Replace SMBJ12A by SMBJ13A

[V3nn3tj3]

Hello,

I was wondering if i could replace my tvs 12v diode marked LEK from ON Semiconductors (which is a SMBJ12A) with a tvs diode from a old hard drive marked BUF from st semiconductor (this is a SMBJ13A)
I'm just not sure, they both protect the 12v rail so it should be ok?

Thanks Nick

[dobrevjetser]

Yes, should work. However, be carefull there is no other short circuit in the pcb.
Better use a bench top power supply to test.


Dobre

[V3nn3tj3]

i don't think there is a other shortage in my pcb, checked all the resitors, none of them are faulty...
i use a power supply that has a good and steady 12v, and if there is a shortage it shuts down. Someone making pcb boards for his job will replace it for me.
will report back on sunday.

Thanks, Nick

[fzabkar]

The SMBJ13A has a higher breakdown voltage than the SMBJ12A. Both provide overvoltage protection, but the latter would have a better safety margin.

[V3nn3tj3]

Would 1 extra volt affect my hdd?

Nick

[dobrevjetser]

This is a protection circuit. It only intervenes in case the power supply of you PC breaks down, so it wont make much difference for normal functionning of your drive.

Dobre

[V3nn3tj3]

Yes, i mean, when the powersupply would fail, would that extra volt damage the hard drive?
got myself a new powersupply so no worries about that.

Nick

[dobrevjetser]

No.

Dobre

[V3nn3tj3]

Just reporting that I got the tvs replaced with a SMBJ13A yesterday evening and all is working again !!!

Thanks again for the help, Nick

[dobrevjetser]

Dont trust this disk any more; copy your data to a new drive.

Dobre