In the process of SMT patch processing, resistance capacitor is a very common component. In the market, it can be said that the resistance capacitor is very mixed. When purchasing capacitor products, many customers often buy fake and inferior products, defective products and other problematic products, so everyone should have the ability to identify basic capacitor. Here's how to tell the difference between a good chip capacitor and a bad one.
Capacitor appearance difference and influence:
High quality capacitance:
1. The size and precision of the product are relatively high, which can improve the efficiency of automatic installation and soldering.
2. The terminals on both sides of the product are not easy to be oxidized, the color is positive, and the solder yield is relatively high.
Bad patch capacitor
1. The size of the product is not correct, in the process of automatic installation will often lead to and solder joint dislocation, so that the solder is not correct, the product defect rate will be greatly improved.
2. The terminals on both sides of the product are easy to oxidize and blacken, which will affect the efficiency of the solder.
In addition to the big differences between poor patch capacitors and high-quality capacitors in appearance and installation, there will also be many problems during smt production and use, such as:
1. Poor internal structure ratio or immature firing process will lead to unstable internal structure of capacitor in patch processing, which is easy to break.
2. Poor capacitance manufacturers reduce processes to reduce costs, resulting in low capacity.
3. Product parameters are not up to standard and shoddy filling will cause high loss in the use of the product, thus reducing the service life of the capacitor.
4. The material of capacitor medium will be shoplifted, resulting in small IR value, which is prone to leakage.
5. The pressure resistance will be insufficient, and the low-voltage capacitor will be pretended to be the high-voltage capacitor, which will make the capacitor breakdown and burn in the process of using the product, greatly increasing the defect rate of the product.
