The names of diodes in a melf package

[fuzzzy]

Diode model

Hi

I've got a board with 2 different diodes in a melf package(cylindrical 5mm long 2,5 radius) I'd like to know their name.
on the first there is a 'Z' and '18' is this a 18V zener??
the other has got a purple line around its black body. How can i replace it?

thanks

 

[dovran2021]

Diode model

Z18 is Zener diode but no idea about value

 

[marzero]

Diode model

look here...
this manual is very useful!!!!
for all kinds of semiconductors...

Have a lot of fun!! (steal... xD)

https://bking_size.spymac.com/ECG.rar

or here... is similar...
**broken link removed**

 

[fuzzzy]

Re: Diode model

I can't open first link.....

 

[Santoshalagawadi]

Re: Diode model

yes freind it is a zener diode

 

[vicky]

Re: Diode model

hi
yes its a zener diode and you r also ok too that its a 18 ref. volts diode.
but its unable to tell you about the second ones value but the circle on the diode is indicatind that side of the diode is the anode one.

 

[fuzzzy]

Re: Diode model

hi vicky,


the second diode has got one black circle indicating katode and a second purple circle near first one.... i think it can indicate its value like colors indicates values on resistos.

i never saw this kind of diode.

i can say that it is mounted at the end of a 5 line leds. i think it only needs against polarity inversion. what do you think?

the first diode(zener) instead i mounted in parallel with these leds.

thanks for help

 

[smithpwb]

Diode model

hello ,I'm a newer.hope that people here can help each other