6. Integrated Circuit
6.1 SOIC type packaging has polarity. Polarity marks :1) ribbon, 2) symbol, 3) notches and grooves, 4) bevel
6.2 THE PACKAGE of SOP or QFP type has polarity. Polarity labeled :1) notch/groove labeled, 2) One point is different (size/shape) from the other two/three points.
6.3 QFN type encapsulation has polarity. Polarity indicated :1) one point is different from the other two points (size/shape), 2) hypotenuse indicated, 3) symbol indicated (bar/” + “sign/dot).
7. Ball Grid Array
7.1 Part polarity: notch/groove/dot/circle; Polarity of PCB board: circle/dot/letter “1 or A”/bevel mark. The polarity point of the part corresponds to the polarity point on the PCB. SMT resistance identification method
Generally, there are 12 colors of color ring resistors: brown, red, orange, yellow, green, blue, purple, gray, white, black, gold and silver. Among them, the first ten colors represent 1~9(black represents 0), and gold and silver respectively represent two kinds of errors (plus or minus 5% and plus or minus 10%).
The first two colors represent pure Numbers. For example, orange and black represent the number 30(not saying the resistance is 30 euros), and the third color ring represents the number of zeros. For example, if the third color ring is red, it means the number 30 is followed by two zeros, and the resistance value of this resistance is 30 00 euros (3k euros).
The last color ring is either gold or silver. For example, if the last color ring is silver, the resistance of the resistance will be between 3000 ohms plus or minus 10% (the true resistance of the resistance will be any definite value within this range).
SMT capacitance polarity judgment and capacity identification
Capacitor is mainly divided into electrolytic capacitor and wafer capacitor. The shape of electrolytic capacitor is a cylinder, and its cylinder surface is marked with its capacitance size, and it has polarity (the long foot is the positive pole, the short foot is the negative pole).
On the other hand, wafer capacitance has no polarity. It is generally shaped like a circle and marked with three Numbers, among which the first and second digits represent the capacitance value and the third digit represents the number of zeros, such as 233, which represents the capacitance value of 23000PF or 0.023 micromethod.
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Post time: Nov-06-2020