Dual-sided substrate integrated circuit package including a leadframe having leads with increased thickness

Abstract

An integrated circuit package includes a first non-conductive substrate having a first inner surface and a second non-conductive substrate having a second inner surface. A die having a first thickness is disposed between the first and second inner surfaces. A leadframe includes a member having a proximal end and a distal end. The proximal end has a second thickness less than the first thickness. The distal end is disposed between the first and second inner surfaces. The distal end is undulated such that the distal end has an effective thickness greater than the second thickness.

Description

TECHNICAL BACKGROUND [0001] This invention relates generally to a dual-sided substrate integrated circuit package, and, more particularly, to a leadframe included in a dual-sided substrate integrated circuit package. BACKGROUND OF THE INVENTION [0002] Miniaturized electronic components, such as chip transistors, processors, etc., must often be assembled in conjunction with circuits, assemblies or components of comparatively larger dimensions. This can create design and manufacturing challenges when it becomes necessary to place such miniature components in communication with these larger circuits, assemblies or components. [0003] One solution to such manufacturing problems has been through the use of leadframes. A leadframe is a thin layer of metal that connects the wiring from tiny electrical terminals on the semiconductor surface to the large-scale circuitry on electrical devices and circuit boards. Leadframes provide an electrical conduit from the multiple small terminals commonl...

AI Technical Summary

Benefits of technology

This approach reduces the risk of defects, lowers manufacturing costs, and allows for easier production with less stress on materials, enabling the use of narrower and less expensive copper stock, and simplifies the progressive die design, reducing operational expenses and the need for custom thickness leadframes.

Problems solved by technology

This can create design and manufacturing challenges when it becomes necessary to place such miniature components in communication with these larger circuits, assemblies or components.

Since the thickness of the die is generally greater than that of the leadframe, the leadframe may not be able to bridge the gap between contacts on the circuit boards without some modification to the leadframe.

The leadframe can be provided with a laminate structure to increase its thickness, but a laminate structure requires costly, complex, and time consuming manufacturing processes.

In addition, a laminate structure can negatively impact the flexibility of the leadframe and therefore may not be suitable for some assemblies.

A problem with the technique of doubling over the leadframe member tip is that it requires either a large progressive die with multiple stages to flatten the leadframe member tip, or an additional secondary die or bending fixture.

This tight form on the leads work hardens the base copper and plating material, and can create stress cracks across the hem where the leadframe member tip is doubled over.

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