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Definition of "UBM" |
Underbump metal / Underbump metal Under-Bump Metallurgy, / Under Bump Metallization is to a flip chip bump what a foundation is to a house: the essential base that supports the whole structure. Like a foundation, too, the UBM is mostly out of sight, and little thought about -unless there are problems with it. UBM, for most flip chip processes, is the first step in bumping the integrated circuit (IC) bond pads. |
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