IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第49页

T arget Condition - Class 1,2,3 (⽬标条件 - 1,2,3级) • Contacts are free of surface nodules, roughness, electrical test witness marks or scratches that exceed 0.8 µm [32 µin] RMS (root-mean-square) in the pristine area in acc…

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Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
271c
2.7 PRINTED CONTACTS(印制接触⽚)
2.7.1 Surface Plating Plated Contacts (cont.)(表⾯镀层 电镀的接触⽚(续)
40 IPC-A-600H-201020104
Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
Contacts are free of surface nodules, roughness, electrical test
witness marks or scratches that exceed 0.8 µm [32 µin] RMS
(root-mean-square) in the pristine area in accordance with an
applicable test method AABUS. If IPC-TM-650, Method 2.4.15,
is used, it is recommended that the roughness-width cutoff be
adjusted to approximately 80% of the maximum length of the
wire bond pad in order to obtain the RMS value within the pristine
area. For more information on surface roughness, refer to ASME
B46.1.
The pristine area is defined as an area bounded in the center of the
pad by 80% of the pad width and 80% of the pad length (see Fig-
ure 2711b).
供需双方协商确定的测试方法测试,接片在
域内没有0.8µm[32µin]RMS值)的表面
粗糙电气测试 划痕。如使用IPC-TM-650测试方法
2.4.15,为了获得完区域内的值,建议把粗糙
宽度调线最大长度80%。关于表面
粗糙的更多信息参考ASME B46.1
区域的定是以引线为基准,引线
80%宽度80%内的区域(见图2711b
2711a
2711b 完好区域
2.7 PRINTED CONTACTS(印制接触⽚)
2.7.1.1 Surface Plating – Wire Bond Pads(表⾯镀层 ⾦属线键合盘)
41IPC-A-600H-2010 20104
Nonconforming - Class 1,2,3(不符合条件 - 1,2,3级)
Defects either do not meet or exceed above criteria.
缺陷不符合或出上述要求。
2711c
2711d
2711e
2.7 PRINTED CONTACTS(印制接触⽚)
2.7.1.1 Surface Plating Wire Bond Pads (cont.)(表⾯镀层 ⾦属线键合盘(续)
42 IPC-A-600H-201020104