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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

Documents: Datasheet

Comments 8 comments

  • 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.

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

  • I’ve been following this tutorial (http://www.youtube.com/watch?v=2q59Kqw4gaM&feature=plcp) 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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