Abstract:
A dual solder layer for fluidic self assembly, an electrical component substrate, and method employing same is described. The dual solder layer comprises a layer of a self-assembly solder (12) disposed on a layer of a base solder (14) which is disposed on the solder pad (16) of an electrical component substrate(18). The self-assembly solder (12) has a liquidus temperature less than a first temperature and the base solder (14) has a solidus temperature greater than the first temperature. The self-assembly solder (12) liquefies at the first temperature during a fluidic self assembly method to cause electrical components (10) to adhere to the substrate (18). After attachment, the substrate(18) is removed from the bath (20) and heated so that the base solder (14) and self-assembly solder (12) combine to form a composite alloy (22) which forms the final electrical solder connection between the component (10) and the solder pad (16) on the substrate (18).
Abstract:
Described herein are electronic assemblies including a subassembly film and methods for making the same. In some embodiments, a first subassembly is formed by placing an electronic die at a die placement location on a subassembly film. A second subassembly may be formed by placing the first subassembly at a subassembly placement position on a base layer, such that electrical contacts/traces on the first film overlap with electrical contacts/traces at a subassembly connection point on the base layer. Placement of the die on the subassembly film may be performed with automatic placement machinery that has a placement accuracy that is greater than that required to place the first subassembly on the base layer. As a result, the costly and time consuming manual inspection of die placement may be avoided.
Abstract:
A dual solder layer for fluidic self assembly, an electrical component substrate, and method employing same is described. The dual solder layer comprises a layer of a self-assembly solder disposed on a layer of a base solder which is disposed on the solder pad of an electrical component substrate. The self-assembly solder has a liquidus temperature less than a first temperature and the base solder has a solidus temperature greater than the first temperature. The self-assembly solder liquefies at the first temperature during a fluidic self assembly method to cause electrical components to adhere to the substrate. After attachment, the substrate is removed from the bath and heated so that the base solder and self-assembly solder combine to form a composite alloy which forms the final electrical solder connection between the component and the solder pad on the substrate.