IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第48页

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 超 出上述要求。 图 271c 2.7 PRINTED CONT ACTS (印制接触⽚) 2.7.1 Surface Plating – Plated Contacts (cont.) (表⾯镀层 – 电镀的接触⽚(续)…

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Target Condition - Class 1,2,3(⽬标条件 - 1,2,3级)
Contacts are free of pits, pinholes and surface nodules.
No exposed copper or plating overlap between solder finish or
solder mask and tip finish.
片上没有麻点针孔和表面
与接端涂没有露铜也
没有层重叠
Acceptable - Class - 1,2,3 (Critical Contact Area)
(可接受条件 - 1,2,3级(关键接触区)
Surface defects do not expose underlying metal in critical contact
area.
Solder splashes or tin-lead plating does not occur in critical con-
tact area.
No nodules and metal bumps in critical contact area.
Pits, dents or depressions do not exceed 0.15 mm [0.00591 in] in
their longest dimension. There are not more than three per con-
tact, and they do not appear on more than 30% of the contacts.
在接区内表面缺陷没有
在接区内没有出的料或锡铅镀层
在接区内没有属突出。
麻点陷处的最长尺寸0.15mm[0.00591in]
片上的缺陷不3处,有这些缺陷的接片不
过接总数30%
Acceptable - Class 3 (Gap/Overlap Area)
(可接受条件 - 3级(露铜/重叠区域)
Exposed copper or plating overlap is 0.8 mm [0.031 in] or less.
露铜/镀层重叠于等于0.8mm[0.031in]
Acceptable - Class 2 (Gap/Overlap Area)
(可接受条件 - 2级(露铜/重叠区域)
Exposed copper or plating overlap does not exceed 1.25 mm
[0.04921 in].
露铜/镀层重叠区不1.25mm[0.04921in]
Acceptable - Class 1 (Gap/Overlap Area)
(可接受条件 - 1级(露铜/重叠区域)
Exposed copper or plating overlap does not exceed 2.5 mm
[0.0984 in].
露铜/镀层重叠区不2.5mm[0.0984in]
Note 1: Discoloration is permitted in the plating overlap zone.
Note 2: Critical Contact Area. These conditions do not apply to a band 0.15 mm [0.00591 in] wide around the periphery of the printed con-
tact land.
注1:镀层重叠允许
注2:区域。这些条件不适用于包括印制接盘周0.15mm[0.00591in]的区域。
271a
271b
2.7 PRINTED CONTACTS(印制接触⽚)
2.7.1 Surface Plating Plated Contacts(表⾯镀层 电镀的接触⽚)
39IPC-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。
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