Overview
Choosing between SMD (Surface-Mount Device) and Through-Hole resistors can significantly impact your PCB design, manufacturing cost, and reliability. This guide compares both types in terms of features, performance, and applications to help engineers make the right choice.
What Are SMD Resistors?
SMD resistors are miniature resistors designed to be mounted directly onto the surface of PCBs. They're part of modern surface-mount technology (SMT).
Characteristics:
- No leads — soldered directly onto pads
- Very compact (sizes like 0603, 0805, etc.)
- Suited for automated assembly
What Are Through-Hole Resistors?
Through-hole resistors have long leads that are inserted into holes on a PCB and soldered on the opposite side. This older technology is still used where mechanical strength is essential.
Characteristics:
- Long leads that go through the PCB
- Larger size, easy to handle manually
- Reliable under mechanical stress
SMD vs Through-Hole: Pros and Cons
| Aspect | SMD Resistors | Through-Hole Resistors |
|---|---|---|
| Size | Extremely compact | Bulky |
| Assembly | Automated (SMT) | Manual or wave soldering |
| Durability | Less mechanical strength | High mechanical strength |
| Cost | Lower (in high-volume) | Higher (labor-intensive) |
| Design Flexibility | Ideal for compact layouts | Better for prototyping or repairs |
Best Use Cases
- SMD Resistors: Smartphones, tablets, wearables, consumer electronics, high-volume PCB manufacturing
- Through-Hole Resistors: Power supplies, automotive electronics, test equipment, prototyping
Engineers often use both types on hybrid boards depending on mechanical and electrical requirements.
Video Comparison
Watch this short video to visualize the differences between SMD and through-hole resistors:
Frequently Asked Questions
Q: Are SMD resistors more accurate than through-hole ones?
A: SMD resistors often come with tighter tolerances due to advanced manufacturing, but precision types exist in both formats.
Q: Can I mix both on one PCB?
A: Yes. Many industrial boards use through-hole for connectors or high-current parts and SMD for the rest.
Q: Which is better for DIY?
A: Through-hole resistors are easier to solder manually, making them ideal for hobbyists and prototyping.
Need Resistors for Your Next Project? Choose Onzuu.
Onzuu provides a wide range of SMD and through-hole resistors for all your electronic design needs. Whether you’re an OEM, system integrator, or prototyping team, we offer quality components with global logistics support. Browse our catalog or contact us for bulk pricing and datasheets.
Recommended Reading: Ultimate Guide to Resistors
