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

[Mattias Rickardsson]

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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