Moisture Absorption and its Effects on the Performance of Printed Circuit Materials

Liu, P. C.; Wang, D. W.; Fuerniss, Stephen J.; Poliks, Mark D.; Obrzut, Jan; Siperko, Lorraine M.; Chen, W. T.; Havens, Ross; Murcko, R.M.

doi:10.1557/proc-323-309

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…To examine the fitting effect of the humidity threshold model to the experimental data, residual analysis is necessary before the fitting model applies to the practical engineering. Because

{normale}_{i} = μ_{i} - {\overset{μ}{true}}_{i}

is the difference between measured value μ i and fitting value

{\overset{true^}{μ}}_{i}

, e i can be treated as random error of ε i . Then the rationality of the humidity threshold model is proved by the characters of residual error.…”

Section: Resultsmentioning

confidence: 99%

“…It is proved that points (q ( i ) ,e ( i ) ) are supposed to be in a line if e ( i ) [the subscript ( i ) stands for i th number of e ( i ) in an ordered list from smallest to largest] comes from normal distribution population, where q ( i ) is the expectation of e ( i ). The value of q ( i ) can be calculated by the equation

q_{((), i)} = \sqrt{italicMSE} \times φ (\frac{i - 0.5}{n})

, where

MSE = \frac{1}{n - p} \sum_{i = 1}^{n} e_{i}^{2}

φ (\frac{normali - 0.5}{n})

is the lower fractile of a standard normal distribution, which can be obtained by looking for in the Handbook of Table for Reliability Test . Then, the results of residual error and the normal probability are shown in Table and Figure .…”

Section: Resultsmentioning

confidence: 99%

“…In the presence of two biased points, a non‐tortuous path of adsorbed moisture will be preferentially created for ion migration in high temperature and humidity environment . Liu and Wang have suggested that improvement of the interface integrity may effectively depress or eliminate this ion migration . To be specific, the primary conduction path appears to be along interfaces between two oppositely biased and closely spaced electrodes.…”

Section: Humidity Threshold Modelmentioning

confidence: 99%

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Humidity Threshold Model of Numerical Control Multilayer Printed Circuit Board for Electrochemical Migration

Xie

Tang

Chen

et al. 2014

Quality & Reliability Eng

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In this paper, numerical control finished boards are employed as test samples to evaluate the effects of the environment and bias voltage on the surface insulation resistance of printed circuit boards. The results indicate that the surface insulation resistance degradation processes leading to failure exhibit a relative humidity threshold value, which is mostly related to temperature, test patterns, and bias voltage. Then, a humidity threshold model is built on the basis of electrochemical migration to quantify the relationship between the relative humidity threshold and conductor spacing and bias voltage under the controlled environments. Finally, experiments and tests have been carried out to validate the effectiveness and practicability of the model. Furthermore, the residual analysis is applied to check the fitting effect of the proposed model. According to the new model, the humidity threshold value can be obtained to provide the guidance for reliability problems in application. It is crucial to the design and deployment of reliable printed circuit boards. . Her main research interests include reliability analysis, reliability testing, reliability assessment, and reliability growth on numerical control system.Hangjun Zhang holds a Masters degree in Mechanical Engineering from the Tianjin University of Technology and Education, Tianjin, China. He is also a member

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“…To examine the fitting effect of the humidity threshold model to the experimental data, residual analysis is necessary before the fitting model applies to the practical engineering. Because

{normale}_{i} = μ_{i} - {\overset{μ}{true}}_{i}

is the difference between measured value μ i and fitting value

{\overset{true^}{μ}}_{i}

, e i can be treated as random error of ε i . Then the rationality of the humidity threshold model is proved by the characters of residual error.…”

Section: Resultsmentioning

confidence: 99%

q_{((), i)} = \sqrt{italicMSE} \times φ (\frac{i - 0.5}{n})

, where

MSE = \frac{1}{n - p} \sum_{i = 1}^{n} e_{i}^{2}

φ (\frac{normali - 0.5}{n})

Section: Resultsmentioning

confidence: 99%

Section: Humidity Threshold Modelmentioning

confidence: 99%

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Humidity Threshold Model of Numerical Control Multilayer Printed Circuit Board for Electrochemical Migration

Xie

Tang

Chen

et al. 2014

Quality & Reliability Eng

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show abstract

“…Moisture can instigate corrosion of copper traces or inflict damage on the substrate material, thereby affecting the PCB's electrical properties. [63,64] Additionally, moisture elevates the dielectric constant, curtailing the circuit switching speed and augmenting propagation delay time. [65,66] Particularly, moisture permeating the substrate can stimulate ionic corrosion, resulting in open and short circuits.…”

Section: Chemical Propertiesmentioning

confidence: 99%

Eco‐Friendly Materials for a Zero E‐Waste Society: Challenges and Opportunities in Engineering Plastics

Lee,

Huang,

Lee

et al. 2024

Advanced Sustainable Systems

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This review addresses the environmental challenges arising from the proliferation of plastic and electronic waste (E‐waste), driven by global economic and demographic expansion. Since the 1950s, the mass production of plastics has seriously threatened global sustainability, lacking effective post‐use management. E‐waste worsens the issue due to low recyclability and high toxicity. Resolving this requires improving biodegradability. The paper explores eco‐friendly biodegradable materials for a zero‐e‐waste society, focusing on multifunctional plastics in electronics, providing a comprehensive guide to material selection, and illustrating novel concepts through recent trials. The goal is fully biodegradable electronics, but transitioning from conventional material systems is complex. Notably, rendering engineering plastics in electronics biodegradable surpasses simply substituting conventional plastics. Thus, it is delved into various research initiatives focused on biodegradable materials for electronics, highlighting a systematic approach toward creating a fully integrated, biodegradable electronic system. This includes exploring the mechanisms of biodegradation and the integration of printed circuit boards (PCBs), a critical component in electronics. Achieving this represents a challenging but promising step toward a sustainable electronic future.

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Conductive Anodic Filament Failures in Fine-Pitch Through-Via Interconnections in Organic Package Substrates

Ramachandran

Liu

Raj

et al. 2012

Journal of Elec Materi

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Moisture Absorption and its Effects on the Performance of Printed Circuit Materials

Cited by 4 publications

References 7 publications

Humidity Threshold Model of Numerical Control Multilayer Printed Circuit Board for Electrochemical Migration

Humidity Threshold Model of Numerical Control Multilayer Printed Circuit Board for Electrochemical Migration

Eco‐Friendly Materials for a Zero E‐Waste Society: Challenges and Opportunities in Engineering Plastics

Conductive Anodic Filament Failures in Fine-Pitch Through-Via Interconnections in Organic Package Substrates

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