Re: LM336 vs. LM336B ?


<clicliclic@xxxxxxxxxx> wrote in message
news:1126993443.786829.227190@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Roger Hamlett schrieb:

> <clicliclic@xxxxxxxxxx> wrote in message
> news:1126982269.683068.214760@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Roger Hamlett schrieb:
>
> > "Andre Majorel" <cheney@xxxxxxxxxxxxxxx> wrote in message
> > news:slrndil386.s25.cheney@xxxxxxxxxxxxxxxxxxx
> > > What is the difference between the LM336 and LM336B ? I can't
> > > find any on the data *** I have doesn't show any and yet
> > > Farnell carries both (at very different prices).
> > >
> > > Thanks in advance.
> > The standard National data ***, has two columns in the electrical
> > characteristics section, one labelled 'LM136A/LM336A', and the other
> > 'LM336B'.
>
> > This should probably read LM136A/LM236A. The LM136 has an operating
> > temperature range from -55°C to +150°C, the LM236 from -25°C to
> > +85°C.
> No. There is a seperate column for the 136/236.
>
> > > The B has slightly worse tolerance on the initial reference voltage,
> > > but
> > > about twice as good temperature stability.
> >
> > Best Wishes
> >
> > The LM336 is specified at (2.49 +/- 0.10)V at 25°C, and the LM336B at
> > (2.49 +/- 0.05)V, which is twice as good. Between the two, there is no
> > difference in temperature stability. The stability of the LM136 and
> > the
> >
> > LM236 is worse because it refers to a larger temperature range.
> >
> > Martin.
> Sorry, but this differs completely from the ***. The 136/236, has it's
> own seperate column. I can only say what is printed on the sheets I
> have...
>
> Best Wishes

> I think there is little real disagreement. Unfortunately the original
> poster didn't tell us if he meant the 2.5V versions or the 5V versions
> of this chip. Unfortunately you mentioned only the LM336A and LM336B,
> but not the LM336 (no A or B suffix) he also asked about. My point was
> to explain the seemingly strange fact that the higher grade
> LM236/LM236A
> and LM136/LM136A have worse temperature stability specs.
OK.

> My reference is the National Semiconductor pdf data*** dated May
> 1998.
> This has just two columns: one labelled "LM136A-2.5/ LM236A-2.5/
> LM136-2.5/ LM236-2.5" and the other "LM336B-2.5/ LM336-2.5".
Mine was the 2004, printed databook. They look to have 'fiddled' a bit
with their layout and claims.
The usual explanation for a less stable version being more expensive, is
that they basically don't sell an of them!... :-)

Best Wishes



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