CZRF2V4B-HF

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Diodes are used in many different electronic circuits. In particular, the CZRF2V4B-HF is a single Zener diode designed for the purpose of voltage regulation. It combines excellent power capability, low leakage, and high reliability.

The CZRF2V4B-HF behaves like a normal diode in forward bias, allowing current to flow one way only. However, in reverse bias, when the applied voltage exceeds the Zener voltage (Vz), the diode acts as a voltage regulator, allowing the voltage across it to remain constant regardless of changes in the applied voltage in the anode-cathode direction.

The CZRF2V4B-HF single Zener diode has a Zener voltage (Vz) of 4V, a working current of 1A, and a maximum power dissipation of 0.5W. It is rated for a temperature of -55 to +150 °C for applications in low voltage battery powered circuits and energy efficient systems where a low Vz is necessary. It is also suitable for applications such as clamping, clipping, and over-voltage protection.

The working principle of the CZRF2V4B-HF, or of any Zener diode can be explained by referring to the band gap of the semiconductor material. When a reverse voltage is applied, it creates an electric field within the material which increases the energy of the electrons to a certain level, known as the Zener Level. At this level, they become ‘excited’, and can now leap across the forbidden band gap. As a result, a conductive pathway is created and current starts to flow, thus regulating the voltage across the diode.

The CZRF2V4B-HF single Zener diode is ideal for low voltage applications where a regulated power source is necessary. Its low power dissipation and high temperature rating make it particularly suited for small portable devices which require a low cost and reliable power source. It is also useful in other applications such as over-voltage clamping and voltage stabilization.

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