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Identify smd diode

dsb79

Sep 7, 2012
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Hi,need help identify an smd diode with code D052 print in the package.
This diode was taken from laptop board that the battery won't charge.
Regards.
 

dsb79

Sep 7, 2012
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Can you tell me here i can buy the component, do you have a site that can sell this diode.
Thanks for all the help
Regards
 

CocaCola

Apr 7, 2012
3,635
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3,635
It's an obsolete part or large volume OEM part, you will need to compare specs and find a suitable consumer replacement...

Note that it's two diodes if that is indeed the chip you need, so you might want to see if you need both diodes, if not and even if, it might be a LOT easier to source two small SMD MELF (opr mini-MELF) package diodes and make them fit as 500mA in the SOT23 package appears hard to source...
 
Last edited:

dsb79

Sep 7, 2012
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CocaCola, how can i see if i need the two diodes. I have digital multimeter put on diode test

Figure 1 - Measures taken from bad diode
| Leg 3
|
|-------------|
|-------------|
/ \
Leg 1 Leg 2
Figure 1

From Leg 1 to Leg 3 - Open circuit
From Leg 1 to Leg 2 - a small resistance .344
From Leg 2 to Leg 3 - a small resistance .364


Figure 2 - Measures taken from good diode D052
| Leg 3
|
|-------------|
|-------------|
/ \
Leg 1 Leg 2
Figure 2

From Leg 1 to Leg 3 - 1
From Leg 1 to Leg 2 - 1
From Leg 2 to Leg 3 - a small resistance .387

Can this tell me, what i need, i dont know how can i measure mA .

I have seen this item in ebay http://www.ebay.com/itm/Doides-Inc-...638?pt=LH_DefaultDomain_0&hash=item25647c873e

Regards.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Ar the readings from the "bad" one taken in circuit or out of circuit?

And you need to test each pair of pins each way with the diode test function.

Let's say the first lead mentioned is connected to the red probe. You need to do:

1, 2
2, 1
1, 3
3, 1
2, 3
3, 2

edit: that device on ebay is nothing like the part that CocaCola identified.
 

CocaCola

Apr 7, 2012
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If the part is 'bad' you are not going to get conclusive readings from it...

I would trace back the pads for the component and see if they are actually going somewhere, if one is floating than you only need a single diode, if unsure just get two...

Heck get two anyway as it's going to cost you what 10¢ extra, and you don't have to test or worry about it?

BTW my identified part is just an educated guess, at the part... It's a probable conclusion based on the stamped number, but not a guarantee unless you can identify the actual manufacture and verify that they did house stamp that type of diode it D052...
 

dsb79

Sep 7, 2012
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The readings where taken from a bad and a good one on the circuit board.

The readings from the bad are:
1,2 0.340
2,1 0.340
1,3 open
3,1 open
2,3 0.340
3,2 0.340

The readings from a good one are:
1,2 1
2,1 0.967
1,3 0.367
3,1 0.367
2,3 1
3,2 0.749

Regards.
 
Last edited:

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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If taken in-circuit, the figures are pretty much meaningless.

Neither show much diode action, and that could be because both are toast, or because the (different -- presumably) circuit is masking out any information.
 

dsb79

Sep 7, 2012
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Hi, i think i need the HSMP-3800 diode, i have reach this conclusion by going to this web site http://www.marsport.org.uk/smd/mainframe.htm from there i have click on letter D and from the table i saw D0 that points to this HSMP-3800 diode.
The diode that is damage has in the package D052 i cannot find this D052 any where so i made the assumption that this code is from a manufacture, and from the link above i have reach this datasheet http://www.datasheetarchive.com/HSMP-3800-datasheet.html. My question is , it is safe to buy this diode and replace by the bad one. if not i don't make the move.

Regards.
 

CocaCola

Apr 7, 2012
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My question is , it is safe to buy this diode and replace by the bad one.

If you have a 'good' diode I would remove it from circuit and do some more testing and try to get a better idea of what's inside... Do this for both the bad and good one and see if anything varies... Testing in circuit any variance could very well be due to the effects of the rest of the circuit and other components...
 

dsb79

Sep 7, 2012
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I forgot to mention a small detail the bad diode is bad because it has blown up.I am going to take the good one and see what meausers.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Yeah, that does sound like common cathode.

However I don't agree with your decision as regards the marking.

What we really need to know is what package the device is in, and what job it is doing. If it has failed catastrophically, chances are that it is not the original fault, but collateral damage from he real fault.

Can you get us an image of the board, and of the device, or a similar one so we can determine the package. The images need to be nice and sharp (so we can read the writing on the components) and preferably have something to indicate scale (or a measurement of the device).

From the way you're drawing it, I suspect it might be a SOT-23 device. You can look that up and tell me if the dimensions match.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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OK, the thing that worries me is that these devices seem to be connected up to an external interface. They*could* be protection devices of some sort, however the wiring to them does not suggest this is the case.

It may be worth trying something simple like this.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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yeah, shipping can be a killer.

Those ebay ones look right.
 

dsb79

Sep 7, 2012
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Hi steve i have replace the bad diode but no luck the battery wont charge and the laptop with the battery on does't turn on
 
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