S20F

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S20F application field and working principle

The S20F is a single-layer three-terminal ultra-miniature surface mount device designed for protection against power surge and ESD in a wide range of electronic products. It is a rectifier comprising of a symmetrically configured silicone diode and an NTC thermistor that restrain inrush current. The combination of these two components provides excellent protection against power surge, ESD, and overvoltage.

The symmetrical construction of the rectifier provides an even, uniform current rating and reliable protection. S20F also offers high temperature stability, low power dissipation, and low capacitance. Furthermore, the S20F can be used in applications where space is limited, such as low-profile wireless products, providing reliable, low-profile protection.

Application field

The S20F is primarily used in applications requiring efficient power surge and ESD protection. It can be used in the telecommunications, video and audio, automotive and defense industries, as well as in embedded systems, power supplies, and embedded systems. It can also be used to protect sensitive circuits in microelectronic, LED/ LED drivers, medical, home appliance, and handheld device applications.

Working principle

The S20F\'s mechanism of protecting against power surge and ESD is based on the combination of its symmetrical silicon diode and an integrated NTC thermistor. Specifically, the diode prevents current flowing in the reverse direction; meanwhile, the NTC thermistor absorbs the impact of initial inrush current, limiting it to a much lower current level. This ensures reliable protection of sensitive circuits and components.

Initially, the S20F is constructed with the symmetrical silicon diode in reverse direction, so no current flows in either direction. When an excessive inrush current or an ESD transient event occurs, the diode is forward biased, so current flows in the forward direction. At the same time, the NTC thermistor absorbs the transient current and dissipates it in the form of heat, limiting the current to a minimum level. This heat dissipated by the NTC thermistor is then conducted away from the components.

The S20F is designed such that it can be used in various applications where space is limited. It is ideal for use in embedded systems, LED drivers, automotive systems, power supplies, and other high-performance applications due to its high temperature stability. It also low power dissipation and low capacitance ensures reliable protection.

Conclusion

The S20F is an ideal choice for applications requiring efficient power surge and ESD protection. Its two-component rectifying mechanism provides excellent protection against transients, while its high temperature stability, low power dissipation, and low capacitance make it suitable for use in a variety of applications.

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