There are many types of SMD capacitors, which can be classified in various ways. The following are several main classification perspectives and their common types:
The phenomenon of low capacitance of surface mount capacitors (especially MLCC) when tested directly with a capacity of over 1uF is usually caused by the following key factors:
The storage time of capacitors is significantly affected by the type, storage conditions, and packaging process, with significant differences among different types. The following is a storage guide that integrates the characteristics of various capacitors:
Capacitor breakage is a common problem in electronic production, especially in ceramic capacitors (MLCC), which can lead to early product failure or reduced reliability. Preventing and controlling capacitor breakage requires comprehensive management from multiple aspects such as design, materials, processes, equipment, operation, and environment. Here are some key prevention and control measures:
Surface mount capacitors (especially multi-layer ceramic capacitors - MLCC) are prone to breakage or terminal detachment, mainly due to their own structure, material properties, and the combined effect of external stress. The following are the main reasons:
Capacitors can have polarity or not, depending on the type and internal structure of the capacitor.
The intuitive manifestations of capacitor failure are diverse, depending on the type of capacitor, its role in the circuit, and the severity of the failure. Here are some of the most common intuitive expressions that can be discovered through observation or simple operation:
After discovering a capacitor failure, the core remedial measure is to replace the faulty capacitor. This is a process that requires careful handling, especially when dealing with high voltage or precision equipment.
The impact of capacitor failure on circuits is extensive and severe, depending on the role of the capacitor in the circuit, failure modes (open circuit, short circuit, reduced capacity, increased ESR, increased leakage current, etc.), and the design of the circuit itself. Here are some of the main impacts:
There are various reasons for capacitor failure, which can be mainly attributed to the following categories:
