Electronic assemblies without solder and methods for their manufacture
The present invention provides an electronic assembly 400 and a method for its manufacture 800, 900, 1000 1200, 1400, 1500, 1600, 1700 . The assembly 400 uses no solder. Components 406 , or component packages 402, 802, 804, 806 with I/O leads 412 are placed 800 onto a planar substrate 808 . The assembly is encapsulated 900 with electrically insulating material 908 with vias 420, 1002 formed or drilled 1000 through the substrate 808 to the components' leads 412 . Then the assembly is plated 1200 and the encapsulation and drilling process 1500 repeated to build up desired layers 422, 1502, 1702 . Assemblies may be mated 1800 . Within the mated assemblies, items may be inserted including pins 2202 a , 2202 b , and 2202 c , mezzanine interconnection devices 2204 , heat spreaders 2402 , and combination heat spreaders and heat sinks 2602 . Edge card connectors 2802 may be attached to the mated assemblies.
1. A circuit assembly comprising: a first RIP subassembly and a second RIP subassembly, each having a contact surface, wherein the contact surface of the first RIP subassembly is attached to the contact surface of the second RIP subassembly with a connective; wherein an RIP subassembly comprise:
a substrate having an electrically conductive via;
a circuit formed on one side of the substrate; the circuit connected to the via;
a component, having a lead, attached to the other side of the substrate the lead connected to the via; and
a encapsulent covering the component and attaching it to the other side of the substrate, the encapsulent havinq no vias communicating with said lead, the encapsulent comprising a contact surface.
2. The circuit assembly of claim 1 wherein the connective is an adhesive.
3. The circuit assembly of claim 1 wherein the connective is fused encapsulent.
4. The circuit assembly of claim 1 , wherein one or more pins connect the first RIP subassembly with the second subassembly.
5. The circuit assembly of claim 4 , wherein one or more pins physically connect subassembly with subassembly.
6. The circuit assembly of claim 1 , wherein one or more mezzanine interconnection devices electrically connect the first RIP subassembly with the second subassembly.
7. The circuit assembly of claim 6 wherein at least one of the one or more mezzanine interconnection devices comprises angled pins.
8. The circuit assembly of claim 7 wherein at least one of the one or more mezzanine interconnection devices comprises angled pins and one or more stepped edges.
9. The circuit assembly of claim 1 , wherein the connective comprises a heat spreader.
10. The circuit assembly of claim 1 , wherein the connective comprises a combination heat sink.
11. The circuit assembly of claim 1 , wherein the connective comprises a heat sink and an edge connector is attached to the heat sink.
12. The circuit assembly of claim 1 , wherein the connective comprises heat sink and an edge connector is attached to the circuit of each RIP assembly.