Mosfets are they very sensitive?
what i mean to say that do they get destroy if i touch them with fingers?
I want to make amps using this but as far as this was my doubt and ive never laid my hands on this MOSFETS coz im afraid of destroying while handling that....
what do u say....?
what i mean to say that do they get destroy if i touch them with fingers?
I want to make amps using this but as far as this was my doubt and ive never laid my hands on this MOSFETS coz im afraid of destroying while handling that....
what do u say....?
In your case, I enter the site’s search engine and in the row
‘Search for items including these words:’ I would enter ‘mosfet static’. Then click below on 'Show results as posts', leave everything else alone and hit the ‘Perform search’ button.
Now try that, do some reading and report your findings.
/Hugo 🙂
‘Search for items including these words:’ I would enter ‘mosfet static’. Then click below on 'Show results as posts', leave everything else alone and hit the ‘Perform search’ button.
Now try that, do some reading and report your findings.
/Hugo 🙂
mosfets don't like static
Yes, mosfets are easily damaged by static, as are many modern devices. Sometimes the damage doesn't show up til the devices have been working for hours, days or months; the worst sort of damage.
It isn't hard to take precautions though - get yourself an antistatic mat and wristband, connect them and your soldering iron to earth and keep your cutters, pliers etc on the mat in between tweezes and snips.
http://tinyurl.com/4vl92
if that's too expensive, you could use a sheet of alumin(i)um foil on your table - proper antistatic mats are better though as they don't conduct enough to short low voltage circuits lying on the mat.
good luck, don't be scared!
Yes, mosfets are easily damaged by static, as are many modern devices. Sometimes the damage doesn't show up til the devices have been working for hours, days or months; the worst sort of damage.
It isn't hard to take precautions though - get yourself an antistatic mat and wristband, connect them and your soldering iron to earth and keep your cutters, pliers etc on the mat in between tweezes and snips.
http://tinyurl.com/4vl92
if that's too expensive, you could use a sheet of alumin(i)um foil on your table - proper antistatic mats are better though as they don't conduct enough to short low voltage circuits lying on the mat.
good luck, don't be scared!
Breman ur are very nice and u have good helping nature and ur not like Netlist. guy...who said that just go to google and try there...( ooooooooh we dont know that... aah ) ok NetList i think first before u post anything like this think that if anybody says this to you like go to google and search urself...
and one more thing if we get the all the answers at google then what is the need to come to the diy audio forums ? we ask u becoz we newbies we treat you like experts and genius people who have tons of experience and we think that u may give the right advice ... but uuuuuuu see how u are hurting newbies..
Just think about urself before posting something like this...
Be helpful in nature....
and one more thing if we get the all the answers at google then what is the need to come to the diy audio forums ? we ask u becoz we newbies we treat you like experts and genius people who have tons of experience and we think that u may give the right advice ... but uuuuuuu see how u are hurting newbies..
Just think about urself before posting something like this...
Be helpful in nature....
Don't blame me because I explained you how to search.
The power lies in the possession to find what you want and need. Helplessness is the opposite.
We could spoon-feed you all you want, in the end you will have learned nothing.
/Hugo
The power lies in the possession to find what you want and need. Helplessness is the opposite.
We could spoon-feed you all you want, in the end you will have learned nothing.
/Hugo
diysmartdeep21 said:
The nice Mr Netlist (and he is nice, if you would bother) was actually telling you how to search diyAudio not Google. So your point is in the garbage. Just try to use the search function of the forum before you post, that's all we ask. You may well be suprised at what turns up 🙂
Standing back and reading the flack that's going back and forth. To me I can see that the original question was a valid one and and a good thread starter.
Then on the other foot Netlist and richie00boy have a valid point also. Though they should not include the word (we) they should use (i)
I looked at this thread as a source of information, not to tell diysmartdeep21 to go search for himself.
So in future Netlist and richie00boy do'nt use (we) as i did'nt mind the original topic. Use (I).
Cheers All, George
Then on the other foot Netlist and richie00boy have a valid point also. Though they should not include the word (we) they should use (i)
I looked at this thread as a source of information, not to tell diysmartdeep21 to go search for himself.
So in future Netlist and richie00boy do'nt use (we) as i did'nt mind the original topic. Use (I).
Cheers All, George
Hi,
I have started to post a few questions on this forum and each time I have to confirm a search.
Well I have searched and found hundreds of references and even taken time to read many (I cannot claim most) and I have NEVER found what I needed to know. Maybe I am no good at searching the right phrases. Can someone give me lessons?
I've done it again, a question without a search (it's easier this way).
I have started to post a few questions on this forum and each time I have to confirm a search.
Well I have searched and found hundreds of references and even taken time to read many (I cannot claim most) and I have NEVER found what I needed to know. Maybe I am no good at searching the right phrases. Can someone give me lessons?
I've done it again, a question without a search (it's easier this way).
Both of the last two posts present very good point. This forum has so much accumulated information, that if we all were skilled in searching, there would be probably not much reason to start new threads.
So what, that something has been discussed already? Maybe the point was not made, or the new discussion will bring more light on a given subject. I also noticed that threads that were started 2 years ago, even when resurrected, for some reason never bring interesting discussion again. That's what threads are all about: they are being started, have certain lifespan, and then they die. The new ones (even when regarding same topics), are always different.
