WEE Technology Company Limited - WEE are Capacitors Specialist
CBB21X and CL21X belong to ultra small thin film capacitors. In many circuits, the volume of capacitors is very small. The traditional CBB21 and CL21 capacitors with large volume are no longer suitable. At this time, CBB21X and CL21X capacitors can be used.

CL21X is a subminiature metallized polyester film capacitor. Its advantages are high temperature resistance of 120 ℃ and small size. Its disadvantages are that its loss is higher than that of CBB21X, so it can only be used in DC and low pulse occasions.

CBB21X is a subminiature metallized polypropylene film capacitor, which is resistant to high temperature of 105 ℃, low loss, ≤ 0.0008%, and small internal temperature rise. It is suitable for various circuits with large AC and DC pulses, and is mostly used in circuits requiring small size, low loss and high stability.

It is difficult to see the difference between the two capacitors from the appearance. The CL21X capacitor is used more, but CBB21X has small loss, good stability and high reliability, and can be used in circuits with higher frequency.

The smaller the film capacitor, the better the production?

At present, capacitors are developing towards miniaturization. However, from the perspective of production difficulty, the smaller the size, the greater the difficulty of production. Therefore, most capacitor manufacturers in the industry are only good at producing large capacitors, not small capacitors.

Check more detalis at below link for WFH CL21X specifications:

https://www.weetcap.com/pdf/WEET-WFH-Mini-Metallized-Polyester-Film-Capacitors.pdf