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TVS – Diodes

TVS (Transient Voltage Suppressors) or Diodes are an important type of semiconductor device used to protect sensitive electronic components from voltage surges. They are used in a wide range of applications, such as automotive, medical, industrial, communication, computer peripherals, and power systems. A TVS diode is a three-layered structure consisting of an anode (electron-rich) layer, a Zener diode layer, and a cathode (electron-poor) layer.

SA7.5CHE3/54 Application Field

The SA7.5CHE3/54 is a silicon avalanche diode with low clamping voltage. It is well suited for use in a variety of applications such as automotive electronics, power supplies, load switches, power inverters, smart phone charging circuits, and other high-frequency or high-voltage pulsed circuits. It can also be used as a general-purpose clamping device to provide electrostatic discharge (ESD) protection.

SA7.5CHE3/54 Working Principle

The principle on which the SA7.5CHE3/54 works is simple but effective. In a normal circuit with unclamped voltage, the diode behaves like a resistor, so the instantaneous voltage across it is inversely proportional to the current flowing through it. During a surge or transient, the current drops to zero and the diode enters the avalanche breakdown region, limiting the voltage across the diode to a maximum specified clamping voltage. This effectively shunt-clamps the voltage, protecting any downstream components. The turn-off of the SA7.5CHE3/54 is also very fast, effectively limiting the clamping voltage within 1us of the transient start at a frequency up to 5000MHz.

Conclusion

TVS diodes are essential components that provide surge and ESD protection to sensitive electronic circuits. The SA7.5CHE3/54 is a silicon avalanche diode which is well suited for a wide variety of applications, and its fast turn-off time and low clamping voltage make it an ideal choice for protecting sensitive components from voltage transients and ESD.

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