Help to ID smd diode

[cozza]

Hi I have a few dali LED ballasts to repair, in all units the diode / TVS has failed shorted and blown the series 4.7k resistor.

I don't recognise the logo unfortunately - can anyone help ID this diode / TVS?

Initially I thought from the DK marking it might be be an SMBJ60A uni-directional 60V TVS, but that does not make sense in the circuit.

The resistor connects to HV + and the anode of the diode to HV +. The common point connects to an HV startup / line voltge sense pin on the IC, HVLED001A.

I've measured a working unit and there is up to 314V DC across this part - ruling out the 60V TVS part. It's not part of the application note for the IC, looks like a blocking diode.

Any help appreciated

[abdulbadii]

cross check ?
https://www.mouser.com/c/?q=transil
https://www.digikey.com/en/products/filter/tvs-diodes/144?s=N4IgTCBcDaIC4CcCGA7AzgSwDYgLoF8g
https://octopart.com/search?q=transil&currency=USD&specs=0

[cozza]

Thanks, but that's not really helpful.

I can't find a substitute for it if I don't know the specs yet.

It could be a diode or a transil.

[fzabkar]

Can you tell us the date codes on the other parts? I'm thinking that "09" is a date code, but I'd like to be more confident.

[cozza]

Hi Fzabkar. A few of the ICs have a 2018 date code, the QC stickers on the ballast indicate week 48/ 2019.

Thank you!

[cozza]

Hi I'm bumping this request again. Can anyone ID the manufacturer's logo on the device?

Searching semi manufacturer logo lists has so far turned up no match for me

[maxwelllls]

Thanks, but that's not really helpful.

I can't find a substitute for it if I don't know the specs yet.

It could be a diode or a transil.

DK mark,maybe is a 14V zener diodes,MMSZ4701