Resistor Value on Circuit Diagrams Help

[Deltatango]

Getting confused these days having lived through days of wires looping over each other in a diagram, then just crossing over followed by stopping short of another when crossing over etc, as other countries got confused.

I am now confused with the latest resistor version of circuit diagram markings of a value...........

2E 4.7E etc is this a new circuit marking for OHM or Milliohm?

Is this taking over from 2R 4.7R or 4R7 or R47 etc.

Working on a power supply so I want to get it correct because (E in smd land) means 0000's to an value marking, so to see it used on a circuit diagram throws you off a bit.

Thank you for any help.......

David

 

[wwfeldman]

i think this article will help
look at the E96 section

SMD Resistor Codes & Markings: SMT Surface Mount » Electronics Notes

Surface mount resistors often have small codes on them to indicate their value - there are several different coding schemes that may be seen . . find out about the commonly used codes

www.electronics-notes.com

 

[Deltatango]

Yes I had read that in my search for an answer thank you, but that was not my question.

I am talking about a circuit diagram code:- 2M - 2K - 2R (OK so far) but 2E?? is what I want to understand about.

Possibly some new code to confuse us or make easier for Chinese to relate to as I know their component descriptions can be simplistic or even wacky.

Thank you from David

 

[wwfeldman]

try this

Markings on resistor | KOA Corporation

How to indicate resistance

www.koaglobal.com

the section on Product size indication of flat chip resistors toward the end.
apparently there is a size marking and a resistance marking.

2E 4.7E etc is this a new circuit marking for OHM or Milliohm?

so 2E and 4.7E are labels for a resistor on a schematic (i missed read that part)
per the KOA page above, 2E is a size indicator 1210 (inch code) or 3.2 mm by 2.6 mm
4.7E is a resistance value - 4.7 x 10,000, as E is listed as 10,000 in the table from post 2

my apologies if i'm still wrong

 

[Munyua44]

Getting confused these days having lived through days of wires looping over each other in a diagram, then just crossing over followed by stopping short of another when crossing over etc, as other countries got confused.

I am now confused with the latest resistor version of circuit diagram markings of a value...........

2E 4.7E etc is this a new circuit marking for OHM or Milliohm?

Is this taking over from 2R 4.7R or 4R7 or R47 etc.

Working on a power supply so I want to get it correct because (E in smd land) means 0000's to an value marking, so to see it used on a circuit diagram throws you off a bit.

Thank you for any help.......

David

E stands for Ohms for example 2E means 2 Ohms and 4.7 E means 4.7 Ohms.

 

[Deltatango]

Thank you all for your help I have read the link regarding smd and other resistor markings etc, I asked RS for their view below is the reply :-

Dear David.

Thank you for your recent enquiry.

For resistors E can be the same as Ω. It is often used in case of high power resistors (power not being less than 5W). Sometimes you can see R written instead of E.
We are however unable to determine the ohms or power rating of the required resistor form an E2 reference.

The only point I make on this reply is my part is an smd 08-12 type size so would not be a 5W+ rating

At this I accept that "E" = "R" on a circuit diagram, just like to find who started it and why? just one of my curio questions that one day I will learn, similar to the transistor symbol of many years standing based old ideas of electric current flow but oops got it wrong!!

Thanks from David