Choosing between THT (Through-Hole Technology) and SMT (Surface Mount Technology) is a critical decision that affects the quality, reliability, and cost of your electronic device. While SMT has become the standard due to efficiency and miniaturization, THT still plays an important role—especially where mechanical durability is key.
At Elhurt EMS, we support industrial, military, and energy sector clients whose projects often require a tailored approach to assembly. In this article, we compare THT and SMT technologies, showing where each excels—and why mixed technology is increasingly becoming the standard.
How does THT work?
Through-Hole Technology involves inserting component leads through drilled holes in the PCB and soldering them on the opposite side. This method offers strong mechanical bonds and is commonly used in harsh environments such as military, transport, and industrial applications.
Advantages and limitations:
Typical applications:
How does SMT work?
SMT involves mounting components directly onto the surface of the PCB without the need for holes. It enables double-sided assembly, automation, and high-density layouts, reducing production time and cost for mass production.
Advantages of SMT:
When SMT may not be enough:
| Criterion | SMT | THT |
|---|---|---|
| Production cost | Lower (for high volumes) | Higher (due to manual steps) |
| Assembly density | High – miniaturization, both sides of PCB | Low – larger parts, drilled holes required |
| Mechanical strength | Moderate | High |
| Automation potential | Very high | Limited |
| Assembly speed | Fast | Slower |
Example projects:
How does it work in practice?
Mixed assembly requires precise planning. Typically, SMT is done first, followed by THT and selective soldering. Proper documentation and quality control at every step are essential to ensure success.
We provide DfM consulting and support in technology selection at the design stage. We analyze BOMs, PCB layouts, and technical requirements to help choose the optimal assembly solution.
SMT is ideal for fast, cost-effective, and repeatable production. THT is essential where strength and reliability are critical. For many B2B applications, the best solution is often a hybrid assembly that combines the strengths of both methods.
Not sure which assembly method to choose?
Get in touch with Elhurt EMS – we’ll review your design and recommend the best solution for your specific needs.