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LM833 and LM833-N clarification on data sheet differences sought.

Karl Samson
Prodigy 30 points
Other Parts Discussed in Thread: LM833, LM833-N

A look through the more recent data sheet issues for this device have thrown up a couple of questions...

In the TI data sheet 'SLOS481B –JULY 2010–REVISED OCTOBER 2014' for the LM833, fig 8.2, the functional block diagram clearly shows the output stage as being a quasi complementary using two NPN devices. This is at odds with 'SNOSBD8E –MAY 2004–REVISED MAY 2012 ' for the LM833-N and also at odds with old data sheets going back through the history of the device which show the standard complementary emitter follower pair.

This 'difference' (if it is a real production change) would make significant changes to the devices performance, perceived and actual.

Any clarification on this would be appreciated.

  • 0
    TI__Guru 52115 points

    Hi Karl,

    Basically LM833 and LM833-N are two different devices. That's why you can find two different datasheets in ti.com.

    Andy

  • 0 in reply to Andy Liu (BMS)
    Prodigy 30 points

    Thanks for the reply Andy however I'm still left wondering over this... the LM833N was always just the 'moulded plastic package' in National Semi's data sheets. It had no other meaning to my knowledge.

    Here you can see the two data sheets, the TI and the National one, both for the LM833. If these are correct, then the change in output stage architecture in the TI version is a fundamental change.

  • 0 in reply to Karl Samson
    TI__Guru 52115 points

    LM833-N is an op-amp originally from National Semiconductor. NS named this device as LM833. As for the package, LM833N means a PDIP package LM833-N. NS calls PDIP package as “N” package.

     TI developed another LM833 as 2nd source device and named it LM833. When TI made LM833, TI changed its output stage to NPN type from VPNP.

    After TI acquired NS, TI renamed NS’s LM833 to LM833-N in order to differentiate the LM833-N from TI’s LM833. Please don’t be confused by LM833-N and LM833N.

  • 0 in reply to Andy Liu (BMS)
    Prodigy 30 points

    Thank you so much for that information, it has clarified what was a confusing area of doubt over the two devices.