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For a better experience, please enable JavaScript in your browser before proceeding. Thread starter Analog Start date May 27, Analog New Member May 27, So after they came in, the amplifier did not work, set even to its lowest bias.

Every single acted like it was always on, regardless of its Vgs. I checked another five of these and they were all like that. I guess it makes sense that they sell the n-channel version so cheaply, in fact, nobody in the industry comes close! They seem to be junk, so buyers beware! Speakerguy Active Member May 27, I got some IRF’s there for cheap. I thought it might have been too cheap.

I’ll have to try them and see I guess. HarveyH42 Banned May 27, Have you Emailed Futurlec with this? It would do them and everyone else a service to let them know about these parts.

If they got a large quantity, they would have a chance to correct the problem before it gets too big.


They might also replace your parts, give a refund datwsheet credit. Might take some time and patience, they aren’t the quickest or most talkative, but have only read a few datassheet where they absolutely refused to do anything. I maybe order from times a year, about 5 years now, never a quality issue, usually exceed my expectations. If they were crooked, pretty sure I’d have seen something suspicious over the years Any chance they might have gotten their grubby hands in the parts bin?

Haven’t used a lot of fets, my instructor in High School scared the crap out of me irr1310 all the talk about how fragile they are, and how easy they are to damage, all the special care in handling and installing, ect Not sure how real all that was, but have been finding that they aren’t so bad perhaps I’m over cautious.

FET’s these days are pretty rugged. I’ve tossed them around a lot without any caution regarding ESD and I haven’t ever had a Datxsheet fail that wasn’t in response to me catching it on fire. I think this is one of those things they more or less fixed within the last decade.

Oznog Active Member May 27, A negative Vgs positive for P-ch will ensure they are completely off. Review the spec sheet.

IRF1310N MOSFET. Datasheet pdf. Equivalent

Most are Enhancement mode, I was trying to point out that the 2SK has the unusual feature of no significant threshold knee.

This is probably a silly question, but are you sure you had zero volts on Vgs shortednot just left floating, and didn’t get the pins mixed up? The people to contact would be the part manufacturer. Future Electronics generally deals in parts from active manufacturers, not surplus or no-name, but I wouldn’t talk to Future, you’d just get a sales person with no ability to investigate your problem.


IRF – IRF part cross-reference datasheet –

The mfg should have a vatasheet who should investigate bad parts. I could not find 2sk on Future Electronics website at all. The datasheet does not have spec’s for the max current when the Vgs is zero.

Every other manufacturer does. Two graphs show a typical current of zero when the Vgs is zero. I believe you are confusing Future Electronics with the company Futurlec, which is completely different.

Analog New Member May 28, Thanks to all that replied. I am going to buy some of the s from other sources, and I’ll let you know how they pan out.

Oznog Active Member May 28, The Mosfets are probably “seconds” that do not meet spec’s. Are the parts labeled? Is it possible that you received P-channel devices instead of N-channel?

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