Is LM4732 simplified version of LM4780?

ozonek · 25th June 2006, 12:54 PM

I just wonder if LM4732 from NS is the simplified version of LM4780?

I ask this because I know in the IC industry, it is common practice to bin the raw material after test according to the performance of each unit. I wonder LM4732 and LM4780 have the same die and the only difference is LM4732 just has some defective circuitry/ transistor but it still can work.

ozonek · 26th June 2006, 02:51 PM

folks, any idea?

pinkmouse · 26th June 2006, 02:52 PM

I suspect that this is a question you need to direct to National's tech support.

lgreen · 26th June 2006, 02:54 PM

In other words, it just might be.

glennb · 27th June 2006, 11:21 AM

Quote:

Originally posted by ozonek
I just wonder if LM4732 from NS is the simplified version of LM4780?
I ask this because I know in the IC industry, it is common practice to bin the raw material after test according to the performance of each unit. I wonder LM4732 and LM4780 have the same die and the only difference is LM4732 just has some defective circuitry/ transistor but it still can work.

Given that the LM4732 has the same pinout as the LM4780 (implying the internal chip layout is similar, being two LMP3886AT silicon dice), and the specs are almost identical except for the output power, these is a good chance the LM4732 is just a LM4780 which failed the LM4780 test specs.

I compare LM4780, 3886, 3875, 1875 on my web pages at
http://home.pacific.net.au/~gnb/audio/lmcomp.html

ozonek · 27th June 2006, 01:20 PM

What's more, LM4732 (2x50W) is slightly more expensive than LM4780 (2x60W)

RDV · 27th June 2006, 09:16 PM

Perhaps two 3875s?

RDV

ir · 28th June 2006, 06:56 AM

the 4732 was released several months prior to the 4780. i know this for certain as i when i sampled a couple of 4732's they were the highest power output devices National offered.

that would got to say then that the 4732 is not a simplfied 4780 or 4780 reject. well, not initially at least.

ozonek · 28th June 2006, 09:19 AM

I also highly suspect that LM4732 is 2xLM3875.

25th June 2006, 12:54 PM	#1
ozonek diyAudio Member Join Date: Jun 2006	Is LM4732 simplified version of LM4780? I just wonder if LM4732 from NS is the simplified version of LM4780? I ask this because I know in the IC industry, it is common practice to bin the raw material after test according to the performance of each unit. I wonder LM4732 and LM4780 have the same die and the only difference is LM4732 just has some defective circuitry/ transistor but it still can work.

26th June 2006, 02:52 PM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I suspect that this is a question you need to direct to National's tech support. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

26th June 2006, 02:54 PM	#4
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	In other words, it just might be. __________________ Retired from DIY (2010) but still lurking now and again. My DIY audio projects- PartTimeProjects.com.

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26th June 2006, 02:51 PM	#2
ozonek diyAudio Member Join Date: Jun 2006	folks, any idea?

27th June 2006, 01:20 PM	#6
ozonek diyAudio Member Join Date: Jun 2006	What's more, LM4732 (2x50W) is slightly more expensive than LM4780 (2x60W)

27th June 2006, 09:16 PM	#7
RDV diyAudio Member Join Date: Sep 2005	Perhaps two 3875s? RDV

28th June 2006, 06:56 AM	#8
ir diyAudio Member Join Date: Aug 2003 Location: WGTN, NZ	the 4732 was released several months prior to the 4780. i know this for certain as i when i sampled a couple of 4732's they were the highest power output devices National offered. that would got to say then that the 4732 is not a simplfied 4780 or 4780 reject. well, not initially at least.

28th June 2006, 09:19 AM	#9
ozonek diyAudio Member Join Date: Jun 2006	I also highly suspect that LM4732 is 2xLM3875.

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