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Old 06-25-2019, 01:02 PM   #1
Per Hansson
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Default Help to identify SMD Zener diode

Hi, I have this Zener diode that is open.
I took pictures before desoldering it, I have attached them here.
Can anyone tell what Zener voltage this has from the markings?
I have an idea but don't want to cloud the opinions so I'll wait for what you say...
Attached Images
File Type: jpg IMG_7365.jpg (41.6 KB, 21 views)
File Type: jpg IMG_7370.jpg (105.7 KB, 22 views)
File Type: jpg IMG_7379.jpg (159.1 KB, 17 views)
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Old 06-25-2019, 04:25 PM   #2
stj
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Default Re: Help to identify SMD Zener diode

5v1 zener or a 7v tvs in my book.
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Old 06-25-2019, 04:48 PM   #3
redwire
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Default Re: Help to identify SMD Zener diode

Not sure if SOD-123 or SOD-323 package.
Diodes Inc DDZ5V1BS SOD-323
Diodes Inc DDZ5V1B SOD-123
It used to be a Zetex part.
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Old 06-25-2019, 04:51 PM   #4
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Default Re: Help to identify SMD Zener diode

probably get an educated guess from where it is fitted in the circuit . tvs would test open as a diode . is there another the same in the unit ?
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Old 06-26-2019, 10:27 AM   #5
Per Hansson
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Default Re: Help to identify SMD Zener diode

Thanks, yes this is the same as I figured, it seems to match SOD-123 physically and that it infact is a Diodes Inc DDZ5V1B (5.1v Zenerdiode with 0.5w rating)
What threw me off was a Youtube video where in the comments people wrote it was a 5.2v Zener, but seeing how uncommon those are I doubted it...
I'm glad you all agree
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Old 06-27-2019, 11:08 AM   #6
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Default Re: Help to identify SMD Zener diode

Posting this here also for future reference, it's from the datasheet.
The date code marking is B5 (May 2014) and this matches well with other components on the PCB.
The zener diode model marking is KM (DDZ5V1B)

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