Smd Components Identification Pdf
With these components. SMD Safety Precautions Surface-mount components are very small, and therefore special precau tions (in addition to those required when working with through-hole components) must be taken. Do not eat or drink when working with surface-mount components. Do not use cups, plates, or any food. SMD-codes for semiconductor components in SOT-89 cases SMD-codes for semiconductor components in SOT-223 cases. The package style is another problem for the identification of SMD devices. The different manufacturers can designate identical cases according to the various standards (or according to the internal firm system).
Contents.Identifying resistors Most axial resistors use a pattern of colored stripes to indicate resistance. SMT ones follow a numerical pattern. Cases are usually brown, blue, or green, though other colors are occasionally found like dark red or dark gray. ( Do the case colors mean something?
If so, let's indicate it.) 4-band axial resistors 4 band identification is the most commonly used color coding scheme on all resistors. It consists of four colored bands that are painted around the body of the resistor. The scheme is simple: The first two numbers are the first two significant digits of the resistance value, the third is a multiplier, and the fourth is the tolerance of the value. Each color corresponds to a certain number, shown in the chart below. The tolerance for a 4-band resistor will be 2%, 5%, or 10%Color1st band2nd band3rd bandMultiplierToleranceTemp. CoefficientBlack000×10 0Brown111×10 1±1% (F)100 ppmRed222×10 2±2% (G)50 ppmOrange333×10 315 ppmYellow444×10 425 ppmGreen555×10 5±0.5% (D)Blue666×10 6±0.25% (C)Violet777×10 7±0.1% (B)Gray888×10 8±0.05% (A)White999×10 9Gold×0.1 (10 −1)±5% (J)Silver×0.01 (10 −2)±10% (K)None±20% (M)For example, if you are looking for a 12K (12000 ohm) resistor with ±5% tolerance, you would be looking for a Brown (1) Red (2) Orange (×10 3) Gold (±5%) resistor.12×10 3 ohm = 12000 Ω = 12 kΩNote that red to violet are the colors of the rainbow where red is low energy and violet is higher energy.
Resistors use specific values, which are determined by their tolerance. These values repeat for every exponent, 6.8, 68, 680. This is useful because the digits, and hence the first two or three stripes, will always be similar patterns of colors, which you will learn to recognize without checking a chart. To help you remember them, the standard values for 10% resistors are:68825-band axial resistors 5-band identification is used for higher tolerance resistors (1%, 0.5%, 0.25%, 0.1%), to notate the extra digit.
The first three bands represent the significant digits, the fourth is the multiplier, and the fifth is the tolerance.SMD/SMT resistors SMD (surface mounted device) or SMT (surface mount technology; same thing) resistors are found mostly on devices where large scale integration is present. They generally use an alphanumeric numbering system.For surface mount resistors, a numerical code is used.
For 10% tolerance resistors, 3 numbers are used, for 1% resistors, 4 digits are used. The scheme is similar to color codes, in that the first two or three digits are the significant digits, and the last digit is the multiplier (expressed as an exponent of 10). This is easy to remember as 'the first digits then as many zeros as the last digit after it' ohms. '683' for instance, represents 68 with three zeros after it: 68 000 = 68 kΩ. Likewise, '4991' represents 499 with 1 zero after it: 499 0 = 4.99 kΩ.For small resistance values, an alternate notation is often used. For these, an R is used in place of the decimal.
For example, 5R6 = 5.6 Ω.They are small.Large resistors For large power resistors and potentiometers, the value is usually written out implicitly as '10 kΩ', for instance.Examples In the top example, the colors are. This means 1 0 ×10 3 Ω ± 5% = 10 ± 0.5 kΩ. This resistor has a value anywhere from 9.5 to 10.5 kΩThe second example has 5 stripes.
This means 1 0 0 ×10 2 Ω ± 1% = 10 ± 0.1 kΩ. This resistor then has a value anywhere from 9.9 to 10.1 kΩ.Note that these are both 10 kΩ.The third example is a larger power resistor, and is labeled. This means 5 6 ×10 0 Ω ± 5% = 56 ± 2.8 Ω. This resistor then has a value anywhere from 53.2 to 58.8 Ω.
It has a higher power rating than the others, which is not labeled, but is obvious from its larger size.Capacitors. Axial (top) and radial (bottom) electrolytic capacitors Electrolytic capacitors Axial electrolytic capacitors are electrolytic capacitors that have connections on both ends. These are most frequently used in devices where there is no space for vertically mounted capacitors. See photograph above.The arrowed stripe indicates the polarity, with the arrows pointing towards the negative pin. Warning: connecting electrolytic capacitors in reverse polarity can easily damage or destroy the capacitor. Most large electrolytic capacitors have the voltage, capacitance, temperature ratings, and company name written on them without having any special color coding schemes.