Getting back to the subject at hand, as long as you make sure that you will not produce static (like for instance you touch a grounded object before handling mosfets) and your working area is pretty much static free, you shouldn't have problem with touching the pins. I never managed to damaged a mosfet this way.
So what, that something has been discussed already? Maybe the point was not made, or the new discussion will bring more light on a given subject. I also noticed that threads that were started 2 years ago, even when resurrected, for some reason never bring interesting discussion again. That's what threads are all about: they are being started, have certain lifespan, and then they die. The new ones (even when regarding same topics), are always different.
Getting back to the subject at hand, as long as you make sure that you will not produce static (like for instance you touch a grounded object before handling mosfets) and your working area is pretty much static free, you shouldn't have problem with touching the pins. I never managed to damaged a mosfet this way.
In my experience, power MOSFETs and IGBTs with big die sizes and several nF input capacitances are very tolerant to moderate human body static discharges
However, small signal MOSFETs and CMOS ICs are not so tolerant, but they tend to include protective diodes internally
I've tested some power devices after handling them and soldering them without precautions and no gate leakage was measurable
Bigger gate structures are apparently capable of whitstanding bigger static discharges
However, small signal MOSFETs and CMOS ICs are not so tolerant, but they tend to include protective diodes internally
I've tested some power devices after handling them and soldering them without precautions and no gate leakage was measurable
Bigger gate structures are apparently capable of whitstanding bigger static discharges
MosFETs are prone to static damage. Often they will continue to work but will fail after some years. Two links:
Protecting IGBTs and MOSFETs from ESD:
http://www.irf.com/technical-info/appnotes/an-955.pdf
Electro Static Damage
Protecting IGBTs and MOSFETs from ESD:
http://www.irf.com/technical-info/appnotes/an-955.pdf
Electro Static Damage
I would accept Eva's evidence (#10) over those docs any day.
I've been periodically replacing lateral and also hexfet output devices for over 30 years yet never had a problem identified with initial or delayed gate damage. Pehaps that's due to service or assembly conditions where some techs may work in intrinsically ESD hazardous workplaces of plastic and other non-conductive materials with airconditioning. I don't and associates who work in unlined workrooms don't have problems that I'm aware of either.
I think the referred docs are cautionary stuff that may well apply in high risk workplaces - particularly electronic clean rooms and for hi-rel products generally. Obviously, IR don't want to be liable for the possibility of early failures and ESD precautions are the business of the second author. Of course, if you were reworking PC motherboards or running mass scale plants, all risks have to be nailed down to ensure profits.
YMMV as a DIY but I only consider the workplace and air dryness. Use the conductive bands and other gear if it makes you feel better but where protective diodes are already fitted or rel. humidity is over 65%, there is little point. Es Eva indicated, smaller mosfet devices such as memory and microprocessors will vary in greater sensitivity to ESD - some will require great care but probably O/T here.
I was working with IRF510 and IRF610 this morning. They both have quite low gate capacitance and would be more susceptible to damage. I have never damaged a power mosFET nor a jFET
I also untaped a pair of zvn2110a and checked them in the same circuit (cheapo quasimodo).
I did not damage either and I don't take any special precautions.
I just touch the back plate (drain) with the fingers of both hands to equalise voltages between me and the device.
I regularly get a "jolt" when adjusting volume or source in my sound system. That indicates that I have lowish humidity and highly insulating clothing/seats.
I also untaped a pair of zvn2110a and checked them in the same circuit (cheapo quasimodo).
I did not damage either and I don't take any special precautions.
I just touch the back plate (drain) with the fingers of both hands to equalise voltages between me and the device.
I regularly get a "jolt" when adjusting volume or source in my sound system. That indicates that I have lowish humidity and highly insulating clothing/seats.
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I would NEVER EVER suggest laying down foil, it's a bloody acident wating to happen! Matt/wristband eg person should have 1megΩ resistor inline with earth ground. Also those fancy schmancy antistatic topical solution type products work no better than fabric softener! We (place I worked once upon a time) tested this to be true. As with any aqueous topical treatment, they must be retreated in a few months or so. With 50 test benches fully equipped, with 90 techs and 20 engineers you can be sure we measured correctly. We did do NIST traceable calibrations at this facility (my dept).
Static very bad and the above comments are true. One place I worked (uggg) the owner refused to purchase even a wristband. He did buy a wristband for me after special ordering two special cmos pll's used in satellite receivers after having two destroyed and dealing with a pissed off commercial customer that had been promised two weeks earlier it would be done. Also some power mosfets/IGBT's are rather immune, but we here in audio land do not use such massively powerful devices. So take all precautions.
Static very bad and the above comments are true. One place I worked (uggg) the owner refused to purchase even a wristband. He did buy a wristband for me after special ordering two special cmos pll's used in satellite receivers after having two destroyed and dealing with a pissed off commercial customer that had been promised two weeks earlier it would be done. Also some power mosfets/IGBT's are rather immune, but we here in audio land do not use such massively powerful devices. So take all precautions.
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