Vishay General Semiconductor, Inc.

Huiying Ding

Heinrich Karrer

Junfeng Liu

Longnan Jin

Thomas Schmidt

Techniques and devices are disclosed for forming wettable flanks on no-leads semiconductor packages. A lead frame assembly may include a plurality of leads, each lead including a die surface and a plating surface, and an integrated circuit die arranged on the die surface. The plating surface for each of the leads may be plated with an electrical plating. A connecting film may be applied and lead frame assembly may be singulated into individual semiconductor packages by a series of cuts through each of the plurality of leads and the electrical plating of each of the plurality of leads to a depth up to or through a portion of the connecting film to create a channel exposing lead sidewalls of each of the plurality of leads. The lead sidewalls of each of the plurality of leads may be plated with a second electrical plating and the connecting film may be removed.

Semiconductor package and packaging process for side-wall plating with a conductive film

Techniques and devices are disclosed for forming wettable flanks on no-leads semiconductor packages. A lead frame may include a plurality of lead sets, each lead set including leads having a die surface and a plating surface, vias between adjacent lead sets in a first direction, and an integrated circuit die arranged on the die surface of each die lead. A mold chase may be applied to the plating surfaces, the mold chase including mold chase extensions extending into the vias between each adjacent lead set in the first direction, each mold chase extension having a peak surface. The lead frame assembly may be partially embedded in a mold encapsulation such that portions of the mold encapsulation contact the peak surfaces. The mold chase may be removed to expose the vias containing sidewalls and the plating surfaces and the sidewalls may be plated with an electrical plating.

Package assembly for plating with selective molding

Packaging process for side-wall plating with a conductive film

Packaging process for plating with selective molding

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Tianjin, China

Huiying Ding