Trying to locate proper SMD components for project

Discussion in 'General Electronics Chat' started by RogueRose, Jun 16, 2018.

  1. RogueRose

    Thread Starter Member

    Oct 10, 2014
    I have never worked with SMD items before and am a little confused about which items I need to order. For example a resistor marked R010 which was about 3.1mm x 6.2mm and is a 2512. Looking at charts I've seen this resistor listed as .5w, 1w and 2w so I have no idea what wattage is needed b/c not only do the charts list it as different wattages, the items for sale list different wattages.

    The items are for building an arduino centered home power monitor
    Here is a parts list for one unit but I'm going to need enough for 4-5 of them. The number on the left is the quantity needed for each unit.

    (6) 10u C-USC0805 C0805
    (8) 100 R-US_M0805 M0805
    (16) 10k R-US_M0805 M0805
    (1) 330u CPOL-USE3.5-8 E3,5-8
    (1) 2200u CPOL-USE5-13 E5-13
    (4) (Jumper pins??) PINHD-1X2 1X02
    LM2575 LM2575 TO263-5
    (1) (Jumper Pins??) PINHD-1X25MM_TERMINAL 5MM_TERMINAL
    330u L-US6000-XXX-RC 6000-XXXX-RC
    EI30-1 EI30-1 (transformer - 120v -> 5v)

    This device is supposed to convert 240 (or 120v) down to 5v for the arduino but I'm thinking I might skip that part and power it directly from a 5v (1.5a) charger which I would think would be sufficient.

    Can anyone help me figuring out what SMD parts I need?

    The first 5 are the ones I have questions about.
    10uf 0805 form? what voltage?
    100ohm resistor M0805 what wattage??
    10K ohm resistor M0805 what wattage?
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
    The nomenclature is terse and abbreviated in a way that suggests it's specific to a library such as Easy EDA uses. If you know the source, you can look for the long description there.

    You can make assumptions that resistors of a given package size will all have adequate wattage ratings for the circuit but it would be more prudent to make a determination based on an analysis of the schematic. The same principles apply to the voltage ratings for the capacitors.

    A 10μF electrolytic capacitor of that size is going to be tantalum but I couldn't tell you the voltage without looking it up. The 330μF and 2200μF capacitors are aluminum electrolytics.
    Last edited: Jun 17, 2018