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Description: This is a very common signal diode - 1N4148. Use this for signals up to 200mA of current.

If you need a bunch of these, you can get good bulk discounts on Digikey, part # : 1N4148FS-ND

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Flyback Diode

This part is used in our SparkFun Inventor’s Kit as a flyback diode to prevent voltage spikes. For more information, try looking at some of the examples linked below that use this diode: