need help with a seven segment display datasheet

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Mike C

Joined Feb 11, 2015
6
So I am trying to understand the datasheet for this seven segment display:

http://www.jameco.com/Jameco/Products/ProdDS/24740.pdf

I have an LSD3211
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?search_type=jamecoall&catalogId=10001&freeText=24740&langId=-1&productId=24740&storeId=10001&ddkey=http:StoreCatalogDrillDownView

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.
 

WBahn

Joined Mar 31, 2012
25,760
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.
 
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