SMT Component Letter Codes
2024/06/20
During the SMT assembly process, we will come into contact with a variety of materials. Although the error of materials is a low-level error, it is not easy to identify because there are too many and too complicated materials involved, and the current development trend of materials is getting smaller and smaller. At the same time, PCB boards are getting smaller and smaller, and the distance between materials is compressed smaller, and sometimes there is even no place to print silk screen. If you are not careful, there will be omissions, so such problems are still common in actual operations.
Since Ucreate PCB company took over the SMT patch business, the mounting quality of materials has been the top priority of quality inspection. In addition to conventional inspection methods such as AOI and manual visual inspection, Ucreate engineers will also sort out the polarity of materials for each project and check them one by one with the finished products to prevent errors and omissions.
How to quickly identify the electronic materials in a PCBA board? Which ones are polarized? You can get a glimpse of it through the code silk screen on the PCB board. Basically, each major category of components has its own code, and there are a few overlaps, which should be combined with physical analysis. The following are the corresponding codes for materials.
U- chip
R- resistor
VR- adjustable resistor
RT- thermistor
C- capacitor
D- diode
ZD- voltage regulator
Q- transistor or field effect tube
LED- light emitting diode
BAT- Schottky diode
L- inductor
F- fuse
FB- magnetic bead
T- transformer
K- relay
LS- buzzer
J- plug-in
GND- common ground
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