Determining the Capacitor Voltage Rating: How to Read the “Code” on the Capacitor Case?

Our Digi-Key engineers often receive this question from customers: How to confirm the voltage rating of an aluminum electrolytic capacitor that does not have a voltage rating mark?

Q: There is no rated voltage mark on the capacitor, how to determine its rated voltage

Our Digi-Key engineers often receive this question from customers: How to confirm the voltage rating of an aluminum electrolytic capacitor that does not have a voltage rating mark?

However, when we look closely at these capacitors, we will find that some aluminum electrolytic capacitors have a voltage rating marked on the surface in the form of some factory-specific letters. Here are some examples for your reference.

Below is a diagram of silkscreen markings for Rubycon’s TZV series capacitors.

Determining the Capacitor Voltage Rating: How to Read the “Code” on the Capacitor Case?

Determining the Capacitor Voltage Rating: How to Read the “Code” on the Capacitor Case?

A similar chart is available for Cornell Dubilier’s AFK series capacitors.

Determining the Capacitor Voltage Rating: How to Read the “Code” on the Capacitor Case?

However this approach is not standard, as some capacitors do list voltage values. The actual capacitance of Kemet’s EDK series capacitors is listed in the figure below.

Determining the Capacitor Voltage Rating: How to Read the “Code” on the Capacitor Case?

The Links:   G080UAN010 NL8060BC21-04 IGBT-SUPPLIER

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