I have a 1N4148 diode. I can not find which is the anode and cathode from datasheet.
Does anyone know where is the anode and cathode of this diode are?
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Strange indeed that Diodes Incorporated datasheet does not contain the words "cathode" or "anode". Conventionally the cathode(-) side of the device is marked with a bar. So in your figure, it's the left end of the device. The "JP" and "YM" may be replaced with other letters or numerals, but the vertical bar stands for an actual vertical bar marked on the package.
Another data sheet for the 1N4148WSF states "Color band denotes cathode"