SMD vs Through-Hole Components: When to Use Which in 2026
SMD vs Through-Hole Components: When to Use Which in 2026
*Published: 2026-06-21 | Category: Components Guide | Author: PartsCube Global*
The Short Answer
Use SMD for everything unless you have a specific reason to use through-hole.
That's not an exaggeration — the exceptions are real: high-power components, mechanical stress points (connectors), prototyping/breadboarding, and repair/replacement markets.
SMD vs Through-Hole Comparison
| Factor | SMD | Through-Hole |
| PCB space | Much smaller | 3-5× larger |
| Assembly cost | Low (automated) | High (often manual) |
| Prototyping | Harder (needs adapter boards) | Easy (breadboard) |
| Rework/repair | Possible with hot air | Easy with soldering iron |
| Mechanical strength | Lower | Higher |
| High-frequency performance | Better (shorter leads) | Worse (lead inductance) |
| Availability | Growing | Shrinking |
| Component cost | Cheaper per unit | More expensive |
When Through-Hole Still Makes Sense
1. Connectors and Mechanical Stress Points
USB ports, barrel jacks, screw terminals — these take physical abuse. Through-hole mounting provides mechanical anchoring, and we've seen SMD connectors tear their pads off boards where through-hole parts kept working.
2. High-Power Components
Large electrolytic capacitors, power resistors, transformers — the lead mass and thermal requirements favor through-hole.
3. Prototyping and Education
Breadboards require through-hole. If your market is makers and students, DIP packages sell.
4. Repair and Replacement
Many legacy products (industrial equipment, audio gear) use through-hole. The repair market needs these parts.
SMD Sizes You Should Know
| Size | Dimensions | Hand-Solderable? |
| 1206 | 3.2×1.6mm | ✅ Very easy |
| 0805 | 2.0×1.25mm | ✅ Easy |
| 0603 | 1.6×0.8mm | ✅ Doable with practice |
| 0402 | 1.0×0.5mm | ⚠️ Needs good tools |
| 0201 | 0.6×0.3mm | ❌ Machine only |
For prototyping and hand assembly, use 0805 passives. Small enough for compact layouts, still easy to hand-solder.
The Trend
New ICs are increasingly SMD-only. Take the ATmega328P: its DIP-28 version keeps getting pricier and harder to find while the SMD variants stay plentiful. When we order the DIP for repair customers, we plan for extra lead time. If you're designing new products, design for SMD.
PartsCube Global stocks both SMD and through-hole components. Contact us for your specific requirements.
References
Written by Ling Zhang
BOM & Sourcing Specialist · Guangzhou, China
Ling helps customers turn BOM lists into deliverable quotes, specializing in alternative part matching and cost optimization. She joined from a component trading background in Guangdong.
View all articles by Ling →Need help sourcing these components?
PartsCube Global stocks all alternatives mentioned in this guide. Search our catalog or submit your BOM for a quote.
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