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-   -   Difference between NE555 and LM555CN timer. (http://forum.allaboutcircuits.com/showthread.php?t=54774)

Lightfire 05-21-2011 03:03 PM

Difference between NE555 and LM555CN timer.
 
Hello,

I recently purchased a timer somewhere.:pI put in the paper (because I'm not the one who purhcased:D) 555 Timer (NE555). Is that correct? But they keeps giving me LM555 CN timer instead. Why? Are they the same?

THANKS!!!!

Kingsparks 05-21-2011 03:19 PM

Quote:

Originally Posted by Lightfire (Post 364349)
Hello,

I recently purchased a timer somewhere.:pI put in the paper (because I'm not the one who purhcased:D) 555 Timer (NE555). Is that correct? But they keeps giving me LM555 CN timer instead. Why? Are they the same?

THANKS!!!!

Yes, basically Different manufacturer. Google 555 Datasheet and it will give you all the information you need.

debjit625 05-21-2011 06:52 PM

Also low power versions of 555 are made like ICM7555.
Their is a dual version of 555 like 556 which have two timers and 558 is the quad version i.e it have four timers.

ErnieM 05-21-2011 08:01 PM

Quote:

Originally Posted by Lightfire
I recently purchased a timer somewhere.:pI put in the paper (because I'm not the one who purhcased:D) 555 Timer (NE555). Is that correct? But they keeps giving me LM555 CN timer instead. Why? Are they the same?

Sorry to say it is NOT correct.

Checking the NPX website (they bought Signetics) there are 8 different types of 555's available, and to make it clear to your purchasing department you should pick one complete part number (or several alternates) and not ask them to guess what criteria you left out of the part number you really just made up.

Also tell then what company that part number is from. Different companies can have the same part number for different parts, or different numbers for equivalent parts.

Parts can come in many different package styles you don't want people to guess which you intended.

Bill_Marsden 05-22-2011 01:09 AM

Quote:

Originally Posted by debjit625 (Post 364404)
Also low power versions of 555 are made like ICM7555.
Their is a dual version of 555 like 556 which have two timers and 558 is the quad version i.e it have four timers.

What you refer to as a low power 555 is not a 555. It is a CMOS 555, and has major, major differences in characteristics. It's drive is weak, it can go from 2VDC to 18VDC, and basically is just enough different from a classic 555 as to be considered a different part, as in many cases they are not interchangeable, mostly due to drive characteristics and the resistors used to set the 1/3 and 2/3 voltage points.

As with the 555, there are many companies making the CMOS 555, with different part numbers. Radio Shack sells the TLC555, the TI version of the chip. Due to minor variations in process the CMOS chips can have variations in performances and speeds, but mostly they are interchangeable with each other, just like a standard 555 is usually interchangeable between manufacturers.

The 558 is completely different altogether, and was only inspired by the 555. In no way is it a quad 555, unlike the 556, which has a 1 to 1 pinout corespondent and is a true dual 555.

To the OP:
As long as the part is a DIP style package you will be OK.

nbw 05-22-2011 07:30 AM

That's a good summary of my favourite IC there Bill!

nbw 05-22-2011 07:32 AM

1 Attachment(s)
"Like the sands through the hourglass, so are the 5-5-5s..." :D

Lightfire 05-22-2011 08:34 AM

Quote:

  • resistors: 470 4, 1k 2, 10k 8
  • capacitors: 0.1F 4, 1F radial
  • diodes: 1N4148 4
  • LEDs: 1 each red, green, yellow and blue, all 5mm diameter
  • 555 timer ICs (such as NE555) 4
  • DIL sockets for ICs: 8-pin 4
  • bleeper suitable for 9V
  • on/off switch
  • push switch 5
  • battery clip for 9V PP3
  • 2-core cable such as 'figure 8', about 8 metres
  • stripboard: 10 rows 50 holes

But as you may see on the "Parts Required" it said that it should be NE555. Now, I am worried that it might not work (the project will not work) if I will use LM555 instead. Or what? Help?

Thanks

Lightfire 05-22-2011 09:09 AM

1 Attachment(s)
Please take a look at my attached image if my time numberings was correct.

THANKS!

nbw 05-22-2011 10:34 AM

I'm sure you'd be fine using an LM555 in place of an NE555 - I have a mix of both in my toolbox. As Bill pointed out ICM7555s are a different kettle of fish.


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