LME49720 Vs LM4562.... - Page 2 - diyAudio
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Old 9th February 2008, 10:32 PM   #11
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Quote:
Originally posted by drdagor
Digikey apparently knows that the LM4562 and the LME49720 are the same part. They don't stock both. They have the LME49710 and 40, but they have the dual listed only as the LM4562.
Eh? All packages of both LM4562 and LME49720 are stocked at DK.
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Old 12th February 2008, 01:58 AM   #12
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I actually e-mail the tech people at National. They said yes, the only difference is the number stamped on the outside.

BT
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Old 12th February 2008, 02:32 AM   #13
dweekie is offline dweekie  United States
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Everyone says the chips are the same. I swapped between the two in a dip socket before I knew they were the same part, and they didn't sound completely identical. There was also another person on a different forum that said they sounded different as well. The 49720 just sounded a bit warmer. Maybe it's a sample variation or the 49720 needed breaking in. I'll just leave it at that. I didn't look into it any further.
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Old 4th April 2008, 04:30 AM   #14
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Quote:
Originally posted by SpittinLLama
National uses an additional 'E' in the name (LMExxxxx) to indicate their new high performance audio products. Perhaps the LM4562 came out before the change so they made a new part number to indicate high end part. There is a whole family of LME parts of op. amps and drivers yet only the LM4562 and LM4702 that are not part of these families. These were the first two parts out that could be called high end.

Go figure.

-SL

"E" stands for enhanced according to a National person. "P" for precision. I can confirm what spottande Laman says. It's marketing and yes, the same chip. This is not the first time. Compare TPA6120a and THS6012. Analog Devices has also identical chips.
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Old 1st July 2008, 02:04 PM   #15
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I try in the same conditions LME49860 and LM4562. The sound is very different between them.LM4562 is more punch, dynamic sound and it could oscilate very easy, you must be carrefully with it, LME49860 it has a more warmer sound, sweety treble, but the midrange just a little in the back of stage and the bass is more soft, not too good. At first session LME49860 it is a more atractive , but after I compensated the LM4562 that has a excellent sound, much more dinamyc. It is a difference between them on suply rail ?sound like LME49860 have a series resistance on the suply rails.... maybe from here is the difference from 17V to 22V
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Old 1st July 2008, 07:09 PM   #16
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It is the same chip but the 17 and 22 V difference may be explained by testing and selection.
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Old 1st July 2008, 08:36 PM   #17
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Quote:
Originally posted by dweekie
Everyone says the chips are the same. I swapped between the two in a dip socket before I knew they were the same part, and they didn't sound completely identical. There was also another person on a different forum that said they sounded different as well. The 49720 just sounded a bit warmer. Maybe it's a sample variation or the 49720 needed breaking in. I'll just leave it at that. I didn't look into it any further.

Well, this isn't a fair comparison between the two chips, as there is a very good reason I'm hearing a minor difference between the two, with the LME49720 being slightly better.

The small batch of LME49720 chips I bought are in the metal can (TO-99). I'm sure the extra mass and shielding are the main factors, but maybe someday I'll get a hold of some LM4562 in the TO-99 case to compare apples-to-apples.

Either way, I don't think you can go wrong with either chip.

BT
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Old 25th April 2013, 04:28 AM   #18
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Quote:
Originally Posted by SpittinLLama View Post
National uses an additional 'E' in the name (LMExxxxx) to indicate their new high performance audio products. Perhaps the LM4562 came out before the change so they made a new part number to indicate high end part. There is a whole family of LME parts of op. amps and drivers yet only the LM4562 and LM4702 that are not part of these families. These were the first two parts out that could be called high end.

Go figure.

-SL
I was the Product Manager for the LM4702 and LM4562. The audio department changed the naming convention after the LM4562 and LM4702. Two other versions of the LM4562 were spun: the single and quad. It was a long time ago, but I think they are all different dies.
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Old 19th September 2013, 01:04 PM   #19
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These two opamps not only sound completely different, but the 4562 is MUCH more sensitive to grounding. You can run an LME49720 just about anywhere, while a 4562 in the same socket will sound like crap (and probably oscillate). In a proper circuit the 4562 will SING - it has way more punch and dynamics then the 49720.
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Old 20th September 2013, 10:43 AM   #20
KSTR is offline KSTR  Germany
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We have a statement here from an original product manager at National that reads the parts are 100% identical, it is the exact same silicon :
National opamp inflation

If anyone perceive different sound it's either normal part-to-part variation or just simply confirmation bias, I would dare say.
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