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Log in or Sign up. The Gear Page is run by musicians for musicians. We’ve added some “new” guys to the moderator crew. All are longtime members that stepped up to the invite to help out by volunteering their time guz901 effort to help the membership experience on TGP stay on the even keel.

A special thank you to the ‘new’ guys that helping out. Aug 23, 1. Do these fail over time like a tube does datxsheet high power bass amps, for example? If the power rails, test points, and electrolytic caps all check out, what would cause one of these to fail? Aug 23, 2.

There are a zillion failure modes. The old transistors from the 60s and ICs from the 70s are probably the least reliable. New components have MTTF in the range of 10 years or longer under normal use. Here are some of the failure mechanisms: I bet this is what kills most power transistors, for example with wrong speaker load. Overheating, usually related to 1, but could be a heatsink issue.

Humidity — I’m not sure of the technical mechanisms, probably electrochemical, but early ICs did not take well to storing in hot humid conditions for years at at time. Early plastic packaged transistors had poor resistance to moisture. Electromigration — metal atoms actually move under influence of voltage causing opens or shorts after a time.

This is one of the main aging mechanisms, but is pretty minimal in modern transistors and ICs. Even background cosmic rays have been a problem with some ICs. I understand that this is pretty well under control now with modern components. Aug 23, 3. In my experience its a combination of things. In older equipment the thermal conduction between the device and the heatsink deteriorates over time and the device simply overheats and burns up.

Often there is conductive silicon goo that dries out. Other times the screw that holds the device to the heatsink gets loose. In other cases there is stress on the device leads that will break the connection within the device.

This is why you sometimes see transistors soldered in with a kink in the leads to allow for some expansion. This is more common on very high power, switchmode and RF circuits but any power amplifier can benefit.

Thirdly, some of the devices just fatigue and blow from their own internal stresses. And of course, the ever-popular shorted output can do it too. You can often tell the failure-mode by measuring the resistance between Emitter-Base, Base-Collector, Collector-Emitter. Aug 23, 4. WaltCAug 23, Aug 23, 5. Aug 23, 6. Aug 24, 7. Transistors do not “wear out” as tubes do, but they are relatively easily killed out of carelessness. Main problem in instrument amps is that 1 they get abused i.


That alone should tell you something. As a classical example, an old industry workhorse for ages was 2N Everybody and his brother used them starting with 70V; many using 80 or even 84V and a few going up to 90V and beyond. dataeheet

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Not surprisingly they fail often. In the MF they use four Fact is, if datqsheet design conservative such as old Traynors and many Peaveys, they last for ages. Problem is, Datashheet amps are not hardwired into an installation such as a Club or Theater or even Hi Fi system but are designed to be portable, meaning easily plugged in. Now, plugs are the WORST connector design in the World; datashheet only one which shorts itself while being plugged in or out.

They are long with a thin neck, easy to crack split if somebody steps on the cable sorry dude!! Bad cables, even improperly plugged ones halfway or perfectly good ones plugged while the amp is playing, all apply stressful shorts to output transistors.

No big deal you say? It’ll never reach that?

FI100439B – Switching power section with a hedge to limit the output voltage – Google Patents

J M FaheyAug 24, Aug 24, 8. I see many solid state Ampeg amps in for repairs because they have had the crap driven out of them or they are stuffed into a rack with a tuner and tons of cables all around them and they just plain slow-cook.

Then there’s the idiot that cranks his at the jam because it makes the speakers frap out in a ‘cool way’. His amp’s days are numbered. But my old Heath combo has been running for 30 years with me getting that killer fuzz tone when cranked so maybe they actually made transistors better in the old days? Lots of things to ponder. I buy Marshall output boards by the dozen.

Aug 25, 9. Aug 25, If it dies it happens pretty much for reasons already mentioned in this thread. Aug 26, In that case, its typically a Gate that’s blown through to the Source. Some have internal zenor diodes to provide the protection but its often not enough as some transient condition will blow it. Also Source to Drain shorting caused by over-current use isn’t rare.

FETs also should have a resistor in series with the Gate to limit instantaneous grid “current”, which can fatigue and blow the prior stage. Surprisingly many circuits don’t have this rather cheap insurance and you see output of ICs driving FETs directly blown as a result. Simple short answer is that solid state components don’t like heat. If a transistor starts drawing too much current, then heat is the result and the junction can fail.


StructoAug 26, Is there “preventive maintainence” that could extend the lifespan? Of course the obvious things like making sure fans are clean and working, keeping liquid and humidity out, etc.

Anybody do that or other manuvers you think helps? Sep 3, Never thought about replacing conductive paste, although you raise an interesting point here. I’d check that power transistors mounting screws are nice and tight; thermal cycling plus being smeared with grease helps loosening them in the long run.

That’s why I always apply a drop of nitro cement nail polish to them after assembly. J M FaheySep 3, Sep 4, They are not dying from heat as someone once pointed out to me they have an internal shutdown dataxheet they get too hot.

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So they must be blowing for some other reason. So I figured it must be the load. I usually warn customers to plug the amp to the speaker Before turning the amp on because as JMF said they were designed for home stereo use, where your speakers are always connected. But I still see them coming in blown, even in combo amps where the speaker is always connected.

So what do you think blows them? Are you meaning the TDAx series? They are very sensitive chips and likely have some kind of a design “flaw” that makes them more failure-prone than similar chips in general. They are at least prone to failing if the two supply pins for input and power stage do not stay in close voltage potential. The other TDA series chips with more conventional architecture e. I have personally wittnessed few failing in action, and yes, despite built-in thermal protection they DO fail to overheating, and it even could be their most usual failure mechanism.

Those things can get hot and more than often manufacturers skimp in heatsink size to save a few pennies; not to mention the total die area of the chip is not exactly comparable to that of an adequately designed discrete amp and ventilation schemes of many medium quality SS amps really suck.

I’ve wittnessed those chips heating the sink to too-hot-to-touch temperatures without the thermal protection even reacting.

I’ve also had a few fail due to vibration vibration as in the amp dropped to floor from about 1-meter height ; but in this case I think the vibration created a cold solder to a wrong pin, resulting into chip failure. Sep 7, Yes that’s the chips I’m talking about.

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