Are you sure those are all the markings on the part, as that almost looks
like a date code, I would expect at least some alpha's in the part number.
I work for ON, and I checked the whole product catalog and can find no
reference to any such number except as a part of a mot part for a low power
tv tuning circuit.  I would expect more markings than just that on a part,
check both sides, and knowing what package type mibht help also.

Dave Gomez

On 10/23/02 4:29 PM, "Morgan Olsson" <morgans.rt@TELIA.COM> wrote:

> Hi electronician detectives out there!
>=20
> Now I have dissassembled my dads TV-set...  I have found that the main su=
pply
> switch transistor is fried, and components around it seem OK, so I am loo=
king
> for what to replace it with.
>=20
> It is an isolated TO220/SOT186, labeled:
>=20
> ON
> 4827
> PHm423
>=20
> I don=B4t even know what manufacturer it is.  I thought it to be ON
> semiconductor, maybe Philips, but neither Google, or ON semiconductor nor
> Philips website searches could find anything useful on 4827.  Tried a lot=
 of
> sites and search engines and criteria, and finally found searching for ON=
4827
> at http://www.electrospec-inc.com/ gave a list containing an item
> "4827BUT12AF", probably an alias, bot how identical is BUT12AF?
>=20
> BUT12AF:
> http://www.semiconductors.philips.com/pip/BUT12F.html#datasheet
>=20
> Data seem to be somewhat OK.  I can se from the circquit it need to be a =
NPN
> switcher in a flyback design, 230VAC mains, so it is possible, but the Uc=
eo of
> 450V for the BUT12AF seem too little.  But it can sustain Ucesm (peak) of
> 1000V so it is possible...?
>=20
> However while replacing a tranny it is important to have enough voltage
> capacity, enough hFE and good switching time so i would prefer to find th=
e
> original manufacturer of "4827"
>=20
> Any ideas?
>=20
> (BTW, while i begun writing this letter my old TV, that my dad borrowed a
> couple hours ago, let out lot of smoke and he threw it out... Spooky.  No=
w i
> have checked the mains voltage in his house and it IS OK.   One more to
> repair...)
>=20
> Thank you
> /Morgan=20
>=20
> --
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>=20
>=20
>=20

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