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...
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...
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.
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.
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...
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.
Ok Steve where is the url http://dl.dropbox.com/u/1267345/imagens/20120919_134711.jpg, there if you zoom you will see the diodes and what is print in the package(D052), this diode is used to charge the laptop battery, i think the battery is 11.1V and the charger is 20V.
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.