Re: standard size for smt tantalums?

On Mon, 4 Jul 2005 20:29:06 -0400, "Tam/WB2TT" <t-tammaru@c0mca$t.net>
wrote:

>
>"Michael Noone" <mnoone.uiuc.edu@xxxxxxxxx> wrote in message
>news:Xns9689A2EA41978mnooneuiucedu127001@xxxxxxxxxxxxxxxxx
>> Hi - I was just wondering - I've noticed that there are very few tantalums
>> made in the standard discrete surface mount sizes (1206, 0805, etc.). I
>> was
>> able to find a very limited selection of such capacitors made by TAC (for
>> example, Digi-Key part # 478-2562-1-ND). But these are expensive (over $2
>> each for an 0805 in quantites of 100, compared to $.50 for similarly
>> specced tantalums in different packages). So my question is this: Are
>> there
>> standard sizes for tantalums? Or does each manufacturer have their own
>> sizes?
>
>I don't have the specs handy, but I suspect the largest size tantalum that
>would fit in a 1206 package would be around 1 ufd at 10V.
>>
>> As long as I'm on the topic of tantalums - can somebody tell me why they
>> are reccomended for power smoothing? Would a ceramic work just as well?
>> (as
>> they're cheaper and available in sizes I'm more used to)
>
>Check the price on a 1 ufd ceramic; and where would you buy one that is 100
>ufd?
>

You can now get a 100 uF 1206 ceramic, but they have rotten tc's and
voltage/capacitance coefficients.

There are five or six standard surfmount tantalum sizes. DON'T use
them for power supply bypasses; they tend to detonate. The new polymer
tantalums are OK.

John


.

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