Philips Zener Diode Values and Power transistor

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Hi all,

I came across a faulty zener diode and wanted to replace it. Its
markings is slightly smerged thus i cant really make out the first two
number/alphabet.

Marking: zyw54ph ("z" and "y" may not be wat i perceived to be)
Casing: Small, white, round.

I found similar diodes from farnell (bzt03 series) but i could not make
out the ratings. Any suggestion what rating this zener diode may be?

I have another power transistor but no legible markings can be read. Is
there any way or tests where i can conduct to verify the trasistor
values?

Any help will be greatly appreciated.
Tks in advance.

ywz

 

[Eeyore]

Hi all,

I came across a faulty zener diode and wanted to replace it. Its
markings is slightly smerged thus i cant really make out the first two
number/alphabet.

Marking: zyw54ph ("z" and "y" may not be wat i perceived to be)
Casing: Small, white, round.

BYW54 most likely
http://www.semiconductors.philips.com/pip/BYW54_TO_56_2.html

ph means Philips

I found similar diodes from farnell (bzt03 series) but i could not make
out the ratings. Any suggestion what rating this zener diode may be?

I have another power transistor but no legible markings can be read. Is
there any way or tests where i can conduct to verify the trasistor
values?

You could check to see if it's bipolar or mosfet and npn/pnp or n/p channel.
Then substitute using common sense and a bit of nouse !.

Graham

 

[Eeyore]

Hi all,

I came across a faulty zener diode and wanted to replace it. Its
markings is slightly smerged thus i cant really make out the first two
number/alphabet.

Marking: zyw54ph ("z" and "y" may not be wat i perceived to be)
Casing: Small, white, round.

I found similar diodes from farnell (bzt03 series) but i could not make
out the ratings. Any suggestion what rating this zener diode may be?

Why do you think it's a zener ?

Graham