What is SMT?(七) -- Reflow soldering common knowledge Ⅱ
author: Hellen
2022-09-20
32. The silkscreen on the BGA body contains information such as manufacturer, manufacturer's part number, specification and Datecode/(Lot No);
33. The pitch of 208pin QFP is 0.5mm;
34. among the seven QC techniques, the fishbone diagram emphasizes the search for cause-and-effect relationships;
35. CPK refers to the process capability under actual conditions;
36. the flux starts to evaporate in the constant temperature zone for chemical cleaning action;
37. the ideal cooling zone curve and reflow zone curve mirror relationship;
38. Sn62Pb36Ag2 solder paste is mainly used for ceramic plates;
39. rosin-based fluxes can be divided into four types: R, RA, RSA, RMA;
40. RSS curve for temperature rise → constant temperature → reflow → cooling curve;
41. we are using the PCB material is FR-4;
42. the PCB warpage specification does not exceed 0.7% of its diagonal;
43. STENCIL production laser cutting is a method that can be reworked;
44. The BGA ball diameter commonly used on computer motherboards is 0.76mm;
45. ABS system is absolute coordinate;
46. Ceramic chip capacitor ECA-0105Y-K31 error is ±10%;
33. The pitch of 208pin QFP is 0.5mm;
34. among the seven QC techniques, the fishbone diagram emphasizes the search for cause-and-effect relationships;
35. CPK refers to the process capability under actual conditions;
36. the flux starts to evaporate in the constant temperature zone for chemical cleaning action;
37. the ideal cooling zone curve and reflow zone curve mirror relationship;
38. Sn62Pb36Ag2 solder paste is mainly used for ceramic plates;
39. rosin-based fluxes can be divided into four types: R, RA, RSA, RMA;
40. RSS curve for temperature rise → constant temperature → reflow → cooling curve;
41. we are using the PCB material is FR-4;
42. the PCB warpage specification does not exceed 0.7% of its diagonal;
43. STENCIL production laser cutting is a method that can be reworked;
44. The BGA ball diameter commonly used on computer motherboards is 0.76mm;
45. ABS system is absolute coordinate;
46. Ceramic chip capacitor ECA-0105Y-K31 error is ±10%;
What is SMT?(八) -- Reflow soldering common knowledge Ⅲ
What is SMT?(六) -- Reflow soldering common knowledge Ⅰ
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