On 27 Nov 2010 at 14:00, James D Baker wrote:
> On Sun, 2010-11-28 at 08:01 +1300, Brent Brown wrote:
>=20
> > =20
> > > *2 Conformal coating or washing of the components is not acceptable
> > > because they are not hermetically sealed.
> > >=20
> > That indeed would be bad. However the data sheet I looked at covers a
> > whole range of parts, seems to depend on exactly where you look... (kee=
p
> > reading till you find the specs you prefer?!)  eg:
> >=20
> > http://www.farnell.com/datasheets/45562.pdf
> >=20
> > >From page 12 of above doc:
> >=20
> > MHz Chip Type Notice (Soldering and Mounting) for Automotive
> > CSTCC/CSTCR/CSTCE_V/CSTCE_G/CSTCV/CSACV Series
> >=20
> > 2. Wash
> > (1) Cleaning Solvents
> > HCFC, Isopropanol, Tap water, Demineralized water,
> > Cleanthrough750H, Pine alpha 100S, Techno care FRW
> >=20
> > 4. Others
> > Conformal coating of the component IS acceptable.
> > However, the resin material, curing temperature, and
> > other process conditions should be evaluated to
> > confirm that stable electrical characteristics are
> > maintained.
> >=20
> > The assumption I made was that the CSTCE8M00G55Z is a CSTCE_G series
> > device so has the above specs. I could the be wrong. The low number of
> > boards (20) I've made so far with the parts have been washed and then
> > conformal coated without any problems.
> >=20

> That data sheet from Farnell is P16E.pdf dated 08.3.3
>=20
> The one I fetched is P17E.pdf dated 10.8.3 so it would seem that Murata
> has changed things.

>=20
> www.murata.com/products/catalog/pdf/p17e.pdf
>=20
> CSTCE 8M00 G 55Z=20
>=20
>   All of the CSTCC, CSTCE, and CSTCW parts are marked with a
> "*2" which points to the objectionable foot-note.

Thanks James, yes you are correct, the most up to date datasheet states the=
=20
CSTCE part is neither washable nor conformal coatable. I'll have to find a=
=20
substitute.

--=20
Brent Brown, Electronic Design Solutions
16 English Street, St Andrews,
Hamilton 3200, New Zealand
Ph: +64 7 849 0069
Fax: +64 7 849 0071
Cell: +64 27 433 4069
eMail:  brent.brown@clear.net.nz


--=20
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