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The 1Nxxxx numbering system is an American standard (now adopted globally) used to mark semiconductor devices. The "1N" means that it is a single junction semiconductor device (i.e. a diode). "4001" is a number given to the smallest diode in the 400x series (4001, 4002, and so on) - the number indicates the voltage, current and power ratings of the diode. A transistor (which has 2 junctions) would be numbered 2Nxxxx. 1-single junction semiconductor device N-Silicon device 400-its a particular series whose max allowed current is 1A. x- it denotes the voltage rating. 1-50V,2-100V,3-200V... 7-1000V.

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Q: Why is the diode 1N4001 so called?
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