JAN1N4990D

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The JAN1N4990D is a single zener diode component which enables an electronics design to limit the peak voltage to a specific fixed value. Zener diodes are an analog component type usually used in electronics engineering applications to allow reverse voltage protection to a particular circuit. This diode can be used in various applications including AC/DC current sources and limits, active filter circuits, power supplies and logic level shifter circuits.

The working principle of the JAN1N4990D is that when the voltage across the diode exceeds the zener breakdown voltage, the current applied to the diode passes through to the negative side, known as the cathode. This prevents the device from reaching a higher voltage level, allowing voltage to be clamped to a certain level.

One application of this diode type is in overvoltage protection. Connecting a JAN1N4990D between two points in a circuit prevents voltage from increasing beyond the zener breakdown voltage, by passing the current in the opposite direction to the normal forward direction. This has the effect of limiting the peak of the voltage to that of the breakdown voltage.

The reverse voltage protection provided by the JAN1N4990D can also be used to protect integrated circuits from damage caused by having a higher voltage than they are designed to handle. Connected across the power and ground lines, the diode limits the reverse voltage so that these lines never exceed the breakdown voltage. In doing so, it provides the chip with the necessary protection needed.

The JAN1N4990D can also be used to create a voltage-controlled current source. When connected in series with a resistor and a current-sensing resistor, it will limit the voltage across the load to the zener breakdown voltage, allowing the output current to be controlled. This type of circuit is useful for controlling the current supplied to a device in accordance to its requirements.

The JAN1N4990D can also be used in the filtering application of high-frequency electromagnetic fields. When used in a filter, the diode is connected in reverse, creating a low-impedance path for high-frequency currents, which causes them to dissipate before they reach the equipment. This technique is used in many types of audio and RF circuits to reduce the amount of noise and interference.

The JAN1N4990D is a versatile single zener diode that can be used to protect a circuit from overvoltage and reverse voltage, control the output current of a source, and reduce the amount of electromagnetic interference. By understanding the working principle and applications of this diode, engineers can use it to create innovative solutions in many different areas.

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