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SMD capacitor how does it identify the size of the capacitor capacity

163.com | 21/04/2021

The shape of the chip capacitor is similar to the chip resistor. Usually, the chip capacitor has a white substrate, and most of the tantalum electrolytic capacitors have a black substrate, but the positive side is also marked with a white polarity. Many chip capacitors cannot be labeled due to their size limitations. How do you look at the size of the chip capacitors?

How to identify the size of the chip capacitor? Many chip capacitors cannot be labeled due to their volume limitations, so they are generally marked on the entire plate when the chip is produced. If it is a single chip capacitor, it is necessary to measure its capacity with a capacitance tester. If it is the same factory label, generally speaking, the capacity of the darker color is larger than that of the lighter color, brown gray>light purple>grey white. Of course, the best way is to blow it down with a hot air gun, wait for it to cool down, and use the capacitor block of the digital meter or the meter to measure it.

How to judge the capacity of the chip capacitor? Generally speaking, there is no silk screen for SMD capacitors. Therefore, if you look at it visually, the larger the volume, the larger the capacity, but it is not absolute, so you can only know the rough by visual inspection, and some experience is required. Capacitors have high electrical requirements, and it is best to use bridges and other instruments for measurement, otherwise they will be broken down and scrapped during use.

Where can I look at the size of the chip capacitors? Many chip capacitors cannot be labeled due to their size limitations. Therefore, it is generally marked on the entire plate during the patch production. If it is a single chip capacitor, its capacity can be measured with a capacitance tester.

Multimeter measuring size:

1. Connect the black test lead to COM, and the red lead to the uppermost right side;

2, connect the gear position to the gear position of the measured capacitance;

3. Connect the test leads of the multimeter to both ends to test it;

To learn to identify the chip capacitors, it is necessary to identify the numerical labeling methods on the chip capacitors. There are usually three types:

1. A letter and a number labeling method, print a black letter and a black number on the white substrate or print a white letter and a white number on the black substrate of the chip-shaped tantalum electrolytic capacitor as a code, where The letters indicate the first two digits of the capacitance. The number at the back means adding a few '0's to the front number.

2. The marking method of one letter and one color, the combination of one color and one letter is printed on the substrate of the chip capacitor as a code to indicate the capacitance. The meaning of the letters is the same as the labeling method, and the color also means adding a few ‘0’s after the number represented by the previous letter.

3. Color circle marking method, which is a method usually used for cylindrical chip capacitors. Among them, the first two rings represent the first two significant digits of the capacitance, the third ring represents adding a few '0's after the first two significant digits, the fourth ring represents the error value, and the fifth ring represents the temperature coefficient of the capacitor.

Recognition of chip capacitors

SMD capacitor identification can be based on these two indicators: 1, size (f); 2, withstand voltage (V). Mathematical notation: The standard value is 104, and the capacity is: 10X10000pf=0.1uf. If the standard value is 473, it is 47X1000pf=0.047uf. (The 4 and 3 in the back both represent the power of 10). Another example: 332=33X100pf=3300pf. One type of capacitor withstand voltage label is a combination of a number and a letter. The number represents the power of 10 exponent, the letter represents the value, the unit is V (volt).

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