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SMD component - Can anyone identify these two smd diodes?

Neet

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Can anyone identify these two smd diodes?IMG_20201030_105607.jpg
 
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Neet

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I searched them with exact name but didn't find anywhere.From where I can buy them?Both r sort
 

KlausST

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Hi,

I´ve done an internet search for: [diode smd marking code "WN"]

many thousands of results. But even on the first page there are some very good informations.
like this one: http://www.s-manuals.com/smd/wn
if you ignore all devices with unsuitable package (3-pin, 6-pin, size, picture...) then there are just 3 devices remaining.
on the most right side of the table there are links to the datasheets. Read through them about device marking.

Maybe there is no 100% exact match. Then you need to solder the device from the PCB and do some measurements.

Klaus
 

Neet

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Both r burnt now.multimeter now show only continuity.how can I measure them now?
 

KlausST

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Hi,

are you sure? They don´t look burnt.
And for zeners it´s quite usual that they show continuity in one direction.

How did you measure them? It can´t be done "in circuit".

If you can´t measure them:
* contact the device manufacturer
* draw a schematic from the PCB wiring?
* do trial and fail?

Klaus
 

Neet

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They are showing continuity in both direction now.before burn they were showing value in one direction.
 

FvM

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There's no chance to indentify a defective diode by measurements. As already shown, marking codes aren't unique. You probably need to review several manufacturer component and package datasheets to narrow down the selection. A first step would be to determine the packe length to distinguish between popular candidates like SOD-123/323/523 etc.

By the way, if the diodes are burnt, isn't it likely that other components are damaged too?
 

KlausST

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Hi,
They are showing continuity in both direction now.before burn they were showing value in one direction.
They were good before, now they are burnt. Why? What happened?

Klaus
 

Neet

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I replaced the other damaged components. Struggling with these two components.
--- Updated ---

Hi,

They were good before, now they are burnt. Why? What happened?

Klaus
These components are from primary section of a pc power supply
 
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FvM

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O.k., it's SOD-123.
"WY" looks like Diodes BZT52C2V0, exactly same marking style. WN might be BZT52C22 from Diodes or TSC, or BZT52C18 from Vishay.
 

Neet

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O.k., it's SOD-123.
"WY" looks like Diodes BZT52C2V0, exactly same marking style. WN might be BZT52C22 from Diodes or TSC, or BZT52C18 from Vishay.
Think so but want to confirm before installing
 

KlausST

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Hi,

The only way to be sure: contact the manufacturer.
You can't by the pictures nor by the markings.

Klaus
 

d123

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Hi,

Shouldn't quality datasheets give the SMD code marking?
 

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Shouldn't quality datasheets give the SMD code marking?
The linked Diodes datasheet https://www.diodes.com/assets/Datasheets/ds18004.pdf does, other manufacturers have the information in separate package or marking datasheets. But as already told, markings are not unique, they don't necessarily help to indentify arbitrary unknown components, although they sometimes do.
 
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