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Aluminum Axial Electrolytic Capacitors

What is meant by the term “axial lead”?

It’s a commonly asked question. An axial lead capacitor has leads that run parallel with the body of the capacitor and they come out at two opposite ends. Meanwhile a capacitor with radial leads has both coming out of one side of the capacitor.

Note: Axial leaded capacitors are ideal for low profile circuit board applications.

Please refer to the pictures below:






Axial electrolytic capacitors generally are polarized, with one lead being positive and the other being negative. Typically these capacitors tend to have a plus sign on the positive side to denote which lead is positive. However axial electrolytic capacitors can also be non-polarized, but they are not as popular as the polarized variants.

Popular non-polarized
axial aluminum electrolytic capacitor series:

Polarized Capacitor Symbol

(The plus signs denote that right lead is positive)

Temperature Ratings

Here is list of popular temperature ratings
for aluminum axial electrolytic capacitors:

  • -40°C to 85°C = Standard
  • -40°C to 105°C = High Temp.
  • -40°C to 125°C = Extreme Temp.

When you exceed voltages higher than 450VDC, the temperature rating gets a de-ratated down to 65°C.

Voltage Ratings

Aluminum axial electrolytic capacitors have a fairly wide voltage range from 3VDC all the way up to 500VDC. However for off the shelf delivery, you will find that voltages below 450VDC are easier to find.

Capacitance & Tolerance Ratings

The capacitance range for these capacitors typically ranges from .1mFd (microFarads) to 15,000 mFd.

Common tolerance ratings:

  • ±10%
  • ±20%
  • -10% - +30%
  • -10% - +50%
  • -10% - +75%


The size of aluminum axial electrolytic capacitors is typically measured in millimeters, with the diameter being the first dimension followed by the length. Size can vary from manufacturer to manufacturer even when the capacitance and voltage might be the same.

You can use the tool below to convert Inches to MiliMeters or vice versa.

size diagram

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Aluminum Axial Electrolytic Capacitors can be found in equipment such as power supplies, communication equipment, and A/V Systems