Opposing-Electrode Package Structure for Reliable PCB Surface Mounting

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Solution Overview

Problem

Existing electrical devices with opposing-electrodes configuration are not suitable for surface-mounting applications, as they lack a suitable packaging format for easy mounting on circuit boards.

Innovation Solution

A packaged device is designed with first and second electrodes on opposite sides of a body, sandwiched between first and second terminal assemblies, connected via conductive pins or wires, and optionally encapsulated with an insulator filler to facilitate surface mounting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If electrical devices with opposing-electrodes configuration are used, then electrical functionality is achieved, but surface-mounting capability is lost

Engineering Contradiction:

Improvesurface-mounting capabilityVSAvoidpackaging structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The electrical device with opposing electrodes is nested within a packaging structure that includes a body and two terminal assemblies. The first electrode connects to the first terminal assembly and the second electrode connects to the second terminal assembly, creating a nested configuration that enables surface-mounting while preserving the opposing-electrode functionality.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The body and terminal assemblies act as intermediaries that bridge the opposing electrodes of the electrical device to external circuit board terminals. This intermediary packaging structure transforms the incompatible opposing-electrode configuration into a compatible surface-mountable form factor.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If electrical device is sandwiched between terminal assemblies, then electrical connections are established, but thermal expansion mismatch occurs

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidthermal expansion mismatch

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs materials and structural designs that account for and compensate for thermal expansion differences between the electrical device, terminal assemblies, and circuit board. The body and terminal assembly materials are selected to minimize thermal expansion mismatch, and the packaging structure is designed to accommodate thermal stresses while maintaining reliable electrical connections.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250336575A1Packaged electrical devices and related methods

Publication Date: 2025.10.30 BOURNS INC

AI summary

In some embodiments, a packaged device can include an electrical device having first and second electrodes implemented on opposite sides of a body. The electrical device can be sandwiched between first and second terminal assemblies, with the first and second terminal assemblies being configured to provide the packaged device with a surface mount device (SMD) format, thereby allowing the electrical device to be easily mounted on a surface of a circuit board.