What Is a Radial Capacitor?
A radial capacitor is defined by its lead style: both leads exit from one end. This page covers radial vs axial differences, polarity basics, and a practical replacement checklist.
Radial Capacitor Meaning in Practice
In procurement and engineering documentation, radial capacitor usually refers to a through-hole part with both leads at the bottom of a cylindrical can. The term does not define dielectric by itself. Most often, you will see it used for aluminum electrolytic capacitors.
Because modern assemblies are PCB-first, radial packages are more common than axial in new designs. They are also widely used as replacement parts in maintenance and repair.
Radial vs Axial Capacitors
| Feature | Radial | Axial |
|---|---|---|
| Lead orientation | Both leads from one end | One lead at each end |
| Typical mounting | Through-hole PCB with vertical body | Through-hole or point-to-point wiring |
| Availability | Very high in current production | More limited for many values |
| Common use | Power supplies, consumer and industrial boards | Legacy equipment and retrofit repairs |
Radial Capacitor Replacement Checklist
Match capacitance and tolerance from the original part.
Use equal or higher voltage rating with suitable derating margin.
Verify temperature rating and ripple-current capability.
Confirm polarity orientation on polarized electrolytics.
Check body diameter, height, and lead spacing for board fit.
For polarity-sensitive parts, confirm stripe direction before power-up. If needed, use our capacitor testing guide and polarity guide.
Frequently Asked Questions
What is a radial capacitor?
A radial capacitor has both leads coming out of the same end of the body, typically the bottom. Radial lead style is common for electrolytic capacitors used in power supplies and general electronics.
What is the difference between radial and axial capacitors?
Radial capacitors have two leads from one end, while axial capacitors have one lead from each end. Radial types are more common in modern PCB layouts; axial types are often used in legacy or point-to-point wiring.
Are radial capacitors polarized?
Most radial aluminum electrolytic capacitors are polarized and must be installed with correct polarity. Film and ceramic radial capacitors are usually non-polarized.
Can I replace an axial capacitor with a radial capacitor?
Yes, if electrical ratings match and the radial part can be mounted safely with proper lead routing and mechanical support. In many repairs, radial replacements are common for obsolete axial parts.