THT vs SMT – which assembly technology is best for your project?

THT vs SMT – which assembly technology is best for your project?

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.

1. What is THT (Through-Hole Technology)?

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:

• High resistance to vibration and mechanical stress
• Ideal for large or heavy-duty components
• Requires drilling and often manual assembly
• Higher production costs and slower process

Typical applications:

• Industrial automation and energy systems
• Outdoor or rugged devices
• Military and transport electronics

2. What is SMT (Surface Mount Technology)?

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:

• High assembly density
• Fast turnaround and automated process
• Double-sided mounting capability
• Lower unit cost for high volumes

When SMT may not be enough:

• In high-vibration or high-stress environments
• When using components only available in THT versions
• Where serviceability and part replacement are priorities

3. THT vs SMT – Technology Comparison

4. Mixed assembly – when does combining SMT and THT make sense?

Example projects:

• PCBs with SMT components and THT connectors
• Communication modules with double-sided assembly
• Devices that require both miniaturization and durability

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.

5. How to choose the right technology for your project?

• What types of components are in your BOM – SMT or THT?
• What are the operating conditions of your product?
• What is the production volume?
• Is miniaturization important?
• Is ease of servicing required?

Support from Elhurt EMS

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.

6. Summary

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.

7. Call to action

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.

contact@elhurt.com.pl