Abstract:
The principles described herein relate to methods for soldering electrode terminals, pins or lead-frames of commercial electric components for high temperature reliability. In one embodiment, prior to soldering the electric components, a pre-plated solder layer is removed from the lead frame or pins, and nickel and/or gold films are formed with electroless plating. The removal of the pre-plated solder layer avoids excess pre-plated Sn with high-Pb solder that lowers the melting point to between 180°C and 220°C and weakens solder joints. The nickel layer formed with an electroless plating acts as a barrier to the interdiffusion of tin from solder with copper of the lead frame material, which may otherwise occur at high temperatures. Interdiffusion forms an intermetallic compound layer of copper and tin and degrades solder joint strength. The novel soldering processes improve high temperature reliability of solder joints and extend electronics life-time.
Abstract:
A microelectronic assembly, a surface mount component and method of providing the surface mount component. The assembly comprises: a substrate having bonding pads disposed on a mounting surface thereof, the bonding pads including a ferromagnetic material therein; solidified solder disposed on the bonding pads; and a surface mount component bonded to the substrate by way of the solidified solder and including a magnetic layer disposed on a substrate side thereof, the magnetic layer being adapted to cooperate wit the ferromagnetic material in the bonding pads to establish a magnetic force of a sufficient magnitude to hold the surface mount component on the substrate before and during soldering.
Abstract:
A composite heat sink device (1) includes a heat sink body (2, 3) formed of aluminum, the body (2, 3) having a pair of coplanar surfaces (4), and a thermally conductive solderable element (5), for example of copper, mechanically fixed to each of the coplanar surfaces (4). Each of the solderable elements has a first surface which is contiguous with one of the coplanar surfaces, and a second surface which is soldered to a printed circuit board.
Abstract:
An interconnection contact structure assembly including an electronic component (102) having a surface and a conductive contact terminal (103) carried by the electronic component (102) and accessible at the surface. The contact structure (101) includes an internal flexible elongate member (106) having first (107) and second ends (108) and with the first end (107) forming a first intimate bond to the surface of the conductive contact terminal (103) without the use of a separate bonding material. An electrically conductive shell (116) is provided and is formed of at least one layer of a conductive material enveloping the elongate member (106) and forming a second intimate bond with at least a portion of the conductive contact terminal immediately adjacent the first intimate bond.
Abstract:
A method and apparatus for interconnecting electronic circuit boards (212, 214, 219, 221) through the use of twisted wire jumpers (231) which are formed from multifilament wire and which have enlarged bird cages (300) formed along the jumpers. The jumpers are drawn through a stack of circuit boards to position the cages in contact with plated interconnection apertures (303) located in the printed circuit boards. The frictional engagement of the cages (300) in the apertures (303) provides both electrical interconnection of, and mechanical coupling between the printed circuit boards (212, 214, 219, 221).
Abstract:
Es wird ein elektrischer Anschlusskontakt (5) für ein keramisches Bauelement (2) angegeben. Der Anschlusskontakt (5) weist ein erstes Material (M1) und ein darauf angeordnetes zweites Material (M2) auf, wobei das erste Material (M1) eine große elektrische Leitfähigkeit und das zweite Material (M2) einen kleinen thermischen Ausdehnungskoeffizienten aufweist.
Abstract:
A capacitor with first plates and second plates. A dielectric is between the first plates and the second plates. A first external termination is in electrical contact with the first plates and a second external termination is in electrical contact with the second plates. A first lead terminal is in electrical contact with the first external termination and the first lead terminal has a first foot below the first external termination and a first solder stop coated on the first foot between the first foot and the first external termination. A second lead terminal is in electrical contact with the second external termination wherein the second lead terminal comprises a second foot below the second external termination and a second solder stop is coated on the second foot between the second foot and the second external termination.
Abstract:
A microelectronic device package (100) that includes a microelectronic device (106) encapsulated within a packaging material (102). The microelectronic device package also includes a lead (104) attached to a portion of the microelectronic device extending through the packaging material. The lead has a break portion and a non-break portion on a tip of the lead.