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Description: This is a simple, very common rectifier diode. Often used for reverse voltage protection, the 1N4001 is a staple for many power, DC to DC step up, and breadboard projects. 1N4001 is rated for up to 1A/50V.

If you need a bunch of these, you can get good bulk discounts on Digikey, part # : 1N4001-TPMSCT-ND


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Customer Comments

  • Switching speed??

  • I often wonder why anyone buys 1N4001’s anymore. Buying in bulk, you can get 1N4001’s for $0.09 each. 1N4007’s with the same current rating but a 1000V breakdown are $0.11 each.

  • Stupid question: If it can handle 1A at 50 V, will it be able to take a greater amperage at a lower voltage (say, 2A at 12V)?
    (edit: fixed typo)

    • No, it is not a power or watt rating, but 2 separate ratings. Voltage and amperage. The amperage limitation is typically heat based, where the voltage is a “breakdown voltage” - This is the point where the normally non-conductive material the diode is made of becomes conductive.

    • More specifically, the 1A is the forward biased current rating, and the 50V is reverse bias breakdown voltage.

  • Or less.
    Digikey lists them at exactly the same price for most of the manufacturers. Prices/100:
    Diodes, Inc: $8.50/$8.50
    Micro Commer: $8.50/$8.50
    Fairchild: $9.00/$9.70
    ON: $10.96/$10.96
    Vishay: $13.39/$13.39
    I thought the capacitance ratings might be different, but the datasheets say no.

    • Uhh, I’m not seeing any though hole 1N4007s on Digikey that a cheaper than $0.11 (that you can buy in quantities as low as 100). There are several that you can get 1000/~$80 … but that’s a bit much for me. ;)

      Edit: Ahh, I misspoke. When you buy that one in a package of 100, it becomes $0.0649/part – or $6.49/100. Nice.

  • I always wasn’t sure how this diode is working. To all of you that are still unsure here is good explanation about rectifier diode.

  • Anybody know what the voltage drop across this might be? About .7v?

    • At 1A more like 1V, which people often ignore, having the 0.7V stuck in their minds. The datasheet should give you a V-A graph.

  • I’ve been following this tutorial ( for using relays with a microcontroller, and it mentions using a diode to prevent the microcontroller from getting fried. Will this diode work for that purpose?

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Support Tips

Flyback Diodes

These are good for flyback diodes on things like relays and solenoids. Here’s a good tutorial that explains how this works. They keep you from killing your transistor or MOSFET.

Wikipedia has a more technical description here => .