Incoming inspection standards for various electronic components (very detailed here)

Date：2022-01-17 13:31:00Views：2730

The key work of electronic product development is the design of principle realization, component (material) selection, verification and testing, etc. Incoming inspection of components is a very important part and the source of quality management. As the saying goes, "everything is difficult at the beginning". Therefore, only by controlling the source, the subsequent production will be relatively easy. Select appropriate suppliers according to the function and processing technology of product parts to ensure the quality of parts and save costs.

Inspection basis: mil-std-105e-ii; Ma: 0.65; MI: 1.5 Quality requirements b. Serious oxidation and fracture are not allowed at the pin end c. Slight oxidation of pins does not affect their welding b. The outer package shall be marked with obvious items and shall be consistent with the real object c. SMD parts shall be arranged in the same direction d. A few interruptions are not allowed for palletized materials b. The silk screen is slightly blurred, but its specification can still be identified c. The pins shall be free from serious oxidation and fracture d. The slight oxidation of the plug-in capacitor pin does not directly affect its welding e. The capacitor body shall be free of damage, deformation, electrolytic capacitor medium overflow, electrolytic liquid leakage and other phenomena b. The outer package shall be marked with obvious items and shall be consistent with the real object c. The SMT parts shall be arranged in the same direction without interruption or minority (disc assembly) b. After ultrasonic cleaning, the silk screen printing is slightly blurred, but its specification can still be identified c. After ultrasonic cleaning, the rubber (electrolysis) shall not be loose or damaged b. The pins shall be free of oxidation, rust and oil stain c. The pipe body shall be free of defects, cracks and deformation b. The outer package shall be marked with obvious items and shall be consistent with the real object c. It is not allowed to have a few interruptions when loading disks and belts d. The direction of SMT parts must be consistent and correct b. The rectifier and voltage stabilizing value (power on state) shall be consistent with the nominal value measured by voltage gear b. After ultrasonic cleaning, the silk screen printing is slightly blurred, but its specification can still be identified b. The pipe body shall be free of defects, scratches, deformation and burrs c. The welding end shall be free of oxidation, oil stain, etc d. The polarity of the tube must be clearly distinguished and easy to distinguish b. No errors are allowed in packaging materials and marks c. The arrangement direction of SMT parts must be consistent and correct d. A few interruptions are not allowed for disc loading b. Use 2-5vdc power supply to detect its luminous color and luminosity, which must be uniform and consistent b. The welded end of the pipe body shall be free of oxidation, rust and fracture; The mounting parts shall be free of warping and bending feet c. The body shall be free of defects, cracks and deformation b. The installation direction of the wheel must be consistent and correct c. The outer package shall be marked with obvious items and shall be consistent with the real object b. The measured / regulated value shall be consistent with the model characteristics; And comply with the requirements on the corresponding BOM b. After ultrasonic cleaning, the silk screen printing is slightly blurred, but its specification can still be identified b. The body shall be free from defects, cracks and deformation c. IC pins must be evenly spaced and free from serious warping, broken pins and oxidation d. Slight oxidation does not affect welding e. If the warping foot is less than 0.2mm, it will not affect the welding b. The chip must be placed in an anti static disk compartment and sealed b. Conduct computer test on the IC directly inserted with the corresponding product, and the overall function is OK (refer to the test standard) b. After ultrasonic cleaning, the silk screen printing is slightly blurred, but its specification can still be identified b. After ultrasonic cleaning, the silk screen has dropped, so its specification can be identified c. The body shall be free of defects, rust and deformation, and the base and shell shall be welded firmly without gaps d. The pins shall be free from oxidation, fracture and looseness b. The outer package shall be marked with obvious items and shall be consistent with the real object b. Conduct online test with the corresponding product plug-in, and the overall function is OK (refer to the test standard) b. After ultrasonic cleaning, the silk screen printing is slightly blurred, but its specification can still be identified b. The body shall be free of defects and cracks, and the pins shall be free of serious oxidation, fracture and looseness c. Slight oxidation of pins does not affect direct welding B. must be packed in foam box and placed in the same direction. b. Measure the resistance ratio of the primary / secondary coil, which shall be consistent with the model and characteristics c. Plug in with the corresponding model of products for computer internet test (according to the test standard) b. After ultrasonic cleaning, the screen printing of the body is fuzzy, and its specification can still be identified, and the protective film is free of damage and deformity b. The body shall be free of defects, peeling and deformation c. The welding end / pin shall not be seriously oxidized and contaminated with foreign matters that hinder welding d. The welding end is slightly oxidized but does not affect its welding b. SMT parts must be installed with sealing disc and no interruption is allowed b. Weld with the corresponding product for computer test, and the overall function is OK (refer to the test standard) b. The body shall be free from defects and deformation c. The length of scratches on the table body shall not exceed 2mm, the depth shall not exceed 0.1mm, and the overall number shall not exceed 2 d. The screen print on the table body is slightly blurred, but its specification can be identified e. The pins are free of serious oxidation, fracture and looseness f. Slight oxidation of the pin does not affect its welding b. Plug in with the corresponding model products for online test, and the overall function is OK (according to the test standard) b. It must be installed with plastic pipe in the same direction b. The allowable tolerance range of dip part length / width / height / foot distance is + 0.25mm b. The body shall be free of defects, cracks and deformation, and the pin spacing shall be uniform without broken feet, warped feet and serious oxidation c. Slight oxidation of pins does not affect welding b. It must be installed with plastic pipe and placed in the same direction b. After ultrasonic cleaning, the silk screen printing is slightly blurred, but its specification can still be identified b. The pins shall be free of fracture, rust and looseness c. The scratches on the socket body shall not exceed 1cm, and only 2 are allowed on the negative side d. Slight oxidation of pins does not affect welding b. The power board surface is slightly dirty (welding aid) and does not affect the function and assembly b. The outer package shall be marked with obvious items and shall be consistent with the real object b. There is no abnormality in the test after assembly with the corresponding product accessories b. The shell shall be free of rust and deformation c. Whether there is dirt on the surface d. The specifications shall meet the requirements specified in the BOM b. The switching piece shall be free from the phenomenon of unsmooth switching and poor hand feeling b. The rough edge length of the line edge shall not be greater than 1mm, and the missing corner or defect area shall not be greater than 10% of the original line width c. PCB warping greater than 0.5mm (horizontal plane) is not allowed d. The line width shall not be less than 80% of the original line width e. Pad offset and pad damage shall not be greater than 20% of the original pad specification f. There shall be no more than 2 lines with a length of less than 3mm. It is not allowed to repair adjacent lines at the same time. After the repaired lines are baked in tin furnace and high temperature, the lines and anti welding paint shall not peel off or blister g. The pad at the gold finger and chip refuses to repair the circuit h. The non line conductor (residual copper) must be more than 2mm away from the line, the area must be less than 1mm, the length must be less than 2mm, and the electrical performance will not be affected j. The pad part shall be free of foreign matters such as serious oxidation, exposed copper and oil stain that hinder the tin on the pad i. The exposed copper area shall not be greater than 2mm, and copper shall not be exposed between two adjacent lines at the same time l. The scratch length of anti welding paint shall not be greater than 1cm, the scratch length of exposed copper shall not be greater than 5mm, and only one is allowed on one side m. The golden finger must be golden yellow without obvious discoloration or blackening n. Copper and nickel are not allowed to be exposed on the golden finger o. No pinholes, toothed edges or scratches are allowed on the golden finger p. The gold-plated surface shall not be stained with tin, paint or unclean oil stain q. Any substrate substrate is not allowed to have loose lamination, obvious delamination and other phenomena r. No crack or fracture is allowed on any substrate substrate s. Large area fingerprints, water marks and other unclean oil stains are not allowed on the surface of anti welding paint t. It is not allowed for the anti welding paint to fall off due to poor adhesion or bubbles b. The gold or tin plating of the pad shall meet the specification requirements in the letter of acceptance c. Drilling shall be in accordance with the hole diameter specification and allowable tolerance specified in the letter of acceptance d. Important identification characters such as PCB model and version must be marked on the obvious position of the layout by printing or etching e. The text, component part number, symbol and other marks on the part surface shall not be incomplete or illegible b. After cleaning, the plate surface components and solder joints shall not be white c. After cleaning, it is not allowed to have adverse phenomena affecting performance and appearance b. PCB batch incoming materials are not allowed to provide defective products with deviation exceeding 10% c. It is not allowed to provide defective products with more than 25% deviation for each large connecting board of PCB d. The outer package must be marked with model, specification, quantity, production date, etc

No.	Material name	Inspection items	Test method: in the light 1m-1.2m away from the 40W fluorescent lamp, the distance between the eyes and the object is 20-30cm, and the viewing time is about 3-5 seconds
1	resistance	1. Dimensions	a. The allowable tolerance range of length / width / height of SMT parts is+0.2mm
			b. The allowable tolerance range of dip part length / diameter (round body) / foot diameter is+0.25mm
		2. Appearance	a. The body shall be free from damage or serious body contamination
		3. Packing	a. The packing method is bag or plate
		4. Electrical	a. The measured volume value must be consistent with the marked and corresponding product BOM requirements
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the color ring shall not fall off or deviate by 1 / 4 of its original position
2	capacitance	1. Dimensions	a. The allowable tolerance range of length / width / height of SMT parts is+0.2mm
			b. The allowable tolerance range of dip part length / diameter (round body) / foot diameter is+0.25mm
		2. Appearance	a. The model, specification and direction of the body shall be clear and correct
		3. Packing	a. The packing method is bag or plate
		4. Electrical	a. The measured resistance value must be consistent with the mark and the corresponding product BOM requirements
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the silk screen printing shall not be seriously blurred and its specification cannot be identified
3	Diode (rectifier regulator)	1. Dimensions	a. The allowable tolerance range of length / width / height of SMT parts is + 0.2mm
			b. The allowable tolerance range of dip part length / diameter (round body) / foot diameter is+0.25mm
		2. Appearance	a. The model, specification and direction of the body shall be clear and correct
		3. Packing	a. The packaging method is disc, tape or bag
		4. Electrical	a. Use a multimeter to measure its positive and negative polarity, which shall be consistent with the mark, and there shall be no open or short circuit
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the silk screen printing shall not be seriously blurred and its specification cannot be identified
4	light-emitting diode	1. Dimensions	a. The allowable tolerance range of length / width / height of SMT parts is+0.2mm
			b. The allowable tolerance range of dip part length / diameter (round body) / foot diameter is+0.25mm
		2. Appearance	a. The transparency and color of the tube must be uniform and consistent
		3. Packing	a. The packing method is bag or plate
		4. Electrical	a. Measure the polarity corresponding to the length of the foot (generally, the long foot is positive and the short foot is negative)
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the pipe body has no discoloration and outer layer peeling
5	triode	1. Dimensions	a. The three terminal pin spacing must be uniform, and the allowable tolerance shall not exceed 0.2mm
		2. Appearance	a. The printing model shall be free of errors, and the silk screen printing shall be clear and easy to identify
		3. Packing	a. The pasted parts must be installed in disk (no interruption or few are allowed)
		4. Electrical	a. Measure the polarity of the pin and ensure that there is no open circuit or short circuit between the pins
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the silk screen printing shall not be seriously blurred and its specification cannot be identified
6	IC	1. Dimensions	a. The length / width / thickness / foot distance dimension shall not exceed the tolerance range of the drawing
		2. Appearance	a. The surface silk screen printing shall be clear and legible, and the contents and marks shall be clear and correct
		3. Packing	a. The outer package shall be marked with obvious items and shall be consistent with the real object
		4. Electrical	a. The storage and reading function of the copy machine shall be consistent with the model, and it can copy the content or refresh and recopy as OK
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the silk screen shall not be seriously blurred or unrecognizable
7	Crystal oscillator	1. Dimensions	a. The height / foot distance dimension shall not exceed the tolerance range of the drawing
		2. Appearance	a. The screen printing of the table body shall be clear and legible, and the model and direction shall be marked correctly, and it shall not fall after ultrasonic cleaning, so it is unclear and its specification cannot be distinguished
