# US 2022/0285490 A1 · Digital isolator

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- Number: US 2022/0285490 A1
- Document ID: US20220285490A1
- Status: Published application
- Kind: A1
- Application number: 17/525,285
- Filed: 2021-11-12
- Published: 2022-09-08
- Earliest claimed: 2021-03-02
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Inventors: Nobuhide YAMADA
- Web page: https://patentgrep.com/patent/US20220285490A1

## CPC

- H04B 1/16: Circuits
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 38/50: {Transformers for galvanic isolation}
- H04B 1/04: Circuits
- H04L 25/0266: {Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling}
- H10D 1/20: Inductors
- H10W 44/501: {Inductive arrangements (H10W44/20 takes precedence)}
- H01F 27/2871: {Pancake coils}
- H04B: TRANSMISSION
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A digital isolator according to an embodiment includes a first electrode, a first insulating part, a second electrode, a second insulating part, and a first dielectric part. The first insulating part is located under the first electrode. The second electrode is located under the first insulating part. The second insulating part is located around the first electrode along a first plane perpendicular to a first direction. The first direction is from the second electrode toward the first electrode. The first dielectric part is located between the first electrode and the second insulating part in a second direction along the first plane. The first dielectric part contacts the first electrode. A relative dielectric constant of the first dielectric part is greater than a relative dielectric constant of the first insulating part.

## Claims

### Claim 1

A digital isolator, comprising:
a first electrode;
a first insulating part located under the first electrode;
a second electrode located under the first insulating part;
a second insulating part located around the first electrode along a first plane perpendicular to a first direction, the first direction being from the second electrode toward the first electrode; and
a first dielectric part located between the first electrode and the second insulating part in a second direction along the first plane,
the first dielectric part contacting the first electrode,
a relative dielectric constant of the first dielectric part being greater than a relative dielectric constant of the first insulating part.

### Claim 2 (depends on 1)

The isolator according to claim 1, wherein
a width in the second direction of the second insulating part is greater than a width in the second direction of the first dielectric part.

### Claim 3 (depends on 1)

The isolator according to claim 1, wherein
the first electrode is a coil that has a spiral shape along the first plane,
the isolator further comprises a first intermediate dielectric part located between the coil along the first plane, and
a relative dielectric constant of the first intermediate dielectric part is greater than the relative dielectric constant of the first insulating part.

### Claim 4 (depends on 1)

The isolator according to claim 1, further comprising:
a third insulating part located around the second electrode along a second plane perpendicular to the first direction; and
a second dielectric part located between the second electrode and the third insulating part in the second direction,
the second dielectric part contacting the second electrode,
a relative dielectric constant of the second dielectric part being greater than the relative dielectric constant of the first insulating part.

### Claim 5 (depends on 4)

The isolator according to claim 4, wherein
a width in the second direction of the third insulating part is greater than a width in the second direction of the second dielectric part.

### Claim 6 (depends on 4)

The isolator according to claim 4, wherein
the second electrode is a coil that has a spiral shape along the second plane,
the isolator further comprises a second intermediate dielectric part located between the coil along the second plane, and
a relative dielectric constant of the second intermediate dielectric part is greater than the relative dielectric constant of the first insulating part.

### Claim 7

A digital isolator, comprising:
a first electrode;
a first insulating part located under the first electrode;
a second electrode located under the first insulating part;
a conductive body located at a position separated from the first electrode in a second direction perpendicular to a first direction, the first direction being from the second electrode toward the first electrode;
a second insulating part located between the first electrode and the conductive body in the second direction;
an upper insulating part located on the first electrode and the conductive body; and
a first dielectric layer located inside the upper insulating part and positioned on one of the first electrode or the conductive body,
a relative dielectric constant of the first dielectric layer being greater than a relative dielectric constant of the second insulating part.

### Claim 8 (depends on 7)

The isolator according to claim 7, further comprising:
a second dielectric layer located inside the upper insulating part and positioned on the other of the first electrode or the conductive body,
a relative dielectric constant of the second dielectric layer being greater than the relative dielectric constant of the second insulating part.