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越来越多的电路板采用表面贴装元件

网址:www.shuoersen.com.cn  2022-08-06  作者:admin    阅读:

现在越来越多的电路板采用表面贴装元件,同传统的封装相比,它可以减少电路板的面积,易于大批量加工,布线密度高。贴片电阻和电容的引线电感大大减少,在高频电路中具有很大的优越性。表面贴装元件的不方便之处是不便于手工焊接。为此,电路板焊接工程师以常见的PQFP封装芯片为例,介绍表面贴装元件的基本焊接方法。
Nowadays, more and more PCB uses surface mount components, compared with traditional packaging, it can reduce the area of circuit boards, simultaneous interpreting in large quantities, and high wiring density. The lead inductance of chip resistor and capacitor is greatly reduced, which has great advantages in high frequency circuit. The inconvenience of surface mount components is that it is not convenient for manual welding. Therefore, the circuit board welding engineer takes the common PQFP package chip as an example to introduce the basic welding methods of surface mount components.
一、所需的工具和材料
1、 Tools and materials required
焊接工具需要有25W的铜头小烙铁、金桥焊条,有条件的可使用温度可调和带ESD保护的焊台,注意烙铁尖要细,顶部的宽度不能大于1mm。一把尖头镊子可以用来移动和固定芯片以及检查电路。还要准备细焊丝和助焊剂、异丙基酒精等。使用助焊剂的目的主要是增加焊锡的流动性,这样焊锡可以用烙铁牵引,并依靠表面张力的作用光滑地包裹在引脚和焊盘上。在焊接后用酒精清除板上的焊剂。
The welding tools shall be equipped with 25W copper head small soldering iron and Jinqiao electrode. If possible, the welding table with adjustable temperature and ESD protection can be used. Note that the tip of the soldering iron shall be thin and the width of the top shall not be greater than 1mm. A pair of pointed tweezers can be used to move and fix chips and check circuits. Also prepare fine welding wire, flux, isopropyl alcohol, etc. The purpose of using flux is to increase the fluidity of solder, so that solder can be pulled by soldering iron and smoothly wrapped on pins and pads by surface tension. After welding, remove the flux from the plate with alcohol.

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