need help with a seven segment display datasheet

Discussion in 'Electronics Resources' started by Mike C, Feb 13, 2015.

  1. Mike C

    Thread Starter New Member

    Feb 11, 2015
    So I am trying to understand the datasheet for this seven segment display:

    I have an LSD3211

    On page 3 it states the forward current per chip for red is
    40, 40 and 15 for SR, R and H respectively.

    What do the SR, R and H stand for and what is the current level I should be targeting for this chip? 40 or 15 mA? I'm guessing 15 since 40mA seems awfully high for an led.
  2. WBahn


    Mar 31, 2012
    I'm guessing that the SR, R, and H are three different variants on the part (probably what the -XX in the part number is).

    Note that these are not the normal operating currents, but the absolute maximum currents that can be tolerated. Also, note that most of these are on a "per chip" basis. I'm pretty sure that this means per segment (each segment is a different LED chip).

    You might go to the manufacturers website and submit a query if you can't find the information on their website.
  3. jamesd168

    New Member

    Nov 8, 2014
    check the product description itself, this is what i found:

    Typical forward current: 20mA
  4. Mike C

    Thread Starter New Member

    Feb 11, 2015
    ah yes stupid me. I guess it would be the 40mA max then.