The Zener voltage of a Zener diode is affected by temperature changes. The Zener voltage of a diode is directly proportional to the temperature. This means that as the temperature increases, the Zener voltage also increases and as the temperature decreases, the Zener voltage decreases.
This relationship can be described by the Zener voltage temperature coefficient, which is a value that represents the change in Zener voltage per degree Celsius of temperature change. This value is typically specified in the diode's datasheet, and it can be used to calculate the expected change in Zener voltage at different temperatures.
For example, a Zener diode with a temperature coefficient of -2mV/°C will decrease its Zener voltage by 2mV for every degree Celsius increase in temperature.
It's important to keep in mind that Zener diodes are used in temperature sensitive applications such as voltage regulation, the temperature coefficient should be taken into account when designing the circuit to ensure the correct voltage is maintained. Additionally, the temperature coefficient can be used to compensate for temperature changes by adjusting the circuit accordingly.
In summary, the Zener voltage of a Zener diode changes with temperature. As the temperature increases, the Zener voltage also increases and as the temperature decreases, the Zener voltage decreases. The rate of change of the Zener voltage with temperature is given by the Zener voltage temperature coefficient, which is specified in the diode's datasheet.