SMT patch, Surface Mount Technology
During the SMT placement process, the chip components have adhered to the PCB through solder paste (Solder Paste), and then hot-melt welding is performed by equipment such as hot air or a reflow oven to fix the components on the printing circuit board.
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1. It is usually combined with the length and width of the patch component, a representation of the volume of the patch component, usually in inches (Inch) (1Inch=25.4 mm)
2: The specifications of commonly used patch components are as follows:
A: 0402 means the component: length 0.04Inch width 0.02Inch
B: 0603 means the component: length 0.06Inch width 0.3Inch
C: 0805 means the component: length 0.08Inch width 0.05Inch
D:1206 means the component: length 0.12Inch width 0.06Inch
3. In PCBA Manufacturing, common patch components, and their specifications:
● SMD SMT Resistor Capacitor (Chip resistors Resistors)
Size: Common sizes include 0402, 0603, 0805, 1206, etc. The numbers indicating the size represent the length and width of the size in millimeters.
Resistance range: usually from a few ohms to several megaohms, depending on the type of resistor.
Accuracy: Common accuracies include ±1%, ±5%, etc.
● Chip capacitors (Capacitors):
SizeCommon sizes include 0402, 0603, 0805, 1206, etc. The numbers indicating the size represent the length and width of the size in millimeters
Capacitance Range: Typically from a few picofarads to hundreds of microfarads, depending on the type of capacitor.
Voltage Rating: Common voltage ratings include 6.3V, 16V, 25V, 50V, etc.
● SMD diodes (Diodes):
Size: Common sizes include 0402, 0603, 0805, 1206, etc. The numbers indicating the size represent the length and width of the size in millimeters.
Current Rating: Common current ratings range from a few milliamps to a few amps, depending on the type of diode.
Voltage Rating: Common voltage ratings include 50V, 100V, 200V, etc.
● SMD transistors (Transistors):
Size: Common sizes include 0402, 0603, 0805, SOT-23, etc. SOT-23 is a common SMD transistor package type.
Current Rating: Common current ratings range from a few milliamps to a few amps, depending on the type of transistor.
Voltage Rating: Common voltage ratings include 20V, 30V, 60V, etc.
1. Specification identification:SMT components are usually marked with relevant specification information on their appearance. Information includes component type, value (such as resistance value, capacitance value), accuracy, etc.
2. Datasheets: Specifications for surface mount components can usually be found in datasheets or spec sheets. Relevant data sheets can be found and downloaded through the official website of the component manufacturer, the website of an electronic component distributor, or other electronic component databases. In the datasheet, you can find detailed specifications such as dimensions, electrical characteristics, and packaging types of components.
3. Dimensional measurement: Use tools such as micrometers or microscopes to measure the dimensional parameters of SMT components. For example, measuring the length, width and thickness of chip resistors, or the length, width and height of chip capacitors.
4. Component identification tools: use special component identification tools and equipment to identify the specifications of SMT components. These tools usually use optical or image processing technology to automatically identify the specification information of components by taking images of components and performing image processing and pattern recognition.
● 1. The codes and specifications on the tray of SMT materials must correspond to the codes and specifications on the customer list
Check whether the characteristics and dimensions of components are in accordance with the specifications required by customers. For example, the size, shape, number of pins, etc. of the SMD components should match the components on the PCBA required by the customer. In addition, the appearance of components should be free from damage, deformation or contamination.
● 2: The model of SMT must correspond to the model requirements on the customer list
Components are usually marked with information such as the manufacturer's identifier, model number, batch number, date code, etc. These identifiers should match the information provided by the component data sheet or manufacturer. Ensuring that these identifiers are consistent with required specifications and performance allows verification of correct component material.
● 3. The error of SMT materials should meet the requirements on the customer list
Use a multimeter, oscilloscope or specific test equipment to measure the resistance, capacitance, voltage, current and other parameters of components and compare them with the specification requirements. If there is an error in the specifications of the components, the error of the components in the pcba manufacturing should be communicated with the customer to ensure that the components meet the specifications when they are soldered to the pcb board.
● 4: The silk screen on the SMT physical object is consistent with the requirements on the customer list, if not, there must be valid document support from the customer
For certain types of components that require silkscreen on the component, X-ray diffraction (XRD) or other material analysis techniques can be used to verify the material composition and structure of the component. If the silk screen and the document requirements provided by the customer are inconsistent, communicate with the customer in time to ensure the selection of components and the correct silk screen.
●5: There are special requirements to see the manufacturer's material, and the SMT manufacturer must meet the customer's requirements
Confirming the source and supply chain of components is also an important aspect to judge the correctness of SMT. Ensuring components are sourced from reliable manufacturers, legally sourced, and traceable can help reduce the risk of using low-quality or counterfeit materials.
