Why do through-hole components fail to solder correctly down onto the PCB?

I am an electrical engineer in a company. Recently I am developed a new product in lab and making a sample for further confirmation. When I solder TH component, feel a little troublesome. Any soldering expert to help?

September 13, 2023

(Even the soldering process is under the suggested temperature.)

1.Component’s lead temperature is too cold and cannot form a good solder join.

2.Through-Hole Dimensions on the PCB are insufficient (too small)

3.Physical damage to the solder joint after soldering
After soldering, some processes may cause physical stress and fracturing, such as installing a heat sink on the surface, or installing unfitted plastic case molding.

#PCB Assembly #THT PCB Assembly #Manufacturing

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

Oliver Smith

What Others Are Asking

How can I tell whether an SMT/SMD capacitor is oriented with plates horizontal or vertical?

Is there an industry standard for showing how plates in the SMT cap are oriented? How can you tell if it is a square-rectanguloid instead of being flattish in one dimension?

Oliver Smith November 3, 2023

What are the black spots in lead-free solder joints on PCB?

I am prototyping a PCB, using Chip Quik’s “SMDSWLF.031, a Sn96.5/ Ag3.0/ Cu0.5 solder with 2.2% no-clean flux. I find that the black spots appears frequently in larger pads on my board. I wonder if it is because I left the soldering iron more time heating the solder and that burnt the flux. What is that black residue? Is that a sign of a bad joint or maybe bad soldering technique?

Oliver Smith December 1, 2023

How can we identify the BGA area of PCB?

Hear about BGA PCB Assembly service, but I never order it. How can we identify the BGA area of PCB? Just very curious.

Oliver Smith October 20, 2023

Why do through-hole components fail to solder correctly down onto the PCB?

Oliver Smith

Oliver Smith

What Others Are Asking

How can I tell whether an SMT/SMD capacitor is oriented with plates horizontal or vertical?

What are the black spots in lead-free solder joints on PCB?

How can we identify the BGA area of PCB?

Read Detailed Advice From Blog Articles