Abstract:
A silicon semiconductive element is provided with first and second spaced contact surfaces. A beveled peripheral edge extends from the first contact surface and intersects a first junction, and a second peripheral edge extends from the second contact surface to the beveled edge and intersects a second junction. A ceramic preform surrounds the semiconductive element with a surface conforming to one of the peripheral edges of the element. The preform has a thermal coefficient of expansion substantially matching that of the silicon thyristor element. A glass passivant bonds the one peripheral edge of the element to the conforming surface of the preform. The glass passivant also overlies a remaining of the peripheral edges and is spaced from the preform adjacent this edge. The glass passivant has a thermal coefficient of expansion in excess of that of silicon and below 45 X 10 7/*C., a firing temperature below that of the preform, and a maximum thickness less than 1 mil. Contacts are associated with the first and second contact surfaces and are sealingly associated with the preform.
Abstract:
IN A RECTIFIER A SILICON CRYSTAL CONTAINING A JUNCTION IS PROVIDED WITH A BEVELED PERIPHERY HAVING A GLASS LAYER THEREON WHICH EXHIBITS A THERMAL EXPANSION DIFFERENTIAL WITH RESPECT TO THE SEMICONDUCTIVE CRYSTAL OF LESS THAN 5X10**-4, A DIELECTRIC STRENGTH OF AT LEAST 100 VOLTS/MIL, AND AN INSULATIVE RESISTANCE OF AT LEAST 10**10 OHM-CM. SILCON RUBBER OVERLIES THE GLASS LAYER ACTING AS A SHOCK PROTECTION SHIELD AND AS A SUPPLEMENTARY PASSIVATION LAYER. THE SILICONE RUBBER EXHIBITS A DIELECTRIC STRENGTH OF AT LEAST 100 VOLTS/MIL AND AN INSULATION RESISTANCE OF AT LEAST 10**10 OHM-CM. ELECTRICAL CONTACT TO THE SILICON CRYSTAL IS PROVIDED THROUGH A SOLDER LAYER HAVING A MODULUS OF ELEASTICITY OF LESS THAN 1.1X10**7.
Abstract:
A RE-Ba-Cu-O type oxide superconducting material (RE represents Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu or a combination of two or more of them) having a phase structure including a REBa.sub.2 Cu.sub.3 O.sub.y phase and a RE.sub.2 BaCuO.sub.5 phase of 20 .mu.m or less in diameter dispersed in the REBa.sub.2 Cu.sub.3 O.sub.y phase, in which superconducting material RE consists of at least two elements selected from Y, Cl, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu. Said oxide superconducting material can be produced by melt processing.
Abstract:
A semiconductor device comprises a substrate, a first semiconductor pellet mounted on the substrate, an insulating material washer mounted on the first pellet, and a second semiconductor pellet mounted on the washer. The second pellet is rigidly secured to the washer and the first pellet, and electrically connected to the first pellet, by means of a solder filling the washer central opening and bonded to both pellets.
Abstract:
The main electrodes of a sealed semiconductor device are clamped between opposing metal members of a pressure assembly, and gaps between opposite ends of the insulating sidewall of the device and the respectively adjacent metal members are closed by resilient O-rings disposed in compression in the gaps and respectively circumscribed by rigid retaining rings.
Abstract:
A package for a transistor or other semiconductor device wherein a semiconductor crystal is connected to a first thermal conducting ceramic layer and enclosed within a cavity created by a second thermal conducting ceramic layer. Openings in at least one of the thermal conducting ceramic layers are filled with a conductive material, the material making electrical contact with the active regions of the semiconductor device. Metal contacts are connected to the thermal conducting ceramic layer making electrical contact with the conductive material in the openings, and therefore making electrical contact with the active regions of the semiconductor device.
Abstract:
A microwave transistor package is disclosed which utilizes a disc of beryllium oxide. One surface of the disc is metallized to form a symmetrical pattern of four contacts. These include a collector contact and a base contact oppositely disposed along one diameter of the disc. The remaining two contacts are oppositely disposed along a second diameter perpendicular to the first. They are substantially wider than the collector and base contacts and comprise double emitter contacts. The transistor is mounted on the collector contact and a wire connects its base to the base contact. An emitter wire connects both of the metallized emitter contacts and its midpoint is connected to the emitter of the transistor. The package is hermetically sealed by means of a beryllium oxide cap enclosing the transistor and ''''glassed'''' to the disc.