Epox EP-9NPA Ultra MOSFET

[Mithras]

Hello, I have a Problem with one of my Mosfets on an Epox Board.

The Problem ist, I brought the board from Ebay, and the Mosfet is more than a little bit damaged.


I just soldert this thing out, but the problem is I don`t know where to get a replacement part.

I marked the part on this picture:

http://www.meister-eck.de/ep.jpg

This is written on the part:

K3918
CG 58 (or maybe CG S8)


Would be great if you can help me with that.

Martin

[Rainbow]

Re: Epox EP-9NPA Ultra MOSFET

It should be 2SK3918:
http://www.necel.com/cgi-bin/nesdis/...918&doccode=DS

[PeteS in CA]

Re: Epox EP-9NPA Ultra MOSFET

The 2SK3918 is made by NEC, and is a proprietary P/N. If NEC parts aren't readily available to you, you could cross it to parts from IR, Fairchild, or STMicroelectronics. The key parameters are: V(DSS) = 25V; I(Continuous) Max = 48A; R(D-S On) = .0075 ohm max.; and C(iss) = 1300pF. 25 or 30V would suffice; somewhat higher than 48A would be OK; lower than .0075 ohm would be OK; less than 2000pF would probably be OK, lower than 1300pf would be preferred.

[Tom41]

Re: Epox EP-9NPA Ultra MOSFET

Slightly off-topic, but what are those things on the motherboard that look like miniature PCI slots? There are three of them near the ATX power connector.

[Shroomie]

Re: Epox EP-9NPA Ultra MOSFET

Think they're PCI Express x1 slots. That's a PCIe x16 video card slot, so...

[Rainbow]

Re: Epox EP-9NPA Ultra MOSFET

Yes, useless PCI express slots as there are almost no cards you can put in.

[Mithras]

Re: Epox EP-9NPA Ultra MOSFET

well, I`ve tried to find the SK3918 nearly everywhere, or something similar, but it looks like that there is no german shop that has this mosfet. Does anyone know a good shop in Europe/Germany that has such Mosfets?

[kc8adu]

Re: Epox EP-9NPA Ultra MOSFET

well, I`ve tried to find the SK3918 nearly everywhere, or something similar, but it looks like that there is no german shop that has this mosfet. Does anyone know a good shop in Europe/Germany that has such Mosfets?

sk3918 is a rca sk replacement and likely an entirely different part than you need.
2sk3918!

[Mithras]

Re: Epox EP-9NPA Ultra MOSFET

I`m sorry i meant the 2SK3918....

[gonzo0815]

Re: Epox EP-9NPA Ultra MOSFET

Try to look at www.reichelt.de, www.pollin.de or www.segor.de
You may find some compatibel devices there.

www.rsonline.de will have may be more choice, but a little more expensive.

[Mithras]

Re: Epox EP-9NPA Ultra MOSFET

https://cdn.badcaps-static.com/pdfs/...aad62025ae.pdf

Thats the best one I could find.. damn...

[PeteS in CA]

Re: Epox EP-9NPA Ultra MOSFET

I received your PM, Mithras, and it looks like the best choice through Digi-Key here in the US would be D-K P/N IRF3709ZS-ND. It's gate capacitance is a bit high, 2130pF. On the other hand, its R(DS On) is lower, so the extra losses from the higher gate capacitance may be balanced by the lower (I^2)(R) loss.

[Mithras]

Re: Epox EP-9NPA Ultra MOSFET

i`ll try this one, thank you man!

[PeteS in CA]

Re: Epox EP-9NPA Ultra MOSFET

Digi-Key doesn't list it, but Fairchild's FDB8870 looks to be close to the original - about the same R(DS On), 1700pF gate capacitance, rated for slightly higher current.

[Rainbow]

Re: Epox EP-9NPA Ultra MOSFET

As it's not exact replacement, I'd replace all 3 MOSFETs so they will be the same.

[PeteS in CA]

Re: Epox EP-9NPA Ultra MOSFET

Good point, Rainbow. In PMs I suggested several other parts, two from STMicro and two from Infineon. I wasn't aware, when I posted above, that Mithras is from Germany. STMicro and Infineon might be more available to him than IR (OTOH, he has a contact in the US, hence the D-K//IR recommendation above).

If anyone is curious, I could post the STMicro and Infineon P/Ns I suggested in the PMs.