P4KE440-G Circuit Protection

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TVS (Transient Voltage Suppressor) diodes are important components in various power circuits, and the P4KE440-G is a representative product from one of the leading suppliers of TVS diodes in the world. This article is about the application field and working principle of the P4KE440-G.

The P4KE440-G TVS diode is an unidirectional device, designed to protect sensitive electronic equipment from electrical transients induced by lightning and other transient voltage events. It is applied in surge protectors, lightning-protected power supplies, industrial-grade protection circuits, automotive systems, and hybrid electric vehicles, to name a few of the applications. The P4KE440-G is especially suitable for applications where high surge capability is needed.

The P4KE440-G, a 400W 4.0V unidirectional TVS diode, is designed with low capacitance and high surge capability. It is ideal for board-level transient protection, suitable for connection with power ground planes. The P4KE440-G can efficiently protect electronic circuits from current surges up to 400 Watts. In order to provide effective transient protection, it has several important parameters that characterize its performance, such as maximum clamping voltage, peak pulse current, maximum power dissipation, and so on.

The P4KE440-G is a silicon-based TVS diode with a working voltage up to 4.0V. Its peak pulse power dissipation is 400W, and peak pulse current is 8.3A. The maximum clamping voltage (VC) is typically 23.4V, which ensures reduced stress on the protected circuits. The device is fast enough to respond even to fast transients (tP <= 8.3ns). The P4KE440- G\'s ultra-low capacitance (Cd) is 0.07pF. The TVS diode is also rated at a typical operating temperature range of -55 °C to +150 °C.

The P4KE440-G works under the principle of avalanche breakdown. When the applied voltage exceeds the diode\'s breakdown voltage, the diode starts to conduct electric current in the forward direction, and the current shoots up to a high level. In this way, the surge of current is limited by the TVS diode, hence protecting the electronic devices from the voltage transients. The voltage across the diode follows the diode\'s breakdown curve, and reaches a steady state value just after the transient.

In summary, the P4KE440-G is an excellent unidirectional 400W silicon TVS diode used in a wide range of high-power surge protection applications. Its low capacitance and high surge capability makes it a suitable device for a wide variety of applications in the field of transient protection. Its physical properties and avalanche breakdown working principle combine to offer reliable and efficient protection from voltage transients.

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