Professional Capacitor Selection Points

Factors to consider when choosing shapes capacitance a lot, the following two articles dedicated to exploring the MLCC, the two most common aluminum electrolytic capacitor element selected shape.

1. MLCC Selection: Parameter is not enough merely to meet

OF: Guangxi Province Electronic Components and Technology Network Products Demand Analyst

Purchases of general decision-making logic is: can not be used, really easy to use, not durable resistance, prices. In fact, this logic can also be applied to the MLCC selection process: First MLCC circuit parameters to meet the requirements, followed by the parameters and the media is to make the system work in the best condition; again, the incoming MLCC if there are bad products, how reliability ; and finally, whether the price advantage, suppliers with timely. Many designers do not pay attention to passive components, that theory alone can calculate the parameters on the line, in fact, MLCC selection is a complex process, not simply meet the parameters possible.

Selection Factors

? Parameters: capacitance values, tolerances, pressure, temperature, size

? Material

? DC bias effect

? Failure

? Price and Availability

Determine the performance of different media for different applications MLCC

? C0G capacitor having a high temperature compensation, suitable for bypass capacitance and coupling capacitance

? X7R capacitors are temperature-stable ceramic capacitors, suitable for less demanding industrial applications

? Z5U capacitor is characterized by small size and low cost, especially suitable for decoupling circuit

? Y5V capacitor temperature characteristics of the worst, but the capacity can be replaced by low capacity aluminum electrolytic capacitor

MLCC commonly used C0G (NP0), X7R, Z5U, Y5V specifications such as different media, different sizes have different characteristics and uses. C0G, the main difference X7R, Z5U and Y5V are they fill a different medium. In the same volume due to the different filling media capacity of a capacitor formed on different dielectric loss, the capacity of the capacitor and brought stability and the like is different, it should be used in accordance with the capacitor in the capacitor circuit to the role of the different use different capacitors.

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