There are many factors that need to be considered when selecting a capacitor. The following information is a very professional discussion of the issues that need attention in the selection of capacitors.
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There are many factors that need to be considered when selecting a capacitor. The following two articles specifically discuss the selection elements of the two most commonly used capacitors: MLCC and aluminum electrolysis.
1. MLCC Selection: just not enough to meet the parameters of: general decision logic GuiJun Electronic Components Technology Network Analyst demand the purchase of goods is: can not be used, really easy to use, not durable resistance, price. In fact, this logic can also be applied to the MLCC selection process: First, the MLCC parameters to meet the circuit requirements, followed by the parameters and the medium can make the system work in the best state; again, whether the incoming MLCC defective products, how the reliability Finally, whether there is an advantage in price and whether the supplier's cooperation is timely. Many design engineers do not pay attention to passive components, and they think that it is only necessary to calculate the parameters theoretically. In fact, the selection of MLCCs is a complicated process, and it is not a simple matter to satisfy the parameters.
Selection Factors • Parameters: Capacitance, tolerance, voltage, temperature, size • Material • DC bias effect • Failure • Price and Availability
Different dielectric properties determine the different applications of MLCCs • C0G capacitors have high temperature compensation characteristics and are suitable as bypass capacitors and coupling capacitors • X7R capacitors are temperature stable ceramic capacitors suitable for less demanding industrial applications • Z5U capacitors are characterized by small size Low cost, especially suitable for decoupling circuits. • Y5V capacitors have the worst temperature characteristics, but they have a large capacity and can replace low-capacity
Aluminum Electrolytic Capacitors.
MLCC is commonly used in different media specifications such as C0G (NP0), X7R, Z5U, and Y5V. Different specifications have different characteristics and uses. The main difference between C0G, X7R, Z5U, and Y5V is that they have different filling media. In the same volume, the capacity of the capacitor formed by different filling media is different, and along with it, the dielectric loss and the capacity stability of the capacitor are also different. Therefore, when the capacitor is used, the capacitor should be used differently in the circuit. Use different capacitors.
