20KPA172-B Circuit Protection

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Transient Voltage Suppressors (TVS) diodes are common components found in electronic devices to provide transient voltage protection. The 20KPA172-B is a surface mount TVS diode, designed to protect components from overvoltage transients above a predetermined voltage limit. These low capacitance diode devices are designed for data line protection in communication and computer systems, and are capable of features such as bidirectional operation, high peak pulse current for maximum protection, and low capacitance for flawless signal integrity.

The 20KPA172-B has a peak pulse power rating of 20KW, and can sustain a required breakdown voltage of 12.7 volts with a typical clamp voltage of 15 volts. It is a unidirectional device designed to provide ESD protection for data lines from 7.5 volts to 24 volts, and is RoHS compliant, meaning it is free from hazardous substances. The applications of the device range from automotive components to consumer and commercial electronics, and its bidirectional protection feature proves especially useful for general purpose devices.

The 20KPA172-B operates by exploiting the benefit of a breakdown voltage of the diode. When an excessive transient voltage is applied to the diode, the depletion region formed by the junction of the p-type and n-type materials of the diode, becomes increasingly thin, leading to the breakdown of electrons and flow of current along the p-n junction. The diode then undergoes avalanche breakdown, a kind of rapid current flow, and the current is diverted away from the device being protected.

The diode device comprises of a NPN pair of transistors connected in a Darlington configuration. The voltage at the junction of the two transistors is referred to as the diode trip point voltage. When the voltage at the junction is greater than the trip point voltage, breakdown of electrons occurs and current starts flowing through the NPN pair. The voltage then falls to the trip point voltage accompanied by a slight power loss. The 20KPA172-B is designed to sustain a relatively high temperature of 125°C with power dissipation up to 1W.

The 20KPA172-B offers an inherent barrier to reduce capacitive coupling between multiple devices, and can operate as an overcurrent protection device. It is designed with overcurrent and overvoltage protection, making it a versatile choice for a variety of applications. The device features symmetrical V-I characteristics, low power losses due to low forward conduction voltage drop, and reverse leakage current. It also has a low load capacitance of 66pF to minimize signal distortion, and can act as a load switch.

Surface mount components like the 20KPA172-B TVS diode offer a simple, efficient and dependable solution to protect components from excessive transients. TVS diodes like the 20KPA172-B are key components of various consumer and automotive applications, as these devices provide reliable protection and support applications requiring many levels of circuit protection. With the help of the 20KPA172-B, circuit designers are able to protect their circuits from overvoltage transients without affecting their component performance.

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