摘要:
A hybrid integrated circuit having a lead frame electrically connected to electronic components by means of a silver (Ag) paste, the hybrid integrated circuit comprising: an electroless-plated coating on the lead frame, the coating being free from an insulating surface oxide layer at least in a connection area in which the electrical connection is provided. A process of producing this hybrid integrated circuit comprises: a first step of electroless-plating a lead frame by using a phosphorus-containing reducing agent to form a coating on the lead frame; a second step of mounting electronic components on the lead frame and then electrically and mechanically connecting the former to the latter by means of an electroconductive paste; and a third step of maintaining the surface of the electroless-plated coating free from a phosphorus-containing oxide layer during the connecting operation.
摘要:
A semiconductor element mounted on a board is sealed with a sealing resin, The semiconductor element is electrically bonded to the board through a soldering bump. The sealing resin includes a silicone gel as a base resin and a filler filled into a silicone gel. A diameter of the filler is equal to or shorter than the distance between the semiconductor element and the board, and a shape of the filler is spherical to improve a thermal conductivity of the sealing resin. The relationship between a coefficient .alpha. of a linear expansion and a complex modulus of elasticity G* of the sealing resin is defined as follows to reduce a force pushing up the semiconductor element:.alpha..ltoreq.0.033(G*-451).sup.-0.56.
摘要:
A semiconductor strain sensor having a stem with a lead hole in which a lead terminal is installed and electrically coupled to an external circuit. A sensor chip having piezo-resistors to a bride circuit is joined with a front surface of the stem. A shell is joined with the front surface of the stem by projection welding after the back surface of the stem is flattened to within a predetermined limit. A space formed by the shell and stem is filled with a damping liquid. The stem is integrally coupled to the sensor chip through an adhesive, and spacers are added to the adhesive to keep the thickness of the adhesive to a predetermined value. This arrangement can effectively prevent propagation of the welding strain of the stem from adversely affecting the sensor chip.
摘要:
A semiconductor element mounted on a substrate is sealed with a silicone gel which has a complex modulus of elasticity such that breakage of solder bumps due to thermal fatique occurs preferentially by shear stress thereto due to a difference between thermal expansion coefficients of the semiconductor element and the substrate, not by tension thereto due to thermal expansion of the silicone gel between the semiconductor element and the substrate.