1N4148UB

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Diodes - Rectifiers - Single

The 1N4148UB is a high-speed switching diode commonly used for input protection circuits, clipper circuits and for general switching applications requiring a low forward voltage. It has a low leakage current and a high current handling capability. As such, it is used as a switching diode to allow or deny current flow in a particular direction. The maximum forward current is 200mA and it has a peak repetitive reverse voltage of 75V.

A diode is a two-terminal electronic component that has the same structure as an ordinary PN junction diode, but is made using an additional "UB" layer. This layer improves the conduction of electrons, and allows the diode to switch faster than an ordinary PN junction. It also has a longer life, since the additional "UB" layer increases the amount of electrons that are able to quickly pass through the diode.

Application Field

The 1N4148UB is mainly used as a general-purpose switching diode in applications such as high frequency switches, clamps, rectifiers, and in LED driver circuits. It can also be used for input protection for logic signals, for level shifters, for voltage drop and clamping devices, for single supply logic switching, and for analog switches.

In a digital device, the 1N4148UB acts as a gate, allowing the current to flow in one direction and blocking the current in the opposite direction. Its fast switching speed ensures that the circuit will not be overloaded and that the device is not damaged. In LED driver circuits, it enables the LED to light up at a steady brightness.

The 1N4148UB can also be used to block high frequency signals, by using the diode in a "clamp" circuit. The diode is typically connected in series with a capacitor, which is usually charged up to the desired voltage. The diode is then "clamped" across the two plates of the capacitor to ensure that the high frequency signals are blocked from entering or leaving the circuit.

Working Principle

When conducting, the diode allows current to flow in only one direction. This is known as the "forward" direction. In the forward direction, the diode acts like a short circuit, allowing the current to pass with minimal resistance. In the reverse direction, the diode acts like an open circuit, preventing current from flowing and blocking the voltage from passing across it.

When there is a forward bias applied to the 1N4148UB, it will conduct, and the voltage across the diode will be relatively low, with a maximum forward voltage of 1V. The current passing through the diode is determined by the resistance in the circuit, and the amount of current that is allowed to pass through the diode depends on its current handling capability. When there is a reverse bias applied to the diode, the voltage across it will be much higher, and the current passing through the diode will be significantly reduced.

The 1N4148UB has a maximum peak repetitive reverse voltage of 75V, which means that the voltage across the diode can reach up to 75V when the current is reversing direction. This allows the diode to be used in a wide range of applications.

In addition, the diode has a low leakage current, meaning that a small amount of current is able to leak through the diode when it is in the reverse bias mode. This is important for applications where a very low amount of current leakage is needed.

The 1N4148UB is an effective diode for a variety of applications due to its high current handling capability, fast switching speed, and low leakage current. It can be used as a general-purpose switching diode, as an input protection diode, and as a diode for LED driver circuits.

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