Abstract:
An ignition trace pattern (10) on a printed circuit board (19) for conveying an initiating electrical current to a reactive multilayer foil preform (14) in a bonding region. The ignition trace (10) includes an ignition pad (11) disposed on the printed circuit board (19) adjacent to, but electrically isolated from, a bond pad (12) in the bonding region on the printed circuit board (19), a remote pad (13) disposed outside the bonding region on the printed circuit board (19) to which an electrode (16) may be electrically connected for delivering an initiating electrical current, and a trace (18) connecting the remote pad (13) and the ignition pad (11). The trace (18) is configured to conduct an initiating electrical current from the remote pad (13) to the ignition pad (11) and into any adjacent reactive multilayer foil performs (14) in electrical contact with the ignition pad (11) in the bonding region.
Abstract:
A method for bonding an LED assembly (71) or other electronic package (31) to a substrate PCB containing a heat-sink (52), which utilizes layers of reactive multilayer foil (51) disposed between contacts (32, 34) of the electronic package 31 and the associated contact pads (55) on the supporting substrate PCB. By initiating an exothermic reaction in the reactive multilayer foil (51), together with an application of pressure, sufficient heat is generated between the contacts (32, 34) and the associated contact pads (55) to melt adjacent bonding material (54) to obtain good electrically and thermally conductive bonds between the contacts 32, 34 and contact pads (55) without thermally damaging the electronic package (31), heat-sensitive components (35) associated with the electronic package (31), or other the supporting substrate PCB.
Abstract:
A method for bonding an LED assembly (71) or other electronic package (31) to a substrate PCB containing a heat-sink (52), which utilizes layers of reactive multilayer foil (51) disposed between contacts (32, 34) of the electronic package 31 and the associated contact pads (55) on the supporting substrate PCB. By initiating an exothermic reaction in the reactive multilayer foil (51), together with an application of pressure, sufficient heat is generated between the contacts (32, 34) and the associated contact pads (55) to melt adjacent bonding material (54) to obtain good electrically and thermally conductive bonds between the contacts 32, 34 and contact pads (55) without thermally damaging the electronic package (31), heat-sensitive components (35) associated with the electronic package (31), or other the supporting substrate PCB.
Abstract:
L'invention concerne un circuit imprimé (10) comprenant un support (12), isolant dans les conditions normales de fonctionnement du circuit imprimé (10). Le circuit imprimé (10) porte au moins un composant (14) susceptible de provoquer accidentellement un échauffement indésirable d'une zone sensible (Z) du support (12). A cet effet, le circuit imprimé (10) comporte encore des moyens de détection de réchauffement de la zone sensible (Z). Les moyens de détection comprennent des moyens (26) sensibles à l'élévation de la conductivité du support (12) avec la température.
Abstract:
A semiconductor die package is disclosed. It may include a semiconductor die having a first surface and a second surface, and a leadframe structure. A molding material may be formed around at least a portion of the die and at least a portion of the leadframe structure. A solderable layer may be on the exterior surface of the molding material and the first surface of the semiconductor die.
Abstract:
A solder preform (20) is placed between two surfaces to be joined together. The preform has at least three solder wire limbs (21) which radiate outwardly from a centre (22). A cruciform shape is particularly advantageous. When the solder is heated, molten solder flows and expels trapped air from between the surfaces, thus reducing the void area in the joint which forms when the solder solidifies. The method and preform are particularly applicable to manufacture of opto-electronic modules.