Naming rules and methods for SMT surface mount capacitors

Naming of Surface mount Capacitors: The naming of surface mount capacitors includes parameters such as the size of the capacitor, the material used to make it, the required accuracy, the required voltage, the required capacity, the requirements for the terminals, and the packaging requirements. The parameters required for ordering surface mount capacitors generally include size, required accuracy, voltage requirements, capacity value, and required brand. Example: 0805CG102J500NT0805: Refers to the small size of the chip capacitor, expressed in inches. 08 represents a length of 0.08 inches, and 05 represents a width of 0.05 inches. CG: Refers to the material required for making this capacitor, which is generally suitable for making capacitors with less than 10000PF. 102: Refers to the capacitor capacity, with the first two digits being significant numbers and the last two digits representing how many zeros there are. 102=10 × 102, which is equal to 1000PFJ: Refers to the required capacitance value with an error accuracy of 5%. The dielectric material and error accuracy are paired. 500: Refers to the required withstand voltage of 50V for the capacitor. Similarly, 500: The first two digits are significant numbers, and the last two digits refer to how many zeros there are. N: It refers to the material of the terminal. Nowadays, the general terminal refers to three layers of electrodes (silver/copper layer), nickel, and tin. T: refers to the packaging method, where T represents tape packaging, and B represents the color of plastic box packaging for surface mount capacitors. The commonly seen colors are lighter yellow and bluish gray than cardboard boxes, which may cause different differences in the specific production process. Surface mount capacitors do not have printing on them, which is related to their manufacturing process (surface mount capacitors are made by high-temperature sintering, so it is not possible to print on their surface), while surface mount resistors are made by screen printing (marking can be printed). Surface mount capacitors include ordinary surface mount capacitors with medium to high voltage, with a series voltage of 6.3 V ,10V ,16V ,25V ,50V ,100V ,200V ,500V ,1000V , 2000V ,3000V , 4000V There are two ways to represent the size of surface mount capacitors, one is in inches and the other is in millimeters. The models of the surface mount capacitor series include 0201, 0402, 0603, 0805, 1206, 1210, 1812, 2010, 22, 25, etc. The materials for surface mount capacitors are commonly divided into three types: NPO, X7R, and Y5V. NPO has stable electrical properties and hardly changes with temperature, voltage, and time. It is suitable for high-frequency circuits with low loss and stability requirements. The capacity accuracy is around 5%, but this material can only be used for smaller capacities. For conventional capacities below 100PF, 100PF-1000PF can also be produced but at a higher price. X7R is less stable than NPO, but its capacity is higher, with a capacity accuracy of around 10%. The stability of Y5V dielectric capacitors is poor, with a capacity deviation of about 20%, and they are sensitive to temperature and voltage. However, this material can achieve high capacity at a lower price and is suitable for circuits with little temperature change. There are several types of packaging for surface mount capacitors: they can be divided into two categories: non-polar and polar. The following two types of packaging are common for non-polar capacitors: 0805 and 0603; Polarized capacitors, also known as electrolytic capacitors, are commonly used as aluminum electrolytic capacitors. Due to their electrolyte being aluminum, their temperature stability and accuracy are not very high. As surface mount components are closely attached to the circuit board, high temperature stability is required. Therefore, tantalum capacitors are more commonly used as surface mount capacitors. According to their voltage resistance, surface mount capacitors can be divided into four series: A, B, C, and D. The specific classification is as follows: Type Package Form Voltage Resistance A 3216 10V B 3528 16V C 6032 25V D 7343 35V There are two ways to represent the size of surface mount capacitors, one is in inches and the other is in millimeters. The series models of surface mount capacitors include 0402, 0603, 0805, 1206, 1812, 2010, 2225, and 2512, which are in inches. 