed on the first main surface, a first protective film formed over the first main surface such that the first electrode pads are exposed from the first protective film, and a first rear surface opposite to the first main surface, the first semiconductor chip being mounted on the die pad such that the first rear surface faces the upper surface of the die pad;
- a second semiconductor chip having a second main surface, a plurality of second electrode pads formed on the second main surface, a second protective film formed over the second main surface such that the second electrode pads are exposed from the second protective film, and a second rear surface opposite to the second main surface, the second semiconductor chip being mounted on the first semiconductor chip such that the second rear surface faces the first main surface of the first semiconductor chip;
- a plurality of first wires electrically connected with the first electrode pads, respectively;
- a plurality of second wires electrically connected with the second electrode pads, respectively;
- and
- a sealing member sealing the die pad, the first semiconductor chip, the second semiconductor chip, the first wires and the second wires such that the lower surface of the die pad is exposed from the sealing member,
- wherein the second protective film is made of a polymeric material containing benzocyclobutene in a backbone thereof;
- and
- wherein the first protective film is made of a material different from the polymeric material.
Dependencies are inferred from the claim text.