Inductor Ground Electrode Structure for Coplanar Soldering
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Solution Overview
Problem
The conventional magnetic devices, such as inductors, suffer from soldering failures due to significant height discrepancies between the ground electrode and other electrodes, affecting coplanarity and leading to poor soldering quality.
Innovation Solution
The magnetic device is designed with a structure where the ground electrode is formed with multiple conductive layers, and its peak surface is aligned within 50 um of the other electrodes' peak surfaces, ensuring uniform height alignment and improved soldering quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ground electrode is made with conventional structure, then the electrode can be easily manufactured, but the height difference between ground electrode and other electrodes causes poor coplanarity and soldering failures
Solution Approach 1:
The ground electrode is designed with a stepped structure that extends in multiple dimensions, creating different height levels (first, second, and third portions at different heights) to match the coplanarity requirements of other electrodes while maintaining electrical connectivity through vertical conductive paths
Solution Approach 2:
The ground electrode is divided into multiple segmented portions (first portion, second portion, third portion) with different heights and functions, where each segment serves specific purposes: the first portion provides low-height grounding, the second portion provides mid-height grounding, and the third portion provides high-height grounding and electrical connection to the conductive wire
Data Source
AI summary
A recess is formed on a bottom surface of a body of an inductor, wherein an electrode for connecting to a ground is disposed in the recess, and an electrode connecting with a coil of the inductor is disposed on a protruding portion adjacent to the recess.