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Difference Soldering SMT Chips And Through-hole Components

- Aug 20, 2018 -

SMT electronic components are extremely small and light weight, and the electronic components are easier to solder than through hole components. Another important benefit of the SMD component is the improved stability and reliability of the circuit, which increases the success rate of the fabrication. This is because the surface mount electronic components do not have leads, which reduces stray electric fields and stray magnetic fields, which is especially noticeable in high frequency analog circuits and high speed digital circuits.



SMT electric components are soldered by placing the components on the pads and then applying the adjusted solder paste to the component leads and pads (not too much to prevent short circuits), then Use a 20W internal heating soldering iron to heat the joint between the pad and the SMT chip component (temperature should be 220~230 °C). After the solder is melted, the soldering iron can be removed. After the solder solidifies, the soldering is completed. After welding, you can use the tweezers to clamp the clip components to see if there is looseness. If there is no looseness (should be very strong), it means that the welding is good. If there is looseness, re-smear the solder paste and re-weld according to the above method.


SMT lead component soldering method: When soldering all the leads, solder should be applied to the soldering iron tip, and all the leads should be coated with flux to keep the pins wet. Touch the end of each pin of the chip with a soldering iron tip until you see solder flowing into the pins. Keep the tip of the soldering iron in parallel with the soldered lead during soldering to prevent overlap due to excessive soldering.


After soldering all the leads, wet all pins with flux to clean the solder. Remove excess solder where needed to eliminate any shorts and overlaps. Finally, use tweezers to check for solder joints. After the inspection is completed, remove the flux from the board and dip the hard brush with alcohol and carefully wipe it along the lead until the flux disappears.


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