		3. Packing	a. The packaging must be sealed with tape
		4. Electrical	a. Measure that there is no open circuit or open circuit between its pins
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the silk screen does not fall, blurred and indistinguishable
8	Transformer	1. Dimensions	a. The length / width / foot distance dimension shall not exceed the tolerance range of the drawing
		2. Appearance	a. The surface silk screen printing shall be clear and legible, and the model and direction marks shall be clear and correct
		3. Packing	a. The outer package shall be marked with obvious items and shall be consistent with the real object
		4. Electrical	a. The primary / secondary coils shall be free of open circuit or inconsistent resistance (according to the sample)
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the screen printing is free of falling, blur and unrecognizable, and the protective film is free of wrinkling and peeling
9	Inductive magnetic bead	1. Dimensions	a. Allowable tolerance range of length / width / height of SMT parts+0.2mm
			b. The allowable tolerance range of dip part length / diameter (round body) / foot diameter is+0.25mm
		2. Appearance	a. The color ring marking of inductance must be clear and correct
		3. Packing	a. The outer package shall be marked with obvious items and shall be consistent with the real object
		4. Electrical	a. The coil shall be free of open circuit
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. After ultrasonic cleaning, the color ring shall not fall off or deviate by 1 / 4 of its original position
10	relay	1. Dimensions	a. The length / width / height / foot distance dimension shall not exceed the tolerance range of the drawing
		2. Appearance	a. The surface silk screen printing shall be clear and legible, and the model and content shall be clear and correct
		3. Electrical	a. Measure each on / off contact and coil resistance, which must be consistent with the corresponding model
		4. Packing	a. The outer package shall be marked with obvious items and shall be consistent with the real object
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
11	wave filter	1. Dimensions	a. Allowable tolerance range of length / width / height / foot distance of SMT parts + 0.2mm
		2. Appearance	a. The printing screen printing shall be clear and legible, and the content and direction marks shall be correct
		3. Packing	a. The outer package shall be marked with obvious items and shall be consistent with the real object
		4. Electrical	a. Weld with the corresponding product for computer test, and the overall function is OK (refer to the test standard)
		5. Tin dipping	a. The solderability area of pins shall not be less than 75%
		6. Cleaning	a. After ultrasonic cleaning, the silk screen shall not be seriously blurred or unrecognizable
12	USB head socket	1. Dimensions	a. The length / width / foot distance / hole size shall not exceed the tolerance range of the drawing
		2. Appearance	a. The body shall be free of defects, scratches and deformation
		3. Packing	a. The outer package shall be marked with obvious items and shall be consistent with the real object
		4. Electrical	a. Measure the on and off contact of each pin, and the conductivity must be good
		5. Tin dipping	a. Solderability of welding end / pin shall not be less than 90%
		6. Cleaning	a. The body shall be free of corrosion marks and corrosion after cleaning
		7. Trial assembly	a. There is no mismatch with the corresponding accessories
13	Laser module	1. Dimensions	a. The length / width / positioning dimension shall not exceed the tolerance range specified in the structural drawing
		2. Appearance	a. Sr / SC terminals of board power supply must be clearly marked, the board surface must be clean, and the components must be free of damage and deformation
		3. Packing	a. The veneer must be packed in anti-static bags and placed in boxes with paper cushion
		4. Electrical	a. Measuring the power of the laser module must be consistent with the power parameter range of the corresponding product
14	Key switch	1. Appearance	a. The pins shall be free from oxidation, rust, fracture and distortion
		2. Structure	a. The on / off state of the grounding point is consistent with the switch switching
15	PCB	1. Line part	a. Open circuit and short circuit are not allowed in the circuit
		2. Structure size	a. The dimensions and specifications shall be in accordance with the forming dimensions specified in the letter of acceptance, and the clear dimensions, thickness specifications and allowable tolerances shall be marked in the drawing
		3. High temperature test	a. After reflow soldering (180 ° C-250 ° C) of the base plate, the anti welding paint shall be free of blistering, peeling, deformation and discoloration, and the tin plate shall be free of tin marks, tin slag, contamination, etc
		4. Cleaning	a. After cleaning, there shall be no glue joint in the wire printing protective paint on the plate surface
		5. Packing	a. PCB incoming materials must be packed in vacuum (moisture-proof desiccant shall be attached)