Hi, I have an ACER 5820TG that only boots as far as the Acer logo and then shuts down. It won't boot again unless the AC plug is removed and re-inserted. I have found a mosfet that is faulty. It is AO4710. My question is can I use a Vishnay 4712 as a replacement? The data sheets are here http://www.vishay.com/docs/65170/si4712dy.pdf and here http://aosmd.com/pdfs/datasheet/AO4710.pdf. So that I don't have to ask in the future, can somebody tell me what the crucial parameters are? I know it has to be the same channel, voltage and dimensions but is there anything else I should look for on the data sheets? Grateful for help, as always.
Mosfet interchangeability-A4710 with 4712
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Re: Mosfet interchangeability-A4710 with 4712
Sorry, the link to the 4712 is here
http://www.vishay.com/docs/65170/si4712dy.pdf
Maybe I'll just do it! -
Re: Mosfet interchangeability-A4710 with 4712
I had to deal with just such a repair job...
You don't usually need to be worried about VgsTH as it's so variable (there, alone, it has a 250% tolerance -- most basic semiconductor properties are not well controlled.) Instead, compare RdsON vs Vgs; if the current device has x.x ohm at x.xV Vgs, you need to meet or go lower than that.
The AO4710 has a typical RdsON of 11.7 mOhms @ 4.5V 11A, while the Vishay si4712dy has a rating of 13 mohms @ 4.5V 10A. So the Vishay part is actually slightly inferior. If you tell me which site your ordering from, I might be able to find you something better.Comment
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Re: Mosfet interchangeability-A4710 with 4712
Thank you for that. I was starting to think nobody liked me, lol. impossible. I was actually going cheap and salvaging off a scrap motherboard. Now that I know a little more of what to look for I'll see what else is on my supply of dead MB's but I guess digikey would be one to buy from if tey sell in low qty. Mockingbird is this a similar repair to the one you did - an ACER 5820TG?Last edited by sparker1; 04-30-2013, 10:09 PM.Comment
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Re: Mosfet interchangeability-A4710 with 4712
No, I am repairing an old LCDTV. It uses the same package type (soic-8 or SOP-8), but it's unique in the sense that it has both an N-Channel and P-Channel MOSFET in one.
No need to buy anything really, I think the 4712 will be just fine.
I had to use two irons to remove the thing.Comment
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Re: Mosfet interchangeability-A4710 with 4712
Couldn't find one on the scrap boards. This one (AO 4410) looks like it would do http://www.ebay.com.au/itm/5PCs-ORIG...item589a6a8283. The specs are here http://aosmd.com/pdfs/datasheet/AO4410.pdf. It doesn't have a schottky diode only a plain one. Do you think there would be any problems?Last edited by sparker1; 04-30-2013, 11:55 PM.Comment
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Re: Mosfet interchangeability-A4710 with 4712
No, I am repairing an old LCDTV. It uses the same package type (soic-8 or SOP-8), but it's unique in the sense that it has both an N-Channel and P-Channel MOSFET in one.
No need to buy anything really, I think the 4712 will be just fine.
I had to use two irons to remove the thing.Comment
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Re: Mosfet interchangeability-A4710 with 4712
Just make sure not to rip off pads when you're removing it from the board you're repairing.
Add a blob of solder to both sides of legs (Being careful not to get it on nearby tiny SMD caps or resistors), heat the blobbed pins with soldering irons from both sides at the same time, lift off. Make sure not to drop it on the motherboard because if it falls on something while it has some molten solder attached to it, the solder could stick to something important on the board.
After, clean pads with wick, clean off flux residue making sure not to damage pads, and put in new SOP8/SOIC-8 package using the corner pin tack method.Comment
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Re: Mosfet interchangeability-A4710 with 4712
Just make sure not to rip off pads when you're removing it from the board you're repairing.
Add a blob of solder to both sides of legs (Being careful not to get it on nearby tiny SMD caps or resistors), heat the blobbed pins with soldering irons from both sides at the same time, lift off. Make sure not to drop it on the motherboard because if it falls on something while it has some molten solder attached to it, the solder could stick to something important on the board.
After, clean pads with wick, clean off flux residue making sure not to damage pads, and put in new SOP8/SOIC-8 package using the corner pin tack method.Comment
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