04 represents a length of 0.04 inches, 02 represents a width of 0.02 inches, and other similar model sizes (in millimeters) are in English, metric, length and tolerance, width and tolerance, thickness and tolerance. 0402 1005 1.00 ± 0.05 0.50 ± 0.05 0.50 ± 0.05, 0603 1608 1.60 ± 0.10 0.80 ± 0.10 0.80 ± 0.10085, 2012 2.00 ± 0.20 1.25 ± 0.20 0.70 ± 0.20 1.00 ± 0.20 1.25 ± 0.201206 3210 6 3.20 ± 0.30 1.60 ± 0.20 0.70 ± 0.20 1.00 ± 0.20 1.25 ± 0.201210 3225 3.20 ± 0.30 2.50 ± 0.30 1.25 ± 0.30 1.50 ± 0.301808 4520 4.50 ± 0.40 2.00 ± 0.20 ≤ 2 00 1812 4532 4.50 ± 0.40 3.20 ± 0.30 ≤ 2.502225 5763 5.70 ± 0.50 6.30 ± 0.50 ≤ 2.503035 7690 7.60 ± 0.50 9.00 ± 0.05 ≤ 3.00 Surface mount capacitor Overview: Full name: Multilayer (layered, stacked) chip ceramic capacitor, also known as surface mount capacitor or chip capacitor, abbreviated as MLCC in English. The colors of surface mount capacitors are commonly seen as lighter yellow and bluish gray than cardboard boxes, which can vary in the specific production process. The common color for COG material is yellow, while for X7R material, gray is the main color. The main specifications and dimensions are divided into 0201, 0402, 0603, 0805, 1206 according to imperial standards; And large specifications such as 1210, 1808, 1812, 2220, 2225, 3012, 3035, etc. Capacity range: 0.5pF~100uF, among which, it is generally considered that a capacity above 1uF is a large capacity capacitor. Rated voltage: From 4V to 4KV (DC), when the rated voltage is 100V or above, it is classified as medium high voltage products. The stability and capacitance accuracy of chip capacitors correspond to the dielectric materials used, mainly divided into three categories: first, high-frequency capacitors with COG/NPO as Class I dielectric, with a temperature coefficient of ± 30ppm/℃, and very stable capacitance that hardly changes with temperature, voltage, and time. They are mainly used in high-frequency electronic circuits, such as oscillation and timing circuits; Its capacity accuracy is mainly ± 5, and when the capacity is below 10pF, three types of accuracy can be selected: B level (± 0.1pF), C level (± 0.25pF), and D level (± 0.5pF). 2, It is an intermediate frequency capacitor with X7R as the Class II medium, with a temperature coefficient of ± 15 and relatively stable capacitance. It is suitable for various bypass, coupling, filtering circuits, etc. Its capacitance accuracy is mainly in the K range (± 10). In special circumstances, products with J-level (± 5) accuracy can be provided. 3, It is a low-frequency capacitor with Y5V as the Class II dielectric, with a temperature coefficient of+30~-80. The capacitance varies greatly with temperature, voltage, and time, and is generally only suitable for various filtering circuits. Its capacity accuracy is mainly in Z-range (+80~-20), and products with ± 20 accuracy can also be selected. When selecting a chip capacitor correctly, in addition to providing its specifications and capacity, special attention must be paid to the circuit's requirements for the temperature coefficient, rated voltage, and other parameters of the chip capacitor. Standard naming method and definition for surface mount capacitors: The naming of surface mount capacitors differs between domestic and foreign manufacturers, but includes the same parameters. The naming of surface mount capacitors includes the following parameters: 1. Dimensions of surface mount capacitors (0201, 0402, 0603, 0805, 1206, 1210, 1808, 1812, 2220, 2225) 2. Materials of surface mount capacitors (COG, X7R, Y5V, Z5U, RH, SH) 3. Required accuracy (± 0.1PF, ± 0.25PF, ± 0.5PF, 5, 10%, 20%) 4. Voltage (4V, 6.3V, 10V, 16V, 25V, 50V, 100V, 250V, 500V, 1000V, 2000V, 3000V) 5. Capacity 0PF-47UF6. Terminal requirements N represents three layers Electrode 7, packaging requirements T represents tape packaging, P represents loose packaging Example: 0805CG102J500NT0805: refers to the size of the surface mount capacitor, which is expressed in inches 08 represents the length of 0.08 inches (converted to mm=0.08 * 24.50=1.96mm), 05 represents the width of 0.05 inches converted to Mm=0.05 * 24.50=1.225ccmCG: represents the material required for producing capacitors, 102: refers to the capacitor capacity, the first two digits are significant numbers, and the last 2 represents how many zeros there are. 102=10 × 102, which is=1000PFJ: requires the capacitor's capacity value to achieve an error accuracy of 5%, and the dielectric material and error accuracy are paired. 