What is the minimum working temperature of Cbb21 105j400v?
Aug 14, 2025| Hey there! As a supplier of Cbb21 105j400v capacitors, I often get asked about the minimum working temperature of these little guys. So, I thought I'd write a blog post to share some insights on this topic.
First off, let's quickly go over what the Cbb21 105j400v capacitor is. The Cbb21 series is a type of metalized polypropylene film capacitor. These capacitors are known for their excellent electrical properties, such as low loss, high insulation resistance, and good self - healing ability. The "105" in the model number indicates the capacitance value. Using the standard capacitor value coding system, 105 means (10\times10^{5}) picofarads, which is equal to 1 microfarad ((\mu F)). The "j" represents the tolerance, which is (\pm5%), and "400v" is the rated voltage, meaning it can handle up to 400 volts.
Now, let's talk about the minimum working temperature. The minimum working temperature of a Cbb21 105j400v capacitor typically ranges from - 40°C to - 25°C. But why does this matter? Well, the temperature affects the performance of the capacitor in several ways.
At extremely low temperatures, the dielectric material in the capacitor, which is polypropylene in the case of Cbb21 capacitors, becomes more rigid. This can lead to changes in the capacitance value. Generally, as the temperature drops, the capacitance may decrease slightly. For most applications, a small change in capacitance might not be a big deal. However, in some precision circuits, even a tiny deviation can cause problems.
Another aspect is the equivalent series resistance (ESR). At low temperatures, the ESR of the capacitor can increase. A higher ESR can result in more power dissipation within the capacitor, which in turn can lead to heating and potentially reduce the lifespan of the component.
When it comes to choosing a capacitor for a particular application, it's crucial to consider the operating temperature range. If your device is going to be used in a cold environment, like in outdoor equipment during winter or in some industrial applications in cold storage facilities, you need to make sure the capacitor can handle those low temperatures.
If you're comparing different models, you might also be interested in related products like the Mkp Capacitor. The Mkp capacitor is also a metalized polypropylene film capacitor, and it shares some similarities with the Cbb21 105j400v in terms of performance characteristics. But depending on the specific design and application, it may have a different temperature range and other properties.
Similarly, the 104j 400v Capacitor has a different capacitance value (104 means (10\times10^{4}) picofarads, or 0.1 microfarads). It can be used in different circuits, and its performance at low temperatures also needs to be evaluated based on your requirements.
And then there's the CBB21 - Film Capacitor 250V. This one has a lower rated voltage compared to the 400v version. It might be more suitable for applications where the voltage requirements are not as high, but again, the temperature factor plays an important role in its performance.
So, how do you ensure that the Cbb21 105j400v capacitor works well in low - temperature conditions? First, make sure to choose a high - quality capacitor from a reliable supplier. High - quality capacitors are usually better engineered to handle a wider temperature range. Second, you can also consider adding some temperature compensation circuits in your design. These circuits can adjust for the changes in capacitance and ESR caused by temperature variations.
In some cases, you might need to do some testing. You can simulate the low - temperature environment in a laboratory setting and measure the performance of the capacitor. This way, you can get a better understanding of how it will behave in real - world applications.
As a supplier, I can offer you high - quality Cbb21 105j400v capacitors that are tested to meet the specified temperature ranges. If you're in the market for these capacitors, whether it's for a small DIY project or a large - scale industrial application, I'd love to help you out. I can provide you with detailed technical specifications, samples for testing, and competitive pricing.


If you have any questions about the minimum working temperature, or if you're interested in other aspects of Cbb21 105j400v capacitors, feel free to reach out. We can have a chat about your specific requirements and see how we can work together to ensure your project is a success. Whether you need a small quantity or a bulk order, I'm here to assist you. So, don't hesitate to contact me if you're looking to purchase these capacitors. Let's get your project up and running with the right components!
References
- Capacitor Technology Handbook
- Metalized Polypropylene Film Capacitor Manufacturer's Data Sheets

