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Package size of various SMT components
SMT processing plants often have some common knowledge reserves about SMT processing. As the person most familiar with SMT processing, SMT processing factory is undoubtedly the one who has the most say. Today we will focus on the package size of SMT components, and I hope it will be helpful to everyone.
The package size of SMT processed chip components, there are 9 common packages of SMT processed chip resistors, which are represented by two size codes. One size code is an EIA (Electronic Industries Association of America) code represented by a 4-digit number. The first two digits and the last two digits indicate the length and width of the resistor, in inches. The 0603 package we often say refers to the inch code. The other is the metric code, which is also represented by 4 digits, and its unit is millimeters. The following table lists the relationship between inch and metric packages of chip resistor packages and detailed dimensions: for example, a 0.127mm (5 mil) thick ladder laser cut electropolishing template is used to meet the solder paste screen printing on the circuit board. Because the release characteristics of solder paste are not yet known, some pad designs include holes in the disk, and their determination depends entirely on conventional template design experiments. As a result, the pores of all 0201 devices are designed to have a ratio of pores to pads of 1:1.
Because there are other components on this PCB circuit board, including CCGA devices, a 0.127mm (5 mil) thick template may be the thinnest template. There is no stepstencil designed to prevent damage to the The solder joints of other components on the board. The length-to-diameter ratio (aspectratios) value from this design is between 2.4 and 3.2. The area aspect ratios range from 0.72 to 0.85. Based on these values, an excellent solder paste release effect can be foreseen.
SMT patch processing machine test steps
What are the procedures for the solicitation and testing of SMT patch processing? Compared with this problem, it is a big problem for many newcomers to the SMT patch processing industry. In the following, Jingbang Technology will analyze the process and various work indicators in the process for you, hoping to help and inspire you.
1. Test of encoder:
Preparations: prepare a modulator, a program source (such as DVD, etc.), a satellite receiver (used to receive modulator signals), a TV set, three video cables, S-video cables, and audio cables, Code sulfur data line (double Q9 line), radio frequency line (L16 to F head) each.
SMT patch processing test steps:
A. Connect various data cables and power cables, turn on, and check the display to see if the display is normal.
B. Operate the keyboard, first call the encoder to the default settings.
C. Check the image effect on the TV to see if the image is normal
D. Use a hair dryer to slowly warm the encoder and observe whether the image is normal.
E. Knock the encoder with your hand and observe whether the image is normal.
F. Repeat the power on and off for many times to see if the encoder is working properly.
G. Interface inspection: replace with a different data interface for inspection.
Note: Please refer to the product operation manual for the specific operation methods involved in the above operation process, and do an inspection corresponding to the functions indicated in the manual.
End of test: In the above inspection process, the image and sound have been smooth and the equipment is qualified.
2. SMT patch processing multiplexer test:
Preparations: prepare a modulator, an encoder, a program source (such as DVD, etc.), a satellite receiver (used to receive modulator signals), a TV set, and two stream data lines, Video cable, audio cable, (double Q9 cable), radio frequency cable (L16 to F head) each.
Test steps:
A. Connect various data cables and power cables, turn on the computer, and check the display to see if the display is normal.
B. To operate the keyboard, first call the default setting of the multiplexer once.
C. Check the image effect on the TV to see if the image is normal.
D. Use a hair dryer to slowly warm up the multiplexer and observe whether the image is normal.
E. Knock the multiplexer with your hand to observe whether the image is normal.
F. Repeat the power on and off for many times to see if the multiplexer works normally.
G. Interface inspection: replace with a different data interface for inspection.
Note: Please refer to the product operation manual for the specific operation methods involved in the above operation process
End of the test: During the above inspection process, the image and sound have been smooth and the equipment is a qualified equipment
3. SMT patch processing modulator test:
Preparations: one spectrum analyzer, one encoder, one program source (such as DVD, etc.), one satellite receiver (used to receive modulator signals), one TV set, stream data cable, video cable, Audio cable, (double Q9 line), RF cable (L16 to F head and double L16) each.
