SA14HE3/73

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Transient voltage suppressor (TVS) diodes are primarily used for circuit protection, typically against energy spikes found in automotive or industrial applications. One of the commonly used TVS diode is the SA14HE3/73, which is an avalanche diode with a 12 Vdc, 1.2 W power rating. It is designed for a peak pulse power of 350 W (10/1000 μs) and a 10A unidirectional peak pulse current, making it suitable for telecommunication applications.

The SA14HE3/73 is designed to be highly reliable and to protect against back-to-back lightning strikes, electrostatic discharge, and other dangerous voltage and energy spikes. It has two-lead axial and surface mount packages, making it highly compatible with a variety of circuits, and its excellent clamping capability works by diverting a surge away from sensitive components.

The working principle of the SA14HE3/73 is quite simple: When the surge voltage is applied across the anode and cathode of the diode, the medium-sized power breakdown voltage is exceeded. The diode then undergoes avalanche breakdown, which is a phenomenon where electrons are accelerated in a potential field such that they gain energy from the field and free other electrons by collision once they have enough energy. This avalanche effect creates a high number of electron-hole pairs which further amplifies the breakdown effect. This breakdown has two effects: first, it clamps the voltage across the diode and second, it creates a low resistance path between the anode and cathode. The low resistance path enables the surge current to be diverted away from the main circuit.

The SA14HE3/73 TVS diode has a wide range of application fields, including automotive, communications, industrial, and military. In automotive applications, the diode is used to prevent electrical system damage due to electrostatic discharges and power surges, as well as to protect circuits from circulating surges. In communications and military applications, the diode can provide protection from ESD and lightning strikes, which can cause serious damage to sensitive electronics. In industrial applications, the diode can be deployed to protect pumps, motors, and other electronics from power surges, as well as to protect from environmental conditions such as humidity and moisture.

The SA14HE3/73 is a reliable and effective solution for protecting circuits from surges, ESD, and lightning strikes. Its wide range of application fields, compatibility with a variety of circuits, excellent clamping capability, and simple working principle make it an ideal choice for circuit protection in a range of applications.

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