午夜夜伦鲁鲁片免费无码-国产裸拍裸体视频在线观看-亚洲无码视频在线-学生妹亚洲一区二区-国产亚洲欧美日韩亚洲中文色

鑫景福致力于滿足“快速服務,零缺陷,輔助研發”PCBA訂購單需求。
行業新聞
行業新聞
Look at the pcb resin plug hole and cover green oil
09Nov
Jeff 0條評論

Look at the pcb resin plug hole and cover green oil

1. A headache in PCB industry, customers often design VIA holes with green oil and no windows on both sides, or some windows with green oil or windows on one side. How should we deal with this design

Answer: What surface treatment should we first consider for this PCB? If it is HALS, we must avoid the single-sided plug hole process, because the depth of the single-sided plug hole is low, it is easy to cause solder bead plugging during tin spraying, and the solder bead plugging has a great impact on the appearance.

In case of other surface treatment, such as gold, OSP, silver, etc., single side is acceptable. After considering the above factors, we will look at the customer's green oil window design. If the window is partially opened, we should try to avoid using green oil to cover the hole edge, and allow green oil to enter the hole, because this way is also easy to cause solder beads.

To sum up the above two situations, the best treatment is to allow 1-2

pcb board

MIL tin coils on the side of double sided plug holes or green oil cover holes, whICh is most popular with PCB manufacturers. Of course, the oil plugging here is for ordinary photographic oil, not thermosetting oil.

2. When the green oil window is opened, it is generally stipulated that the green oil cannot enter the through hole. However, the green oil plug hole requires the green oil to enter the hole. Have questions about this?

Answer: The green oil is used to open windows (mainly for the plug-in holes, mounting holes, test points, etc. of surface mounted pads and devices. At this time, the green oil cannot cover PCB pads and holes, because the green oil is a non-conductive substance. If it is inserted into the hole or disk, it will cause poor welding, poor detectability, etc.)

Resin plug hole

A. If you want to get a PCB board, all via pad surfaces and holes are sprayed with tin (or other surface processes) like other device pads. When you process data, you need to open a window for solder blocking. The via has good conductivity.

B. If the density of your PCB board is very high, it is better to require a plug hole for vias, that is, fill the vias arm with green oil and seal the surface. This will reduce short circuit during welding.

C. Of course, the silk screen should be strict. If it is pressed onto the plate to be welded, the reliability cannot be guaranteed during PCB welding.

3. What is the standard of BGA plug hole? SometiMES a plug hole is required, sometimes a plug hole is not required. I don't know when to plug it, but when not to plug it, thank you

Answer: For vias close to the pad or densely wired vias (less than 0.4mm in size, usually 0.3/0.25mm), plug holes are required to prevent short circuit. Through hole at the bottom of BGA: if it is not a test point, it needs to be plugged to prevent short circuit and tin bead. If you want to use it as a test point, you can open a window on the bot side, open a SMAll window on the top side or cover it with green oil. (When the pitch of bga is large, it is recommended to open a small window at the test point. When the pitch is less than 1mm, it is recommended to cover it with green oil.)

點擊
然后
聯系
主站蜘蛛池模板: 久久久久久a亚洲欧洲av冫| 成人午夜福利视频| 国产亚洲精品久久久性色情软件| 一区二区三区四区在线 | 欧洲| 色一乱一伦一图一区二区精品| 精品国产在天天线2019| 狠狠躁夜夜躁青青草原软件| 无码专区人妻丝袜| 伊人久久久精品区aaa片| 国产网曝门亚洲综合在线| 国产av人人夜夜澡人人爽| 射精情感曰妓女色视频| 亚洲精品国产av成拍色拍个| 狼友av永久网站免费观看| 亚洲欭美日韩颜射在线二| 日日躁夜夜躁狠狠久久av| 精品国产综合成人亚洲区| 东京热无码一区二区三区分类视频 | 国产精品人妻免费精品| av狠狠色超碰丁香婷婷综合久久 | 国内精品免费久久久久电影院97| 亚洲狼人伊人中文字幕| 无码熟熟妇丰满人妻啪啪| 自拍偷自拍亚洲精品10p| 极品人妻被黑人中出种子| 中文字幕日韩人妻不卡一区| 欧美熟妇乱子伦xx视频| 人妻熟妇乱又伦精品无码专区| 中文字幕无码日韩中文字幕| 中文有码无码人妻在线短视频 | 人妻系列无码一区二区三区| 国产97人人超碰caoprom三级| 8x福利精品第一导航| 影音先锋熟女少妇av资源| 老熟女五十路乱子交尾中出一区| 少妇人妻互换不带套| 日本不卡高字幕在线2019| 性色做爰片在线观看ww| 无码av中文一区二区三区| 国产免费无遮挡吸乳视频| 18禁成人黄网站免费观看|