SFA37S10K288B

Film Capacitors

Film capacitors are a type of capacitor that makes use of a polyethylene film as a dielectric, which has low loss through an extremely wide frequency range allowing for their use with both high frequency and low frequency signals. The two most common types used in electronics are polyester and polypropylene types. Polyester capacitors are used in signal processing, power conditioning and general audio applications while polypropylene types are commonly used in power supplies, active filters and coupling capacitors.

SFA37S10K288B application field and working principle

The SFA37S10K288B is a film capacitor designed for use in high frequency applications such as switch-mode power supplies, high frequency switching converters, LED lighting, and motor drives. The SFA37S10K288B is a general-purpose capacitor, offering an operating temperature range of - 40°C to +125°C.

The main features of the SFA37S10K288B include a low ESR (equivalent series resistance) enabling higher ripple current capacities compared to other film capacitors, and an excellent self-healing feature, which allows the capacitor to adequately protect the system against any sudden surges. Additionally, the SFA37S10K288B has a typical capacitance value of 10,000pF, a rated voltage of 280 VAC, and a capacitance range of 1-10nF.

The SFA37S10K288B works on the principle of dielectric absorption, wherein the capacitance is stored in the capacitance dielectric, and the electrons are absorbed and stored in the dielectric layer. This provides the capacitor with the ability to store an electrostatic charge, which is then transferred when a voltage is applied across the terminals. As the voltage increases, the stored electrons are released and the capacitance value decreases.

The high dielectric absorption of the SFA37S10K288B allows it to handle large transients with very little voltage reduction, providing an effective and reliable energy storage for high transient applications. Moreover, the SFA37S10K288B has a low ESR, which allows higher ripple current capacities compared to other film capacitors.

In conclusion, film capacitors, such as the SFA37S10K288B, offer a reliable and cost effective solution for high frequency applications, with their low ESR enabling higher ripple current capacities and a wide operating temperature range. With its excellent self-healing feature, the SFA37S10K288B can adequately protect the system against sudden surges, making it a reliable and effective energy storage device.