Three Types of Soldering PCB in MOKO
PCB circuit assemblies using both types of components, SMD and PTH, require special handling because they each use different soldering techniques. MOKO technology has enough experience and engineer can help you manufacture your PCB.
1. Surface Mounted Technology(SMT) Soldering
SMDs can be attached to the PCB using reflow soldering or wave soldered.
In the reflow process, solder paste is applied to the solder pads of the PCB using a stencil, and the SMDs are placed with their leads on top of the solder paste. Both the SMDs and the PCB are heated, reflowing (melting) the solder, connecting the leads of the components to the solder pads on the PCB.
To wave solder, when connecting the SMDs to the PCB, instead of reflow the solder paste, a wave of solder can be used. However, after the components are placed on the board, the board has to be turned over. To keep the components from falling off the PCB as it’s turned over for wave soldering, and having the wave of solder wash off any remaining SMDs, the SMDs first have to be glued in place onto the PCB.
2. Pin Through Hole(PTH) Soldering
Pin-Through-Hole devices, or Plated Through-hole Devices (PTH) must be wave soldered.
After the PTH components are inserted into the holes of the PCB, and without turning the board over, the PCB is passed over the wave of solder, connecting the component leads to the printed circuit board.
3. Mixed Components Assembly Soldering
When both SMT and PTH devices are used on the same assembly, several steps are needed for soldering:
A. On the component side of the PCB, the SMDs are placed and reflow soldered;
B. The board is turned over and on the solder side, without soldering them, the SMDs are then glued in place;
C. The board is turned over again, and passing their leads through the holes in the PCB from the component side, PTH components are machine inserted;
D. At this time, special-handling components are inserted into the PCB by hand;
E. The solder side of the PCB is wave soldered, soldering the SMDs glued to the solder side of the PCB, the leads of the PTH components, and the leads of the special handling components, all in one step
F. The board is tested.
MOKO technology has both experiences and engineers in all three types of assembly SMD, PTH, and mixture of both SMD and PTH. Let our engineers in MOKO help you to design and work with your PCB.