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'[EE]:smt component selection'
2003\01\05@124259 by Bob Japundza

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Hello All,

I am drawing a schematic in Eagle for my first smt board.  After looking through the myriad of available smt packages for discrete components in the rcl library, the fundamental question is: which component package is best for my application?  Are there any general guidelines for choosing packages?  For example, when using a smt resistor, which package is the most common, the M1206?

Thanks
Bob

2003\01\05@124906 by Sid Weaver

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In a message dated 01/05/2003 12:43:22 Eastern Standard Time,
spam_OUTBob.JapundzaTakeThisOuTspamREALMED.COM writes:


> I am drawing a schematic in Eagle for my first smt board.  After looking
> through the myriad of available smt packages for discrete components in the
> rcl library, the fundamental question is: which component package is best
> for my application?  Are there any general guidelines for choosing
> packages?  For example, when using a smt resistor, which package is the
> most common, the M1206?
>
>

Good afternoon, Bob

The 1206 is a common template fora 1/4W resistor, I believe.  The problem is,
sometimes the component you want isn't listed in the library.  Then you have
to build your own template.  Even so, with the templates available, it it
necessary to carefully check the dimensions of the component you want to use
agains the dimesnions of the available template.  It can be a very time
consuming process - I just went through it.


Sid Weaver
W4EKQ
Port Richey, FL

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2003\01\05@130645 by Nick Veys

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1206 is very easy to solder by hand.  When you get down to 0608 or smaller it becomes a real pain to hand solder, I recommend bigger SMT parts if you're making these by yourself.  Even the big SMT parts are still much smaller than their Thru-Hole brothers.

SO-8 and the other SO devices are pretty easy to solder as well so you can't go wrong with those.

Bigger the better IMO.

Original Message -----------------------
Hello All,

I am drawing a schematic in Eagle for my first smt board.  After looking through the myriad of available smt packages for discrete components in the rcl library, the fundamental question is: which component package is best for my application?  Are there any general guidelines for choosing packages?  For example, when using a smt resistor, which package is the most common, the M1206?

Thanks
Bob

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2003\01\05@133938 by Stuart Meier

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Bob

Are u handsoldering? If so, as big as poss, 1206 is fine.
I found caps in SMT now difficult to source in 1206 sometimes, 0805 often the norm.
Res usually I use 1206 unless space is a real problem - one design has two traces below a 1206, not
so easy on 0805 - in fact I wouldn't try it.
Don't forget u can use 0R 1206 links to cross traces too, relatively easy to add a 0r sometimes to
avoid design issue.

Stuart
{Original Message removed}

2003\01\05@142543 by PicDude

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Looked into this as well recently, and based my component
selection on a few things -- I needed to make it as small
as possible to save space (else what's the point), then as
large as possible to be solderable by hand, and available.

Once I have selected the part for the schematic, a quick
peruse thru Digikey's site told me what's available that
would work, and I chose from there.

One nice thing is that even in the 1206 size, I save a
lot of space over thru-hole components just because it
only occupies one side of the board.  So for my initial
entry into SMT, the smallest of the smallest isn't critical.

Cheers,
-Neil.




> {Original Message removed}

2003\01\05@143005 by Spehro Pefhany

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At 02:23 PM 1/5/03 -0500, you wrote:
>Looked into this as well recently, and based my component
>selection on a few things -- I needed to make it as small
>as possible to save space (else what's the point), then as
>large as possible to be solderable by hand, and available.
>
>Once I have selected the part for the schematic, a quick
>peruse thru Digikey's site told me what's available that
>would work, and I chose from there.
>
>One nice thing is that even in the 1206 size, I save a
>lot of space over thru-hole components just because it
>only occupies one side of the board.  So for my initial
>entry into SMT, the smallest of the smallest isn't critical.

When (if) you start buying components by the reel, you might
want to consider 0402/0603 as that's where the volume is for
OEMs, so you'll find the best availability and prices. At least
for resistors.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam.....interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2003\01\05@143414 by tbyBiZW5lZGnEjWnEjQ==?=

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Hi, Neil!

One other thing about SMT components: not only space savings, at high enough
frequencies, inductivity and capacity of legs of through hole elements
starts to play a role.
Regards, Samo
----- Original Message -----
From: PicDude <picdudespamspam_OUTNARWANI.ORG>
To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Sunday, January 05, 2003 8:23 PM
Subject: Re: [EE]:smt component selection


Looked into this as well recently, and based my component
selection on a few things -- I needed to make it as small
as possible to save space (else what's the point), then as
large as possible to be solderable by hand, and available.

Once I have selected the part for the schematic, a quick
peruse thru Digikey's site told me what's available that
would work, and I chose from there.

One nice thing is that even in the 1206 size, I save a
lot of space over thru-hole components just because it
only occupies one side of the board.  So for my initial
entry into SMT, the smallest of the smallest isn't critical.

Cheers,
-Neil.




> {Original Message removed}

2003\01\05@145528 by PicDude

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Spehro Pefhany scribbled:
>
> When (if) you start buying components by the reel, you might
> want to consider 0402/0603 as that's where the volume is for
> OEMs, so you'll find the best availability and prices. At least
> for resistors.

This is good to know.  Thanks.  So far, I'm still a hobbyist,
though I still look at everything I do as a business opportunity.

Cheers,
-Neil.

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