Replacement for BCX42 PNP transitor? FMMT55???

I am looking for replacement for an BCX42 PNP transistor that got
damaged in an LCD inverter.
The FMMT555A in mouser.com seems to be an ideal candidate, but the
datasheet has all the voltage in negative number(for example Vcbo
-160v,Vceo -150v) and the bcx 42 has all the voltage in positive.

I am not familiar with finding the substitution for transistor.
Can someone give a comment?
Is FMMT55A an ideal replacement for BCX42 ?


FMMT555TA
http://www.zetex.com/3.0/pdf/fmmt555.pdf
BCX42
http://www.datasheetcatalog.com/datasheets_pdf/B/C/X/4/BCX42.shtml

 

[Pieter]

On Mon, 19 Nov 2007 23:12:39 -0800 (PST), saturnlee@yahoo.com wrote:

I am looking for replacement for an BCX42 PNP transistor that got
damaged in an LCD inverter.
The FMMT555A in mouser.com seems to be an ideal candidate, but the
datasheet has all the voltage in negative number(for example Vcbo
-160v,Vceo -150v) and the bcx 42 has all the voltage in positive.

This is just how the manuvacterer defines it, this is no problem.

I am not familiar with finding the substitution for transistor.
Can someone give a comment?
Is FMMT55A an ideal replacement for BCX42 ?
FMMT555TA
http://www.zetex.com/3.0/pdf/fmmt555.pdf
BCX42
http://www.datasheetcatalog.com/datasheets_pdf/B/C/X/4/BCX42.shtml

I compared them. The fmmt555 seems to be better in several parameters,
but there is a difference: the transistion frequency seems to be
different. The manufacterers used different methods to measure several
parameters, what makes comparing difficult.

I think it is safe to use the fmmt555 as replacement. Do you know the
switching frequency?

Pieter

 

[Jim Backus]

On Tue, 20 Nov 2007 07:12:39 UTC, saturnlee@yahoo.com wrote:

The FMMT555A in mouser.com seems to be an ideal candidate, but the
datasheet has all the voltage in negative number(for example Vcbo
-160v,Vceo -150v) and the bcx 42 has all the voltage in positive.

Quite reasonable for a pnp transistor to be specified with negative
voltage ratings. Whereas an npn transistor has the emitter connected
to the negative supply and the collector positive, a pnp transistor
would have the emitter connected to the positive supply with the
collector negative.

--
Jim Backus running OS/2 Warp 3 & 4, Debian Linux and Win98SE
bona fide replies to j <dot> backus <the circle thingy> jita <dot>
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