High ESR or fused ceramic chip capacitor
View Patent ↗A fused or high ESR ceramic capacitor for power applications has a fuse or resistor inserted between an end termination and a terminal for one set of alternating conductive plates in the capacitor. The length and thickness of the fuse allows adjustment of the current capability of the fail-open device which provides protection for the circuit in the event of short-circuiting, or the pattern created by the thick-film resistor application defining the added ESR for the capacitor.
1. A surface mount ceramic capacitor having interleaved conductive plates and ceramic insulating layers further comprising:
a) terminals of one set of alternating conductive plates formed at an end surface of said capacitor;
b) terminals of a second set of alternating conductive plates formed at a side surface of said capacitor;
c) conductive end terminations for connection to printed circuit board;
d) a fuse connection formed on the surface between said terminal of said second set of alternating conductive plates and a termination not connected to said terminal of one set of alternating conductive plates,
e) or resistive pattern formed on the surface between said terminal of said second set of alternating conductive plates and a termination not connected to said terminal of one set of alternating conductive plates.
2. A ceramic capacitor according to claim 1 further comprising a passivating layer between said fuse or resistor connection and said ceramic insulating layer.
3. A ceramic capacitor according to claim 1 wherein said terminal of a second set of conductive plates is on a side surface which is in a plane 90° to the plane of the end termination planes.
4. A ceramic capacitor according to claim 2 further comprising an insulating layer on said fuse on a side away from said passivating layer.