DDZ9698Q-7

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The DDZ9698Q-7 are single junction Zener diodes with a broad range of applications and a very specific working principle. Zener diodes are a form of voltage-controlled rectifier or high-voltage diode that, in contrast to most diodes, operates in reverse bias mode where the anode is connected to the negative power supply and the cathode is connected to the positive power supply. The breakdown voltage (or zener voltage) of this specific device is 7 V.

The most common application of Zener diodes is to provide a specified and constant voltage output from an unstable voltage source. In a Zener-regulated circuit, the Zener diode is placed in series with a resistor, and the voltage it needs to regulate is applied across the combination. When the input voltage is greater than the breakdown voltage rating of the diode, the diode does not conduct and the output voltage remains constant, regardless of the voltage fluctuation.

For example, Zener diodes are often used in power supplies to stabilize the output voltage. In this case, the diode is placed in series with a current limiting resistor between the output and the rectified power supply. This way, the zener diode operates like a clamp that prevents the voltage on the output from exceeding its breakdown voltage rating. Another common application of Zener diodes is in voltage-sensitive circuits, where they can be used as a reference voltage to ensure that the output signal is within a specified range.

The DDZ9698Q-7 operate using a reverse avalanche breakdown mechanism, where the current suddenly surges when the voltage across the diode exceeds a certain value, due to the avalanche effect of the electrons that are multiplied within the diode junction. In this breakdown mode, the diode does not exhibit a sharp rectification and does not have a P-N junction. Instead, the current is limited by the series resistance and a negative exponential dependence occurs, with larger currents when the breakdown voltage is exceeded.

The Zener diodes also have a wide range of applications, such as providing overvoltage protection, providing a stable reference voltage for temperature sensors, ESD protection for sensitive circuits and more. They are also used in radio frequency circuits, as they provide a high-value impedance when their breakdown voltage is exceeded, allowing them to be used as impedance matching devices.

In conclusion, the DDZ9698Q-7 are commonly used single junction Zener diodes with a specified breakdown voltage of 7 V. They are used in many different applications due to their ability to regulate voltage, provide overvoltage protection, or act as an impedance matching device. Additionally, the DDZ9698Q-7 operate using the reverse avalanche breakdown mechanism, and exhibit a negative exponential relationship between the current and the breakdown voltage.

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