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PCB Technology

PCB Technology - Difference between spray soldering and lead-free spray soldering of pcb

PCB Technology

PCB Technology - Difference between spray soldering and lead-free spray soldering of pcb

Difference between spray soldering and lead-free spray soldering of pcb
2020-11-06
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Author：Dag
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The process requirements in PCB production are a very important factor, which directly determines the quality and positioning of a PCB.


For example,HASL immersion gold, relatively speaking, immersion gold is for high-end PCBs. Immersion gold is relatively high relative to cost due to its good quality.


Therefore, many customers choose the commonly used tin spray process. Many people know about the tin spraying process, but they don’t know that tin is divided into leaded tin and lead-free tin.


Today ipcb will tell you in detail the difference between lead-tin PCB and lead-free tin PCB for your reference.


1.From the surface of tin, HASL is relatively bright, while lead-free HASL (SAC) is relatively dull. The wettability of lead-free is slightly worse than that of lead-free.


2.Lead in lead is harmful to human body, but lead-free is not. The leaded eutectic temperature is lower than lead-free PCB. How much depends on the composition of the lead-free alloy,


The eutectic of SNAGCU is 217 degrees, and the welding temperature is the eutectic temperature plus 30-50 degrees. This depends on the actual adjustment. The leaded eutectic is 183 degrees. Leaded is superior to lead-free in terms of mechanical strength and brightness.

Lead-free HASL PCB

Lead-free HASL PCB

3.The lead content of lead-free tin does not exceed 0.5, and the lead content reaches 37.


4.Lead will increase the activity of the tin wire during the soldering process. Leaded tin wire is better than lead-free tin wire,but lead is toxic and is not good for the human body when used for a long time, and the melting point of lead-free tin is higher than that of lead-free tin. This makes the solder joints stronger.


5.What is the difference between lead-free HASL PCB and HASL PCB? What temperature is it now?

5.1.PCB lead-free tin spraying is environmentally friendly and does not contain the harmful substance "lead". The melting point is about 218 degrees;the temperature of the tin spraying furnace needs to be controlled at 280-300 degrees; the peak temperature needs to be controlled at about 260 degrees;the reflow temperature is 260-260 degrees. 270 degrees.

5.2.HASL PCB  are not environmentally friendly.Contains the harmful substance "lead",with a melting point of about 183 degrees;the temperature of the tin spray furnace needs to be controlled at 245-260 degrees; the peak temperature needs to be controlled at about 250 degrees it exceeds.Reflow temperature 245-255 degrees