Chip lead frames
First Claim
Patent Images
1. A device comprising:
- a lead frame having conductive leads and an insulative composition interposed between the leads;
a die having a lower die surface that overlies a first region of the lead frame, is connected by contacts to the lead frame, and is spaced by a gap from the first region; and
a polymer composition that forms a continuous network that forms a layer that extends at least above the lower die surface and covers regions of the lead frame surface that are outside the first region and are not occupied by any component.
1 Assignment
0 Petitions
Accused Products
Abstract
Chip lead frames are made by disposing a die having terminals on a substrate surface to form a cavity between the die and the substrate and contacts between the terminals and the substrate. A compound is applied to the surface such that the compound enters that cavity and forms a layer on the upper substrate surface. The layer can impart sufficient rigidity to the assembly that the substrate can be etched to produce a lead frame. Also disclosed are devices that include a die, a lead frame, and a continuous network that can form a layer on the lead frame and fill the cavity between the die and the lead frame.
40 Citations
30 Claims
-
1. A device comprising:
-
a lead frame having conductive leads and an insulative composition interposed between the leads;
a die having a lower die surface that overlies a first region of the lead frame, is connected by contacts to the lead frame, and is spaced by a gap from the first region; and
a polymer composition that forms a continuous network that forms a layer that extends at least above the lower die surface and covers regions of the lead frame surface that are outside the first region and are not occupied by any component. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A device comprising:
-
a conductive substrate;
a die having a lower die surface that opposes a first region of the substrate, is connected by contacts to the substrate, and is spaced by a gap from the first region; and
a polymer composition that forms a network on a region of the substrate that extends at least above the lower die surface, the layer imparting sufficient rigidity to the device to maintain integrity of the contacts during etching of the substrate in the absence of a supporting frame. - View Dependent Claims (7, 8, 9)
-
-
10. A device comprising:
-
a lead frame;
a die having a lower die surface that overlies, is connected by contacts to, and is spaced by a gap from a first region of the lead frame;
a peripheral component also connected to the lead frame at a location other than in the first region; and
a polymer composition that extends in a direction normal to the lead frame at least above the lower die surface and extends along a surface of the lead frame from the die to the peripheral component. - View Dependent Claims (11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30)
-
-
13. A method comprising:
-
a) forming a gap between a die and a substrate to which the die is connected;
b) causing a compound to enter the gap and to form a layer on an upper surface of the substrate; and
c) setting the compound to generate a continuous, rigid network that extends within the gap and forms a layer surrounding the die perimeter.
-
-
23. A method comprising:
-
a) disposing a die having terminals on an upper substrate surface of a conductive substrate such that a cavity is formed between the die and the substrate and contacts are formed between the terminals and the conductive substrate; and
b) etching the conductive substrate to generate conductive leads.
-
Specification