Choose a Right Capacitor
It is not easy for you to choose the right capacitor every time for your PCB boards, especially for many beginners. Today, we will discuss two most common capacitor types: polarized capacitor and non-polarized capacitor.
Polarized capacitors: If you need a polarized capacitor, you need something called an “electrolytic” capacitor. There are two types of electrolytic capacitors: aluminum and tantalum. Aluminum capacitors are more common and much cheaper than tantalum capacitors. Aluminum caps usually come as through-hole components. Choose aluminum caps unless you have any special requirements. For example, if you need a smaller and more durable capacitor, then choose the tantalum type is your best choice. Tantalum caps are available in small surface mount packages. They can work in a wide temperature range.
Non-polarized capacitors: If you need a non-polarized capacitor, a ceramic or a film capacitor is the most common one. Ceramic caps are small and cheap. It’s the most common choice for non-polarized capacitors. They are often used as decoupling capacitors. If you have any special requirements like low tolerance, high reliability or a capacitor that is able to operate under high temperatures, then choose a film capacitor. It is much better for this.