Most electrolytic capacitors in general have light blue, black, dark purple or brown colors, although some specialized ones come in yellow and other colors. If for some reason you are uncertain about the polarity, the can is always the negative connection.
Most axial caps have both ends visible. The positive end has a rubber insulation and the negative side is only aluminium.Radial electrolytic capacitors are like axial electrolytic ones, except both pins come out the same end. Usually that end (the 'bottom end') is mounted flat against the PCB and the capacitor rises perpendicular to the PCB it is mounted on. This type of capacitor probably accounts for at least 70% of capacitors in consumer electronics (that don't use SMT components). See photograph above.Like their axial counterparts, many radial electrolytic capacitors have the voltage, capacitance, temperature ratings, polarity, and company name directly written on them without having any special color coding schemes.
Tantalum capacitors Tantalum capacitors are useful due to their low leakage current, reliability, and their ability to keep stable capacitance over a wide range of temperatures. Below is a diagram:They have special markings. The stripe on the side indicates polarity. Usually with a store bought component, the longer lead is positive. Warning: connecting tantalum capacitors in reverse polarity can easily damage or destroy the capacitor. Generally it will have the capacitance written in µF, and the working voltage below it.
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In some cases (often when µF is not printed), the value (in pF) is encoded with three numbers; the first two digits being the significant figures, with the third being the multiplier (i.e. Number of zeros).
Smd Components Identification Pdf File
Tantalum capacitors are most commonly dipped and have a shiny coating, as well as vary in color, being yellow, red, and sometimes blue. Most axial tantalum capacitors look completely different.The dark line on the SMT variety is the positive terminal. The dipped axial through-hole variety will be marked with a + or a dark line to indicate the positive terminal.Ceramic capacitors Ceramic capacitors are generally non-polarized and almost as common as radial electrolytic capacitors.Generally, they use an alphanumeric marking system. The number part is the same as for SMT resistors, except that the value represented is in pF. They may also be written out directly, for instance, 2n2 = 2.2 nF.
AdvertisementIn our previous article, we talked about the necessary. If you are a new user, you should buy and use them for using on. Normally We Use Those Through-Hole Components For DIY Electronics. We explained in other article around how to and also listed the. In case you order to get multilayer (you can use single layer PCB too) PCB, you can use the components used for surface mount technology. SMD takes lesser space. Here is a List of SMD Basic Electronic Components.
Modern technology today is made with SMD components. You can solder a circuit with SMD components by baking it in an reflow oven or may be able to solder some components.List of SMD Basic Electronic ComponentsSMT stands for Surface Mount Technology and SMD for Surface Mount Device. Technically, we should not say SMD Basic Electronic Components. However, SMD is used name by the technicians and sold with such name.
SMD Basic Electronic Components which are so called passive rectangular components – resistors, capacitors follow sizes of SMD components conform to the industry standards. Many of the sizes of SMD components follow JEDEC specifications. Standards enable PCB design to become simplified. Different SMT packages can be categorised by the type of components. Standard components such as resistors, capacitors come in sizes that are mentioned with numbers like 1206 or 0805. Advertisement-As first time user for soldering the components, 1206 packages are fairly easy to solder.
The size 1206 translates to the dimension of 3.0 x 1.5 in mm or 0.12 x 0.06 in inches. The size 0201 translates to the dimension of 0.6 x 0.3 in mm or 0.02 x 0.01 in inches.So from the above, we knew about SMD capacitors and SMD resistors, we will buy 1206 SMD resistors. You can perform web search with 1206 SMD resistor to get an idea about price. 1206 SMD capacitor is multilayer ceramic SMD capacitor, more superior is Tantalum SMD capacitors with sizes A to E. Size A closest to the dimension of 1206. You can perform search with SMD capacitor to get a practical idea about price. SMD resistors, SMD capacitors also sold as kit with mixed values – which are practical to buy.Next important components are SMD transistors, SMD diodes, SMD LED.
These components usually housed in a small plastic package and connections are made via leads from the package. Articles Related to List of SMD Basic Electronic Components.Here is a Guide For Getting Started With DIY Electronics With Low Budget. We Discussed About the Components Needed For Electronics DIY Works.Shopping is Not Easy than it Sounds. They Have Scientific Standards. Here is Mini Bulb & Mini Bulb Holder Buying Guide for DIY Electronics.What is the Difference Between Real Time OS (RTOS) and Embedded Linux? How to know which one will be effective, optimum for which purpose?.Circuit Diagram To Create Arduino Traffic Light With LED Display Timer With Push Button Switch. This logical system used for many things.We Have Discussed Some Details On Methods and Components To Build Electronic Circuits Which Are Needed To Create Ammeter Electronic Projects.Additionally, can help you.
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