Many capacitors do not have polarity, like chip MLCC chip ceramic capacitors, and radial film capacitors, CL21 metallized polyester film capacitors, and CBB21 metallized polypropylene film capacitors. All these mentioned do not have capacitors polarity.
While, tantalum capacitors have polarity. And normally capacitors manufacturers will mark polarity on tantalum capacitors body.
The tantalum capacitors factory UF Capacitors offer different kinds of Tantalum capacitors as follow:
** CA42 Series Dipped Tantalum Capacitors (Radial Tantalum Capacitor)
** CA45 Series Standard tantalum capacitors
** CA55 Polymer tantalum capacitors
For these different series of tantalum capacitors, how tantalum capacitors manufacturer UF Capacitors mark the polarity?
CA42 radial dipped tantalum capacitors polarity marking
Normally for radial tantalum capacitors, the tantalum capacitors manufacturer will mark + for positive lead, and the other one is negative lead.
Normally positive lead is longer, while negative lead is shorter.
CA45 chip standard tantalum capacitors polarity marking
For standard chip tantalum capacitors in surface mount type, there is no leads for this type tantalum capacitors.
So tantalum capacitors suppliers UF Capacitors will produce different color for users to identify the polarity. Dark color mean anode/positive, while light yellow mean cathode / negative
CA55 Polymer Tantalum Capacitors polarity marking
CA55 series polymer tantalum capacitors is in surface mount type. Some polymer tantalum capacitors factory will mark "+" for positive. Other polymer tantalum capacitors suppliers will put different color for positive and negative.
UF Capacitors print white color to show users positive.
Look from below photo, you will understand easily
UF Capacitors supply and offer tantalum capacitors, polymer tantalum capacitors, and radial dipped tantalum capacitors to overseas market for long time. The main supplier AVX and Kemet do not have stable supply and stable prices. If you want to find good supplier, chinese capacitors factory UF Capacitors could be good choice. https://www.ufcapacitors.com/
