Abstract:
A solder-bearing lead, and methods of fabricating and using it, where the lead is formed with a solder-retaining portion having a cross-sectional profile with undercuts and a tip, preferably in a V-shape, where solder surrounds said solder-retaining portion and undercuts, and extends outwardly substantially no farther than said tip.
Abstract:
For packaging a semiconductor device, a metal plate is formed to include a central plate portion and a peripheral plate portion extending outwardly from the central plate portion. The central plate portion has a first surface for mounting the semiconductor device and has a second surface opposite to the first surface in a predetermined direction. The peripheral plate portion is bent to face the second surface of the central plate portion and extends substantially along a reference plane which is perpendicular to the predetermined direction. The peripheral plate portion has a particular portion projecting from the reference plane opposite the central plate portion. An insulator layer is deposited on the metal plate. In addition, a conductive pattern is formed on the insulator layer. The insulator layer extends along the metal plate from the first surface of the central plate portion to the peripheral plate portion to cover the particular portion. The conductive pattern extends along the insulator layer from the central plate portion to the particular portion.
Abstract:
A lead frame having a plurality of inner leads and outer leads, said outer leads being subjected to surface treatment for improving solder wettability at an end portion and to sruface treatment for suppressing solder wettability at least at a portion neighboring to the end portion, or said outer leads being bent 4 times or more, is effective for improving thermal fatigue life and reliability when applied to a semi-conductor device.
Abstract:
A power semiconductor device for surface mounting includes an isolating body, a thermal dissipator and electrical connection pins. The pins and legs of the thermal dissipator extend in the direction of the lower surface of the body. During a surface mounting operation of the device on a substrate, a quantity of solder is enclosed by a capillary effect under the major part of the plate. Thus, a good electrical and thermal contact is obtained with a metallization of the substrate.
Abstract:
A connector is described, of a type which can be connected to a circuit board by merely laying it on the board and soldering it in place by a reflow solder technique. The connector includes a housing assembly with a substantially flat bottom that includes a solderable portion that can lie on a metal trace of a circuit board to be soldered thereto. The connector includes a row of contacts, each having a main portion within the housing and a tail extending at a downward incline from the housing so the lower end of the tail can contact a metal trace on the circuit board and become soldered thereto.