MMBZ4685-HE3-18

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A zener diode operates as a voltage stabilising device. It allows current to flow in either direction when the voltage applied to it is below the zener voltage or breakdown voltage of the zener diode. When the zener voltage is exceeded, the zener diode then breaks down and clamps the voltage across it at a chosen level.

The MMBZ4685-HE3-18 is a type of Zener diode, classified as a single diode. This component is most commonly used to protect circuits from overvoltage, it does this by limiting the voltage applied to the circuit to a predetermined voltage by diverting the excess current. This component is also often used in voltage regulators, as it allows the supply voltage to be clamped to a specific value. The MMBZ series also offer high power dissipation and low noise operation, making them suitable for a variety of applications.

The MMBZ4685-HE3-18 has a power dissipation of 300mW, with an operating temperature ranging from -65°C to +175°C. In terms of dimensions this component has dimensions of 4.0 x 1.6 x 1.0 mm, with its peak forward surge current being 300mA. Also this component has a maximum reverse voltage of 17 V and the breakdown voltage is between 15.6-17V. The maximum leakage current ranges from 50uA to 250uA.

In terms of its application field, the MMBZ4685-HE3-18 is typically used for protecting circuits from overvoltage and for voltage regulation. It is also used in systems where the voltage needs to be stabilized in order to reduce interference. This component has a wide range of applications, including automotive, computer, telecommunications, and consumer electronics.

The working principle of this component is based on the Joule heating effect. During the operation of the diode, an electric current passes through the diode, which causes the internal temperature of the diode to rise as a result of Joule heating. This rise in temperature causes the electrons in the diode to become more mobile, resulting in a higher reverse current. This reverse current then increases the breakdown voltage of the diode and therefore clamps the applied voltage to the breakdown voltage. As the temperature of the diode rises, the voltage clamping effect of the diode will increase correspondingly. This attempt to regulate voltage is referred to as a Zener breakdown.

In conclusion, the MMBZ4685-HE3-18 is a Zener diode classified as a single diode. It is most commonly used for protecting circuits from overvoltage and for voltage stabilization. This component has a power dissipation of 300mW, with an operating temperature ranging from -65°C to +175°C, and dimensions of 4.0 x 1.6 x 1.0 mm. The working principle of this component is based on the Joule heating effect, which causes the internal temperature of the diode to rise and results in a higher reverse current, causing the voltage applied to the diode to be clamped to its particular breakdown voltage. This component has a wide range of applications, including automotive, computer, telecommunications, and consumer electronics.

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