BC557 is a VHF  150 mhz PNP in TO92. The BC547 is a general purpose NPN TO92 50 volt
good to 300mhz.
Rick

Robert L Cochran wrote:

> What can substitute for the BC557 and BC547?
>
> Thanks
>
> Bob
>
> Rick C. wrote:
> > BC183 is an NPN general purpose in a TO92. Looks like a PN2222 or 2N3904 would
> > work. The BC213 looks like its complimentary device (PNP). A PN2907 or 2N3906
> > should work. The BC550 seems like it could also be replaced by the PN2222 also.
> > For most small signal circuits under 40 volts and from 20 mhz down to DC
> > switching, the above devices should sub out.
> > Rick
> >
> > "David J. Kloc" wrote:
> >
> >
> >>I am incorporating a portion of an old circuit into one of my designs.  The
> >>old circuit uses
> >>European coded transistors.  I have been unable to easily identify a US
> >>equivalent on the
> >>Web.  Some of the parts that I am attempting to translate are the BC183,
> >>BC213 and
> >>BC550C.  Is there a list of equivalents (i.e. 2Nxxxx) out there that
> >>someone can direct me
> >>to?  Recommendations for equivalents would also be welcome.
> >>
> >>Thanks
> >>
> >>Dave Kloc" <dkloc@worldnet.att.net>
> >>
> >>--
> >
> >
> > --

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