Lead frames for mounting ceramic electronic parts, particularly

Details Lead frames for mounting ceramic electronic parts, particularly Lead frames for mounting ceramic electronic parts, particularly

1998-05-28

2000-06-27

Kincaid, Kristine

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

361813, 3613212, H01G 220

Patent

active

060814160

ABSTRACT:
A ceramic electrical device or component, normally a barium titanate ceramic capacitor, having a first coefficient of thermal expansion (CTE), typically about 10 parts per million per degree centigrade (10 ppm/.degree.C.), is physically and electrically mounted through an intermediary solder layer, normally copper, to a lead frame, normally made from a selected alloy of nickel-iron, having a second CTE at least one-fifth (20%) less, and more typically about 5 ppm/.degree.C., or one-half (50%) less, than is the CTE of the ceramic capacitor. Because ceramics are stronger in compression than in tension, the ceramic capacitor held within the lead frame is less likely to undergo a stress fracture at temperatures elevated above those of assembly than would be the case should the CTE's be equal, or should the CTE of the lead frame be greater than the CTE of the ceramic capacitor. Leaded ceramic capacitors, stacked multilayer ceramic capacitors, ceramic inductors and ceramic resistors so constructed satisfy United States standards for electronic components used in broad-temperature-range demanding military and space applications.

REFERENCES:
patent: 3946290 (1976-03-01), Yoshioka et al.
patent: 4151579 (1979-04-01), Stark
patent: 4594641 (1986-06-01), Hernandez
patent: 4630170 (1986-12-01), Kask et al.

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