Tantalum Capacitor with Polymer Cathode
AssigneeKemet Electronics Corporation
InventorsYuri Freeman, Steven C. Hussey, Jimmy Dale Cisson, Philip M. Lessner
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Abstract
An improved capacitor and a method for forming an improved capacitor is detailed. The method comprises forming a tantalum anode from a tantalum powder with a powder charge of no more than 40,000 μC/g; forming a dielectric on the anode by anodization at a formation voltage of no more than 100 V; and forming a conductive polymeric cathode on the dielectric wherein the capacitor has a breakdown voltage higher than the formation voltage.
Claims26
A method for forming a capacitor comprising:
- forming a tantalum anode from a tantalum powder with a powder charge of no more than 40,000 μC/g;
- forming a dielectric on said anode by anodization at a formation voltage of no more than 100 V;
- forming a conductive polymeric cathode on said dielectric;
- and
- wherein said capacitor has a breakdown voltage higher than said formation voltage.
The method for forming a capacitor of claim 7 wherein said formation voltage is at least 40 volts.
A capacitor comprising:
- a tantalum anode;
- a dielectric on said anode;
- and
- a conductive polymeric cathode on said dielectric;
- wherein said capacitor has a breakdown voltage of at least 1 V to no more than 100 V and an open circuit failure mode when exposed to voltage above said breakdown voltage.
Dependencies are inferred from the claim text.