500: requires the capacitor to withstand a withstand voltage of 50V. Similarly, 500: the first two digits are significant numbers, and the last 2 represents how many zeros there are. N: It refers to the material of the terminal. Nowadays, the general terminal refers to a three-layer electrode (silver/copper layer), nickel, and tin. T: refers to the packaging method, where T represents braided packaging and B represents plastic box loose packaging. Surface mount capacitors currently use different material specifications such as NPO, X7R, Z5U, Y5V, etc. Different specifications have different uses. Below, we will only introduce the performance and applications of commonly used NPO, X7R, Z5U, and Y5V, as well as the ordering items that should be noted in procurement to attract everyone's attention. Different companies may have different naming methods for capacitors with different performance mentioned above. Here, we refer to the naming method of our company, Sanju Electronics. For products from other companies, please refer to their product manuals. The main difference between NPO, X7R, Z5U, and Y5V is their different filling media. Under the same volume, capacitors composed of different filling media have different capacities, resulting in different dielectric losses and capacity stability of the capacitors. So when using capacitors, different capacitors should be selected according to their different functions in the circuit. NPO capacitor is a commonly used single-chip ceramic capacitor with temperature compensation characteristics. Its filling medium is composed of rubidium, samarium, and some other rare oxides. NPO capacitors are one of the capacitors with stable capacitance and dielectric loss. When the temperature ranges from -55 ℃ to+125 ℃, the capacitance changes by 0 ± 30ppm/℃, and the variation of capacitance with frequency is less than ± 0.3 Δ C. The drift or hysteresis of NPO capacitors is less than ± 0.05%, which is negligible compared to thin film capacitors with a drift or hysteresis greater than ± 2%. The typical variation in capacity relative to service life is less than ± 0.1%. The capacitance and dielectric loss of NPO capacitors vary with frequency depending on the packaging form, and larger packaging sizes have better frequency characteristics than smaller packaging sizes. NPO capacitors are suitable for slot capacitors in oscillators and resonators, as well as coupling capacitors in high-frequency circuits. The X7R capacitor is known as a temperature stable ceramic capacitor. When the temperature is between -55 ℃ and+125 ℃, the capacity change of the capacitor is 15%. It should be noted that the capacity change of the capacitor is nonlinear at this time. The capacity of X7R capacitors varies under different voltage and frequency conditions, and it also changes over time, with a variation of approximately 1% Δ C every 10 years, resulting in a variation of approximately 5% over 10 years. X7R capacitors are mainly used in industrial applications with low requirements, and their capacity changes under acceptable conditions when the voltage changes. Its main feature is that it can achieve a relatively large electrical capacity within the same volume. The three Z5U capacitors are called "universal" ceramic monolithic capacitors. The first thing to consider here is the temperature range of use. For Z5U capacitors, the main factors are their small size and low cost. For the three types of ceramic monolithic capacitors mentioned above, Z5U capacitors have the largest capacitance at the same volume. But its capacitance is greatly affected by the environment and working conditions, and its aging rate can decrease by up to 5% every 10 years. Despite its unstable capacity, it has a wide range of applications due to its small size, low equivalent series inductance (ESL) and equivalent series resistance (ESR), and good frequency response. Especially in the application of decoupling circuits. The other technical specifications of Z5U capacitor are as follows: operating temperature range+10 ℃ -+85 ℃ temperature characteristics+22% - --56% dielectric loss * 4%. Y5V capacitor is a universal capacitor with certain temperature limitations, and its capacity change can reach+22% to -82% in the range of -30 ℃ to 85 ℃. The high dielectric constant of Y5V allows for the fabrication of capacitors up to 4.7 μ F in smaller physical dimensions. The other technical specifications of Y5V capacitors are as follows: operating temperature range -30 ℃ -+85 ℃ temperature characteristics+22% - --82% dielectric loss * 5% larger. The main characteristic parameters of the capacitor are: