# US 2022/0093343 A1 · Low Inductance Electrolytic Capacitor

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- Number: US 2022/0093343 A1
- Document ID: US20220093343A1
- Status: Published application
- Kind: A1
- Application number: 17/465,933
- Filed: 2021-09-03
- Published: 2022-03-24
- Earliest claimed: 2020-09-23
- Assignees: AVX Corporation
- Applicants: AVX Corporation
- Inventors: Jeffrey Cain
- Web page: https://patentgrep.com/patent/US20220093343A1

## CPC

- H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence)
- H01G 9/012: specially adapted for solid capacitors
- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/0525: {Powder therefor}
- H01G 9/08: Housing; Encapsulation
- H01G 9/008: Terminals
- H01G 2009/05: {consisting of tantalum, niobium, or sintered material; Combinations of such electrodes with solid semiconductive electrolytes, e.g. manganese dioxide}
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)

## Abstract

A capacitor that is capable of exhibiting good electrical properties under a wide variety of different conditions is provided. The capacitor contains a capacitor element that includes a sintered porous anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric and includes a conductive polymer. The capacitor also contains multiple exposed anode lead portions that are electrically connected to respective anode terminations and a planar cathode termination that is electrically connected to the solid electrolyte.

## Claims

### Claim 1

A solid electrolytic capacitor comprising:
a capacitor element comprising a sintered anode body, a dielectric that overlies the anode body, and a solid electrolyte that overlies the dielectric, wherein the solid electrolyte includes a conductive polymer, wherein the capacitor element defines opposing first and second ends and opposing upper and lower surfaces;
a first exposed anode lead portion extending from the first end of the capacitor element;
a first anode termination that is electrically connected to the first exposed anode lead portion;
a second exposed anode lead portion extending from the second end of the capacitor element;
a second anode termination that is spaced apart from the first anode termination and electrically connected to the second exposed anode lead portion; and
a planar cathode termination that is positioned adjacent to the lower surface of the capacitor element and electrically connected to the solid electrolyte.

### Claim 2 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the first anode termination, the second anode termination, or both include a planar portion that is generally parallel with a lower surface of the capacitor element.

### Claim 3 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the first anode termination, the second anode termination, or both include a planar portion that is substantially in the same plane as the cathode termination.

### Claim 4 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the cathode termination is generally parallel with a lower surface of the capacitor element.

### Claim 5 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the anode body includes tantalum and the dielectric includes tantalum pentoxide.

### Claim 6 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the solid electrolyte contains at least one layer formed from a dispersion of conductive polymer particles.

### Claim 7 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the conductive polymer includes poly(3,4-ethylenedioxythiophene), or a derivative thereof.

### Claim 8 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the anode body is formed from a valve metal powder having a specific charge of from about 5,000 to about 100,000 μF*V/g.

### Claim 9 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the anode body is formed from a valve metal powder having a specific charge of from about 100,000 to about 600,000 μF*V/g.

### Claim 10 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein a first anode lead is embedded in the anode body that includes the first exposed anode lead portion and an embedded portion.

### Claim 11 (depends on 10)

The solid electrolytic capacitor of claim 10, further comprising a second anode lead that includes the second exposed anode lead portion.

### Claim 12 (depends on 11)

The solid electrolytic capacitor of claim 11, wherein the second anode lead is connected to an end of the anode body.

### Claim 13 (depends on 12)

The solid electrolytic capacitor of claim 12, wherein a gap exists between an end of the embedded portion and the end of the anode body.

### Claim 14 (depends on 10)

The solid electrolytic capacitor of claim 10, wherein the second anode lead is embedded in the anode body and includes an embedded portion.

### Claim 15 (depends on 14)

The solid electrolytic capacitor of claim 14, wherein a gap exists between an end of the embedded portion of the first anode lead and an end of the embedded portion of the second anode lead.

### Claim 16 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein a continuous anode lead extends through the first end and the second end of the capacitor element, thereby defining the first exposed anode lead portion and the second exposed anode lead portion.

### Claim 17 (depends on 1)

The solid electrolytic capacitor of claim 1, further comprising a housing that encloses the capacitor element and leaves exposed at least a lower surface of the cathode termination.

### Claim 18 (depends on 17)

The solid electrolytic capacitor of claim 17, further comprising a housing that encloses the capacitor element and leaves exposed at least a lower surface of the first anode termination, the second anode termination, or both.

### Claim 19 (depends on 18)

The solid electrolytic capacitor of claim 18, where the exposed lower surface of the cathode termination is generally in the same plane as the exposed lower surface of the first anode termination, the second anode termination, or both.

### Claim 20 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the capacitor exhibits an impedance of about 1 ohm or less over a frequency range of from about 1 kHz to about 100 MHz.

### Claim 21 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the solid electrolytic capacitor exhibits about 40 dB or more of attenuation (S21 parameter) over a frequency range of from about 0.1 MHz to about 500 MHz.

### Claim 22 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the solid electrolytic capacitor exhibits about 20 dB or more of attenuation (S21 parameter) over a frequency range of from about 500 MHz to about 10 GHz.

### Claim 23 (depends on 1)

The solid electrolytic capacitor of claim 1, wherein the capacitor exhibits an ESR of about 800 mohms or less, as determined at an operating frequency of 100 kHz and temperature of 23° C.