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what is a pn junction diode
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P-N Junction Diode:

Diodes allow electricity to flow in only one direction. It is the electrical version of valves.

 1N4148

The 1N4148 are high-speed switching diodes fabricated in planar technology, and encapsulated in hermetically sealed leaded glass SOD27 (DO-35) packages.

Specification:

Vrpm=100V (Max. repetitive reverse voltage)

Io=200mA (Avg. rectified forward current)

If=300mA (DC forward current)

Pd=500mW (Power dissipation)

Tpr<4ns (Reverse recovery time)

The 1N4148 is a signal diode, good for low voltage and low current applications.

Application:

 

•High-speed switching