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I am designing a power supply card using V7805-2000 for 12V to 5V conversion. In the datasheet on page number 6 they have a recommended input filter and output filter circuit. For the inductor they have mentioned value between 10uH to 47uH.

The input to the V7805 will be 12V@2A. I used 0805 footprint for the inductor in input and output path.

I am unable to find the part number for matching the recommended value(10uH to 47uH) in 0805 package at the input and output current rates of 2A. I want to use an inductor current rated twice the needed current rating to be on the safer side.

What happens if I use this Inductor in both input and output path?

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  • \$\begingroup\$ If you absolutely have to use 0805 pads, you might be able to get this inductor to fit:digikey.com/en/products/detail/murata-electronics/… \$\endgroup\$
    – sbell
    Oct 9 '20 at 14:25
  • \$\begingroup\$ Isn't an 0805 footprint a bit small for what you need ? Why do you even need the inductors anyway ? \$\endgroup\$ Oct 9 '20 at 20:22
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What happens if I use this Inductor in both input and output path?

The inductor you linked is 0.47 uH so, it will be ineffective as a filter but have no problems with the operating current.

I am unable to find the part number for matching the recommended value(10uH to 47uH) in 0805 package at the input and output current rates of 2A.

Yes, that doesn't surprise me - you'll have to choose a bigger package.

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  • \$\begingroup\$ I am replacing 0805 footprint with this inductor:- digikey.com/en/products/detail/w%C3%BCrth-elektronik/… \$\endgroup\$ Oct 12 '20 at 10:19
  • \$\begingroup\$ Be aware that if you are hoping it will work above 12 MHz, this won't happen because its self resonant frequency is 12 MHz at which it turns into a high impedance (a good thing) but, as frequency increases, it turns into a capacitor. Probably OK for most applications though. \$\endgroup\$
    – Andy aka
    Oct 12 '20 at 10:26
  • \$\begingroup\$ I will keep that in mind! \$\endgroup\$ Oct 12 '20 at 12:23

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