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V3nn3tj3
 Post subject: Replace SMBJ12A by SMBJ13A
PostPosted: October 18th, 2010, 11:21 
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Joined: October 18th, 2010, 11:17
Posts: 5
Location: Belgium
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
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dobrevjetser
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 19th, 2010, 4:00 
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Joined: December 27th, 2006, 10:15
Posts: 1852
Location: Belgium
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

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V3nn3tj3
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 19th, 2010, 11:13 
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Joined: October 18th, 2010, 11:17
Posts: 5
Location: Belgium
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
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fzabkar
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 19th, 2010, 22:29 
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Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia
The SMBJ13A has a higher breakdown voltage than the SMBJ12A. Both provide overvoltage protection, but the latter would have a better safety margin.

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V3nn3tj3
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 22nd, 2010, 2:55 
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Joined: October 18th, 2010, 11:17
Posts: 5
Location: Belgium
Would 1 extra volt affect my hdd?

Nick
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dobrevjetser
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 22nd, 2010, 3:18 
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Joined: December 27th, 2006, 10:15
Posts: 1852
Location: Belgium
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

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Datarecovery in Belgium, Holland, France and Germany
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V3nn3tj3
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 22nd, 2010, 5:43 
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Joined: October 18th, 2010, 11:17
Posts: 5
Location: Belgium
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
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dobrevjetser
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 22nd, 2010, 7:31 
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Joined: December 27th, 2006, 10:15
Posts: 1852
Location: Belgium
No.

Dobre

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Datarecovery in Belgium, Holland, France and Germany
Datarecoverytools http://www.drtools.eu
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V3nn3tj3
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 24th, 2010, 8:46 
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Joined: October 18th, 2010, 11:17
Posts: 5
Location: Belgium
Just reporting that I got the tvs replaced with a SMBJ13A yesterday evening and all is working again !!!

Thanks again for the help, Nick
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dobrevjetser
 Post subject: Re: Replace SMBJ12A by SMBJ13A
PostPosted: October 25th, 2010, 2:46 
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Joined: December 27th, 2006, 10:15
Posts: 1852
Location: Belgium
Dont trust this disk any more; copy your data to a new drive.

Dobre

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Datarecovery in Belgium, Holland, France and Germany
Datarecoverytools http://www.drtools.eu
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