Through-Hole Assembly

Through-hole PCB assembly is still a very popular technique for assembling electronic components today, inserting electronic components through holes in the PCB and soldering the components to the board by wave soldering or hand soldering. At Fubon Precision, we have complete through hole PCB assembly capabilities that enable us to serve customers from different industries well. We are capable of handling almost all types of printed circuit boards, whether it is a single-layer PCB, a double-sided PCB, or a high-density multi-layer PCB.


Electronic circuits are created using the through-hole assembly technique, in which the elements are inserted using leads. It describes the installation procedure in which the leads are inserted into the pre-drilled holes and the components are soldered to the board using either wave solder or manual soldering.

PCB design evolved from single-sided to double-sided, and finally to multi-layer boards. It is challenging to adapt through-hole assembly to the needs of contemporary electronics PCB. In today’s PCB manufacturing, SMT Technology has essentially taken the place of through-hole construction. It is important to keep in mind that through-hole assembly is not very effective for multi-layer PCBs because it consumes board area on every layer.

Features of the through-hole PCB assembly
  • High reliability
  • Easy to operate manually 
  • Higher durability 
  • Lower manufacturing efficiency 
  • Limited PCB design
Applications of Through-hole PCB Assembly

Through-hole components (THCs) are appropriate for high-reliability items that require a metallurgical bonding between layers. Since their leads pass via board perforations, they can resist greater environmental stress. Because of this, through-hole PCB assembly is frequently used in aerospace and military items that could be damaged by high temperatures, collisions, or rapid acceleration. Through-hole technology is also utilized in testing and prototypes, which may necessitate human replacement and correction.

Advantages And Disadvantages Of Through-Hole Assembly

For items that are prepared to be subjected to mechanical stress, through-hole mounting suggests a greater mechanical connection. Additionally, through-hole assembly is popular for testing and prototyping and is simple to replace and tune manually. Because through-hole component leads must pass through time-consuming and expensive holes on the board. Multi-layer PCBs routing space is also constrained by through-hole mounting because all layers of the boards must be covered by the drilled holes. Through-hole mounting soldering relies on wave soldering or hand soldering, which presents challenges for reliability and repeatability as well as decreased manufacturing efficiency.

Our Through Hole PCB Assembly Capabilities

We provide through-hole PCB services to a variety of industries including medical, electronics, instrumentation, and military, all thanks to our complete assembly capabilities:
• Hand soldering                                                         • Dual wave flow solder
• Hand Insertion of components                              • Automate axial or radial insertion
• RoHS soldering using tin-lead solder                   • Use of high and low melting point solder
• Prototype build to high-volume assembly           • Functional test and automated inspection
• Support various types of PCBs including metal core PCBs, Rigid PCBs, Flex-rigid PCBs, FR4 PCBs, etc.