Reduced impedance and superconductivity of SnAgCu solder alloy at high frequency

Wei Yao; Cemal Basaran

doi:10.1007/s13391-012-2054-6

Reduced impedance and superconductivity of SnAgCu solder alloy at high frequency

Wei Yao
, Cemal Basaran

Department of Civil, Structural & Environmental Engineering

SUNY Buffalo

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Skin effect of lead-free solder joints is investigated over a wide frequency band. Contrary to common believe that 'effective impedance of solder alloys increases with frequency', resistance tends to saturate when frequency reaches a critical value, 10 MHz for SAC solder alloys. Negative surface impedance growth rate is observed when employs square waveform AC current loading at high current density. Further increased frequency causes a dramatic reduction of effective resistance. At 11 MHz with current density of 106 A/cm ², effective resistance of solder alloy drops to near zero value.

Original language	English
Pages (from-to)	503-505
Number of pages	3
Journal	Electronic Materials Letters
Volume	8
Issue number	5
DOIs	https://doi.org/10.1007/s13391-012-2054-6
State	Published - Oct 2012

Keywords

high frequency AC
reduced impedance
skin effect

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10.1007/s13391-012-2054-6

Cite this

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title = "Reduced impedance and superconductivity of SnAgCu solder alloy at high frequency",

abstract = "Skin effect of lead-free solder joints is investigated over a wide frequency band. Contrary to common believe that 'effective impedance of solder alloys increases with frequency', resistance tends to saturate when frequency reaches a critical value, 10 MHz for SAC solder alloys. Negative surface impedance growth rate is observed when employs square waveform AC current loading at high current density. Further increased frequency causes a dramatic reduction of effective resistance. At 11 MHz with current density of 106 A/cm 2, effective resistance of solder alloy drops to near zero value.",

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AB - Skin effect of lead-free solder joints is investigated over a wide frequency band. Contrary to common believe that 'effective impedance of solder alloys increases with frequency', resistance tends to saturate when frequency reaches a critical value, 10 MHz for SAC solder alloys. Negative surface impedance growth rate is observed when employs square waveform AC current loading at high current density. Further increased frequency causes a dramatic reduction of effective resistance. At 11 MHz with current density of 106 A/cm 2, effective resistance of solder alloy drops to near zero value.

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KW - reduced impedance

KW - skin effect

UR - https://www.scopus.com/pages/publications/84868005325

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Reduced impedance and superconductivity of SnAgCu solder alloy at high frequency

Abstract

Keywords

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