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'[EE]: SMD as good as regular components?'
2001\02\13@115920 by Ken Robertson

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I was wondering, are SMD resistors/capacitors just as good as regular sized ones?  I'm designing a circuit board and it's a bit tight on space.  I'd like to use SMD parts to save space, but not sure if the quality or reliability is  up to par.  I mean, they are are so damn small! :)  Just wanted to make sure.

Thanks,
 Ken

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2001\02\13@121150 by Peter Betts

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I use 0603 SMD resistors on my hobby boards and have never had a problem
(apart from my eyesight)

Obviously watch current. I've had no trouble with 25mA drives into LED
circuits logic control FET transistors.

I use the Bulgarian company Olimex for my PCB's, he does a PCB prototype
(about 200mm*100mm ish) for $26 plus $5 postage. Outstanding! I can useually
get 4->6 PIC circuits out of one card.
That's double sided and through hole plating plus all drilling and
silkscreen.

If you are interested contact..

"Tsvetan Usunov"
Email: spam_OUTusunovTakeThisOuTspamolimex.com

Cheers
Pete


> {Original Message removed}

2001\02\13@123812 by James Paul

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Ken,

Most of the electronics of the day uses SMT components.  Things
like your stereo, TV, VCR, DVD, CD Players, Computer, Etc.
How many times has one of these items broken down because of bad
components?  Not very often.   They do break down because of abuse
or misuse, but seldom due to bad or unreliable parts.

My point is surface mount components are probably some of the MOST
RELIABLE components in existance.  If they weren't, most system
manufacturers wouldn't be using them because they couldn't afford
all the warranty returns that they would get if they weren't
reliable.

As long as you spec the component properly, and do a good job of
installing the component, it probably will outlast you.  How's
that for reliable? :-)

Hope I answered your question.

                                            Regards,

                                              Jim



On Tue, 13 February 2001, Ken Robertson wrote:

>
> I was wondering, are SMD resistors/capacitors just as good as regular sized ones?  I'm designing a circuit board and it's a bit tight on space.  I'd like to use SMD parts to save space, but not sure if the quality or reliability is  up to par.  I mean, they are are so damn small! :)  Just wanted to make sure.
>
> Thanks,
>   Ken
>
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.....jimKILLspamspam@spam@jpes.com

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2001\02\13@125240 by Alan B. Pearce

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I think you would be surprised how many parts are now SMD components with leads
and then encapsulated. The nifty little 0.1uF caps are one that springs
immediately to mind. The only reason to encapsulate them is to support the
leads.

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2001\02\13@134144 by David VanHorn

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At 08:59 AM 2/13/01 -0800, Ken Robertson wrote:
>I was wondering, are SMD resistors/capacitors just as good as regular
>sized ones?  I'm designing a circuit board and it's a bit tight on
>space.  I'd like to use SMD parts to save space, but not sure if the
>quality or reliability is  up to par.  I mean, they are are so damn small!
>:)  Just wanted to make sure.

Absolutely.
In fact, one of the biggest problems in assembly used to be bad solder
joints, caused by the stress of trimming the leads. In theory, a good saw
dosen't stress the joints, but in fact, what happens is that they tend to
let the saws run longer than they ought to, and end up stressing the joints
again.

SMD, no leads, no stress, no problem.

Make sure you have enough heatsinking for whatever power you might be
dissipating though, with smaller bodies, and no leads to act as free heat
sinks, some marginal designs will fail if ported directly to SMD.


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2001\02\14@023822 by Roman Black

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Alan B. Pearce wrote:
>
> I think you would be surprised how many parts are now SMD components with leads
> and then encapsulated. The nifty little 0.1uF caps are one that springs
> immediately to mind. The only reason to encapsulate them is to support the
> leads.

Generally SMT parts are pretty good. Mind you,
I don't get to check many 10 year old SMT circuits,
mainly newer ones.

One problem we do see a lot of is SMT failures
in TV remotes, these get a lot of flex and
vibration. I assume the rigidly mounted brittle
SMT parts (most are ceramic) don't handle the
stretch and flex forces like the older style
remotes with parts that have leads. I would
probably consider heat expansion of the board
and flex issues if designing from scratch with
SMT parts. :o)
-Roman

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2001\02\14@073904 by Michael Rigby-Jones

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> -----Original Message-----
> From: Alan B. Pearce [SMTP:.....A.B.PearceKILLspamspam.....RL.AC.UK]
> Sent: Tuesday, February 13, 2001 5:52 PM
> To:   EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
> Subject:      Re: [EE]: SMD as good as regular components?
>
> I think you would be surprised how many parts are now SMD components with
> leads
> and then encapsulated. The nifty little 0.1uF caps are one that springs
> immediately to mind. The only reason to encapsulate them is to support the
> leads.
>
Not seen these, all the 100n caps I've used have been 0603 ceramic packages
with no sign of leads!  I have seen quite a few tiny electrolytics mounted
on a small plastic carrier to be used as an SMD device.

Mike

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2001\02\14@172326 by Peter L. Peres

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SMD outperform their legged friends in all regards excepting price and
technician-friendliness (unless specialized tooling and training are
available). There are some tricks related to high G environments but I
don't know much about that.

Peter

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