Surface Insulation Resistance (SIR) is a critical parameter that measures the electrical insulation performance of a printed circuit board (PCB) surface, particularly under conditions of moisture and ionic contamination. It is essential for assessing the reliability and longevity of electronic assemblies, as low SIR values can lead to electrical failures and short circuits.

Surface Insulation Resistance (SIR)

Surface Insulation Resistance

Electrical insulation performance

A printed circuit board (PCB) is a foundational component in electronics, providing mechanical support and electrical connections for electronic components through conductive pathways etched from copper sheets laminated onto a non-conductive substrate. PCBs are essential for the miniaturization and functionality of modern electronic devices, playing a critical role in the manufacturing and assembly of complex circuits.

Printed Circuit Board

Moisture refers to the presence of a liquid, especially water, in trace amounts within a solid or gas. It plays a critical role in various natural and industrial processes, affecting everything from climate and agriculture to electronics and construction materials.

Moisture

Ionic Contamination

Reliability refers to the consistency and dependability of a system, process, or measurement over time. It is crucial for ensuring trust and accuracy in various fields, such as engineering, psychology, and statistics, where repeated results are essential for validation and decision-making.

Reliability

Longevity refers to the length of time that an individual lives, often focusing on extending the healthy and active years of life. It is influenced by a combination of genetic, environmental, and lifestyle factors, and is a major focus in fields like gerontology and biogerontology.

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