[sdiy] SMT diodes: MELF vs. SOT-23 chip?

[Roman]

micro-melf is much smaller than SOT23 and signal path is so much cleaner. You can insert the micromelf diode almost anywhere, while with SOT32 you'd have to push the traces aside to fit it.
And LL4148 that I use do not roll all over the place, because they have square section! It is then so much easier to grab them than round melfs with either tweezers or pickup nosle.
They really look good too. PCB is so boring without them.

There are also 4148 diodes in regular chip packages - 1206, 0805, 0603, not to mention unusable manually smaller types

Roman

Dnia 23 września 2015 23:56 Mattias Rickardsson <mr at analogue.org> napisał(a):



> 
> > Tom,
> 
> no problems so far, I'm just curious if there are any reasons to
> choose MELF before chips. Two MELF diodes are around 50% more
> expensive (each something like €0.005 + €0.003 for mounting it, for
> both = €0.016) compared to one SOT-23 dual diode (€0.008 + €0.003 =
> €0.011). The MELFs also occupy more space on the PCB. But they do look
> much better, with their tiny retro-style glass jar. :-)
> 
> /mr
> 
> 
> On 23 September 2015 at 21:15, Tom Bugs <admin at bugbrand.co.uk> wrote:
> > Interesting question & I hope people will respond 'on list' to share
> > thoughts.
> >
> > I went to MELF diodes as they seemed so similar to the regular 1N4148s - ie.
> > for common silicon diodes apps
> > Only used SOT-23s for dual schottky between rails (for protection apps) as
> > it seemed such a convenient form.
> >
> > The only time I actively choose between SOT23 and MELF is for zeners,
> > dependent on current.
> >
> > What's driving your question Mattias?
> > Are you responding to a strange problem that has cropped up in a design?
> > or...
> >
> > Cheers, Tom
> >
> >
> >
> >
> > On 23/09/2015 18:30, Mattias Rickardsson wrote:
> >>
> >> I've used surface mount diodes in both MELF (glass style) and SOT-23
> >> duals (chip style), but are there any significant differences between
> >> these two when it comes to audio/synth applications?
> >>
> >> Sometimes the shape and other physical properties of simple basic
> >> components can affect more than you first might think. :-)
> >>
> >> Thanks,
> >>
> >> /mr
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