[sdiy] Issue with unusual SMD package size

Rutger Vlek rutgervlek at gmail.com
Tue Mar 7 14:38:49 CET 2017


I always thought imperial SMD sizes won from the metric ones. If I had to
guess, I'd say imperial. Other than that, have a look at how much leigh way
the current component pads give you, perhaps smaller or larger parts easily
fit.

On Tue, Feb 21, 2017 at 9:26 AM, <rsdio at audiobanshee.com> wrote:

> Get some calipers and measure the actual SMD pads on your PCB. Then look
> at candidate capacitors from Mouser that match 4700nF 6.3V in similar
> sizes. For each candidate, obtain the data sheet from the manufacturer and
> look at the recommended pad sizes along with the actual dimensions of the
> part. You'll find one that will fit. So long as the specs are the same,
> 4700nF 6.3V, it shouldn't matter if the part is physically smaller. If you
> can't find any smaller, then just hope that the SMD pads on your PCB are
> large enough to handle a larger cap.
>
> When I design PCB layouts, the assembly shop likes it when I make sure the
> pads are a bit larger than the actual parts. That's why I say it shouldn't
> be a problem if you locate a smaller part, so long as it fits the 4700nF
> 6.3V specs.
>
> Brian
>
>
> On Feb 20, 2017, at 11:40 PM, cheater00 cheater00 <cheater00 at gmail.com>
> wrote:
> > Just a follow up. Here's the part in the service manual:
> >
> > http://i.imgur.com/EhEzUfu.png
> >
> > It's right above U903, above the "3" in the "U903" label.
> >
> > U903 itself is a big square IC on the left side of the image.
> >
> > On Tue, Feb 21, 2017 at 8:05 AM, cheater00 wrote:
> >> Hi guys, I have a fairly big issue. I'm trying to repair my phone, and
> >> one of the capacitors I might have to replace is specified as:
> >>
> >> C824 4700nF 6.3V 1106
> >>
> >> However, Mouser doesn't have a capacitor package size with code 1106!
> >> What do I do? Can I use an (imperial) 1206? Can I use an imperial
> >> 1005? Do I do something else? Do I go to some special capacitor house
> >> that has all those weird sizes?
> >>
> >> I have a second issue, too. Some capacitors are specified as 0603. How
> >> do I know if that's metric or imperial? I'm reading this off some
> >> wonky Korean service manual pdf, it's not really forthcoming or really
> >> well written at all.
> >>
> >> Thanks for any tips!
>
>
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