1N2975RB

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The 1N2975RB Zener diode is part of a family of single Zener diodes designed to provide voltage regulation and protection against overvoltage situations. Zener diodes are two terminal components that possess a limit to the reverse breakdown voltage and operate as a constant-voltage source if the breakdown voltage is higher than the anode voltage. There are three main application areas where 1N2975RB Zener diodes are typically used:

1. Voltage Regulation

In voltage regulation applications the 1N2975RB Zener diode is connected in series with a load and the reverse breakdown voltage is set to be higher than the load’s voltage requirement. This allows a constant voltage as the load’s current changes, therefore providing an effective short-term voltage regulation.

2. Overvoltage protection

The 1N2975RB Zener diode is also connected in series with the power supply and protects the load from any overvoltage or surges. Its reverse breakdown voltage acts as a “clamping voltage” to protect the load from any high voltage spikes. This is a very helpful feature in applications that require a constant voltage source without any chances of sudden and high voltage jumps.

3. Clipping circuits

The 1N2975RB Zener diode can also be used in clipping circuits. In these applications, a Zener diode is connected in parallel with a load in such a manner that when the voltage surpasses a certain predefined threshold, the Zener will conduct and the circuit’s output will be clamped to the Zener’s breakdown voltage. This allows for increased safety when handling higher voltage applications.

Working Principle

The 1N2975RB Zener diode has a reverse breakdown voltage of 5.6V, meaning that when the anode voltage surpasses this value the reverse current begins to increase quickly due to a phenomenon known as avalanche breakdown. In this case, the Zener’s behavior is similar to that of an ordinary rectifier diode due to its low impedance when the anode voltage is higher than its reverse breakdown voltage.

When the anode voltage is lower than its reverse breakdown voltage, the 1N2975RB Zener diode behaves as an open circuit without any current flowing through it. This allows it to act as a regulator when used in voltage regulation applications and as a clamp during overvoltage protection.

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