Surface-Mount Passive Component With Size Conversion Terminals
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Solution Overview
Problem
As passive elements, such as inductors, become smaller for mounting on circuit boards in devices like smartphones, they become increasingly difficult to mount effectively due to size constraints.
Innovation Solution
A surface-mount passive component configuration that includes a passive element mounted on a size conversion unit, where the passive element's first main surface is closer to the size conversion unit than its second main surface, allowing for a larger board-side mount surface area and increased terminal size, facilitating easier mounting without enlarging the passive element itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the passive element size is reduced, then the component can be mounted on small circuit boards, but the mounting difficulty increases
Solution Approach 1:
The component is segmented into two distinct parts: a small passive element (inductor, capacitor, or resistor) and a larger size conversion unit. The passive element maintains its small size for circuit board compatibility, while the size conversion unit provides a larger mounting surface and extended terminals, effectively separating the functional size requirements from the mounting size requirements.
Solution Approach 2:
The size conversion unit acts as an intermediary between the small passive element and the circuit board. It receives the small passive element on its element mount surface and provides a larger board-side mount surface with extended external terminals, facilitating easier mounting and connection without requiring the passive element itself to be large.
2Volume of moving object
If the passive element size is reduced, then miniaturization is achieved, but the terminal contact area with circuit board electrodes decreases
Solution Approach 1:
The solution extends the terminal structure into a third dimension by incorporating a size conversion unit that protrudes from the circuit board surface. The board-side mount surface and extended external terminals provide increased contact area in the vertical dimension, compensating for the reduced horizontal contact area of the miniaturized passive element.
3Productivity
If the passive element size is reduced, then component density increases, but mounting precision requirements increase
Solution Approach 1:
The size conversion unit serves as a mounting intermediary that absorbs positioning tolerances. Its larger board-side mount surface and extended terminals provide more robust mechanical and electrical connection points, reducing the impact of positioning errors and lowering the required mounting precision for the small passive element.
Data Source
AI summary
A surface-mount passive component includes a passive element and a size conversion unit on which the passive element is mounted. The size conversion unit has a body, a plurality of first external terminals each of which is exposed on an element mount surface of the body and is electrically connected to a corresponding one of passive element external terminals of the passive element, a plurality of second external terminals exposed on a board-side mount surface of the body, and connection wires that electrically connect the first external terminals and the second external terminals. An area of the board-side mount surface is larger than an area of a first main surface of the passive element, and a total area of the plurality of second external terminals on the board-side mount surface is larger than a total area of the passive element external terminals on the first main surface.