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Digital high-definition TV chip components (sheet components) of the identification techniques (d)

In Electronic Infomation Category: D | on March 19,2011

(2) directly tagging, note that the main parameters of capacity and MC100LVE111 datasheet and pressure values, such as 10V6 that capacity 10 pF, voltage is 6 V.

(3) use the code, chip electrolytic capacitors are usually used by a letter code and MC100LVE111 price and three numbers, letters voltage electrolytic capacitor value, and MC100LVE111 suppliers and the three digits to indicate the electrolytic capacitor. Capacity units are pF, first two digits represent significant figures, third digit represents the add "0" number. SMD electrolytic capacitor above the bar indicate the end of the cathode. SMD electrolytic capacitor code value in the relationship between letters and the pressure is shown in Table 4.

Table 4 chip electrolytic capacitor code value of the relationship between letters and pressure tables


Example, an electrolytic capacitor of the identification code for the A475, said the pressure value is A 10V, 47 that the effective capacity of the representative figure of 47,5 10 5 , then the electrolytic capacitor is 47 10 5 pF = 4.7 10 6 pF = 4.7 F .

3. Chip Inductor

Inductors in electronic circuits are often used. A wire wound around the core or core, or a hollow coil is an inductor. The main physical characteristics of the inductor is to convert electrical energy into magnetic energy and stored.

Can also say that it is a magnetic energy storage components. Inductance is the principle of electromagnetic induction to work. Chip inductors common form shown in Figure 5.


Figure 5, the shape of common chip inductors Figure

Figure 5 (a) shows the internal skeleton winding, a magnetic shielding by the external plastic molded package structure; Figure 5 (b) shows the winding with a rectangular frame made of (ceramic skeletons or skeleton ferrite skeleton) structure, both ends of the head for welding; Figure 5 (c) as the working-shaped ceramic, aluminum or ferrite frame, welding the bottom part of the skeleton.

Figure 5 (a) the structure of magnetic shielding, and other interactions between the inductor small, high-density mounting; Figure 5 (b) the smallest structure, Figure 5 (c) the maximum structure size.

NH chip inductors and H inductance of the two units, units with nH to do with the N or R said decimal point. For example, 4N7, said 4.7 nH, 4R7 indicates 4.7 H; 10N, said 10 nH, and 10 H is represented by 100.

4. SMD LED

(1) SMD diode model

Part of the patch diode models still use leaded diode type, such as the well-known rectifier diodes 1N4001-lN4007, switch 1N4148 and so on. In addition, the new diode chip has its own model.

Present, large number of imported components, most of the United States, Japanese products, while some European manufacturers (such as SGS company, SIEMENS Company and PHILIPS companies, etc.) produced no device, so that more complex models.

Countries have named the standard model for discrete semiconductor devices, such as the United States beginning 1N, 1S the beginning of the Japanese, the beginning of 2A ~ 2D expressed diodes. There are many names by the manufacturers themselves (factory standard), such as SM4001 ~ SM4007, GS1A ~ GSIK, SIA ~ SIM and M1 ~ M7 and so on. This non-standard models in the circuit, the analysis of the circuit will bring a lot of difficulties and maintenance.

(2) SMD diode package SMD diode

a variety of packages can mainly be divided into three types: two-lead type, cylindrical type (glass or plastic cover) and small plastic type. Second, the top surface of lead type and the circumference of cylindrical bar with a sign on the line, that the extreme negative diode. Common shape of the diode chip shown in Figure 6.


Figure 6 SMD diode common outline drawings

(Continued)

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