This section provides overview, applications, and principles of current limiting diodes. Also, please take a look at the list of 2 current limiting diode manufacturers and their company rankings.
A current limiting diode is an electronic component that allows a constant current to flow when the voltage is within a specified range. It is sometimes called a "CRD" from the initial letters of another name it goes by, "current regulator diode." There are many electronic devices, such as LEDs, that require a constant current during operation. CRDs are used in such electronic devices.
Current limiting diode is generally used for relatively small currents, such as 1 mA to 15 mA, but there are also current limiting diodes capable of delivering large currents, such as 500 mA. However, care must be taken to avoid heat generation during operation and consequent damage to components.
Diodes are basic electronic components used in various electronic devices. Some electronic devices require a constant current to flow while being driven. For example, LEDs vary in luminance depending on the amount of current flowing through them, so the amount of current flowing through the circuit must be kept constant in order to stabilize the luminescence. Current limiting diodes are used in such current-driven electronic components and devices. Current limiting diodes are also used in battery charging/discharging circuits and leakage circuit breakers (earth leakage circuit breakers).
From 0 to a certain voltage, the current of current limiting diodes increases as the voltage increases. However, once the voltage enters a certain region, the current value becomes constant. The current value at this time is called "pinch-off current" and is one of the values that represent the characteristics of current limiting diodes.
The voltage at which 80% of the pinch-off current value is given is called the "shoulder voltage," and a voltage greater than the shoulder voltage must be applied to maintain a constant current. Note that, as shown in the above figure, even current limiting diodes are not a constant current diode when a large voltage is applied, and the current again increases with an increase in voltage.
Note that applying a voltage so large that it exceeds the constant-current range will damage the diode, so care must be taken when actually using the diode with respect to the size of the voltage.
Current limiting diodes can operate from voltages as low as 1 V to as high as 100 V. A variety of low-current diodes are available, including those with different pinch-off current magnitudes and those with reduced pinch-off current value fluctuations. Generally, constant current values of 1 mA to 15 mA are available. On the other hand, current limiting diodes for large currents are also sold, capable of delivering constant currents of 350 mA and 500 mA.
When using current limiting diodes, care must be taken to avoid heat generation during operation. Heat is generated according to the magnitude of the product of voltage and current, and in some cases, this can cause damage to the current limiting diodes. Also, when multiple current limiting diodes with different pinch-off current values are connected, the device may not operate as expected or may be damaged if the circuit is not properly configured.
There are many types of diodes. Here is a brief description of typical diodes other than current limiting diodes.
*Including some distributors, etc.
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