Thin package system with external terminals
A thin package system with external terminals and a leadframe is provided. An external bond finger defining template is provided and used to form external bond fingers on the leadframe. A die is provided and attached to the leadframe. At least portions of the die and the external bond fingers are encapsulated, and the leadframe is removed.
1. A method of manufacturing a thin package system with external terminals, comprising:
providing a leadframe;
providing an external bond finger defining template;
forming external bond fingers having a rectangular cross-section in the template on the leadframe;
forming land pad terminals, having a substantially rectangular cross-section on the leadframe, by four layer plating;
providing a die;
attaching the die to the land pad terminals above the leadframe;
encapsulating at least portions of the die and the external bond fingers; and
removing the leadframe.
2. The method as claimed in claim 1 wherein the leadframe is a copper alloy leadframe.
3. The method as claimed in claim 1 wherein:
providing an external bond finger defining template further comprises providing a template that also defines a ground plane; and
using the template to form external bond fingers further comprises forming a ground plane on the leadframe.
4. The method as claimed in claim 1 wherein:
providing an external bond finger defining template further comprises providing a template that also defines land pad terminals; and
attaching the die to the leadframe further comprises connecting the die electrically to the land pad terminals.
5. The method as claimed in claim 1 wherein using the template to form external bond fingers further comprises plating a multi-layer plating having a first layer of about 0.003 μm gold, a second layer of about 0.1 μm palladium, a third layer of about 5.0 μm nickel, and a fourth layer of about 0.5 μm palladium.
6. A method of manufacturing a thin package system with external terminals, comprising:
providing a leadframe;
forming a resist on the leadframe, the resist having openings therethrough;
plating external bond fingers having a rectangular cross-section on the leadframe in the openings through the resist;
removing the resist;
forming land pad terminals, having a substantially rectangular cross-section on the leadframe, by four layer plating;
providing a die having terminal pads;
attaching the die to the land pad terminals above the leadframe with an adhesive;
wire bonding the die to the external bond fingers with gold stud bumps connecting leadframe wires to the terminal pads on the die and gold stud bumps connecting the leadframe wires to the external bond fingers;
encapsulating at least portions of the die and the external bond fingers; and
dissolving and removing the leadframe.
7. The method as claimed in claim 6 wherein the leadframe is a copper alloy leadframe.
8. The method as claimed in claim 6 wherein:
forming the resist further comprises forming the resist with a ground plane opening therein; and
plating the external bond fingers further comprises forming a ground plane in the ground plane opening in the resist.
9. The method as claimed in claim 6 wherein:
forming the resist further comprises forming the resist with land pad terminal openings therein;
forming the land pad terminals further comprises forming land pad terminals in the land pad terminal openings in the resist; and
attaching the die to the leadframe further comprises connecting the die electrically to the land pad terminals.
10. The method as claimed in claim 6 wherein plating the external bond fingers onto the leadframe further comprises plating a multi-layer plating having a first layer of about 0.003 μm gold, a second layer of about 0.1 μm palladium, a third layer of about 5.0 μm nickel, and a fourth layer of about 0.5 μm palladium.