Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

Difference between same chips ?
Difference between same chips ?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th February 2012, 08:10 AM   #1
menjic is offline menjic
diyAudio Member
Join Date: Jan 2011
Default Difference between same chips ?

I am relatively new to all this and relatively bad in writing English and I hope you will understand my question.

Maybe I ask too much but can not find anything on this topic, and can not stop asking my self if they are all identical why they are labeled different, or in another words can 2 factories produce identical chips ?

For example, is there any difference among these :

Chip 1. LM4870 JM34ES
Chip 2. LM4870 PM65RA
Chip 3. LM4870 PM35AK

There must be some kind of tolerance % in manufacturing process ?

In data sheet : IF military or aerospace specified devices are required please contact for availability and specification ???

What is military spec LM4870 ?
  Reply With Quote
Old 6th February 2012, 08:53 AM   #2
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
abraxalito's Avatar
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Send a message via Yahoo to abraxalito
Yes, there are manufacturing tolerances and those are taken care of in the datasheet, by specifying maximums and minimums. The letters you see after the part number are lot codes (or date codes) giving some traceability. No two chips even from the same factory are absolutely identical in every respect, but that doesn't matter provided they meet the specifications in the datasheet.

Military spec would be higher reliability, more stringent testing (and hence much higher price). Not of interest to DIYers
'The total potential here must be nothing less than astronomical.'
'Nothing less. The number 10 raised almost literally to the power of infinity.'
  Reply With Quote
Old 6th February 2012, 09:10 AM   #3
KSTR is offline KSTR  Germany
diyAudio Member
KSTR's Avatar
Join Date: Jul 2007
Location: Central Berlin, Germany
Device Marking Conventions | National Semiconductor
  Reply With Quote
Old 6th February 2012, 11:40 AM   #4
marce is offline marce  United Kingdom
diyAudio Member
Join Date: Jun 2007
Location: Blackburn, Lancs
Military spec is a bit of a misnomer, as there are very few mil spec devices produced these days ther is no market for them like there use to be, but we still require parts for mil/areo/medical (ie life critical designs) so you often have to talk to chip manufacturers about your design requirements. Generaly these parts are tested more and also are the best out of any batches. You will not see these parts on general sale, you have to involve the chip manufacturers in your design work. Automotive range parts tend to be the BEST of the off the shelf parts (better temp range etc).
A lot of mill design is done with Inductrial grade parts or automotive...
  Reply With Quote


Difference between same chips ?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
is there a difference? moray james Everything Else 91 11th November 2009 09:23 PM
What's the difference? squirtacious Tubes / Valves 4 23rd October 2007 04:38 AM
Which chips are out there? Mayday Chip Amps 9 23rd September 2007 12:42 PM
Chips for Chumps aka "Intelligent Chips" jackinnj Solid State 0 15th April 2005 12:37 AM
How many chips do I need ? Cro maniac Chip Amps 10 4th July 2004 11:19 AM

New To Site? Need Help?

All times are GMT. The time now is 12:23 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio