legg wrote:> > On Fri, 15 Feb 2013 11:20:44 -0800 (PST), whit3rd <whit3rd@gmail.com> > wrote: > > >On Thursday, February 14, 2013 11:25:39 PM UTC-8, daku...@gmail.com wrote: > > > >> What is the minimum base current for the > >> 2N3055 ? The On Semi data sheet that I > >> downloaded is not very helpful. > > > >It's not a switching device, so the current into the base > >has a 'minimum' only in the sense that a hot device under > >bias leaks from the collector. So, to reliably turn OFF the > >transistor, you might need to sink 200 mA/beta > >at 25 C, 60Vce (that's circa 2 mA). > > That's Icbo to all you sports fans out there.Wasn't he traded to the minor leagues?
Mimimum base current for 2N3055
Started by ●February 15, 2013
Reply by ●February 16, 20132013-02-16
Reply by ●February 16, 20132013-02-16
On Friday, February 15, 2013 3:39:05 PM UTC-5, John Larkin wrote:> On Thu, 14 Feb 2013 23:25:39 -0800 (PST), dakupoto@gmail.com wrote: > > > > >Could some electronics guru please help ? > > >What is the minimum base current for the > > >2N3055 ? The On Semi data sheet that I > > >downloaded is not very helpful. Thanks in > > >advance for your help. > > > > If you're using the collector to switch some load on and off, at X > > amps, you need to jam in maybe X/20 or even X/10 amps into the base. > > Look at the data sheet for details. The more base current, the less > > "on" resistance of the collector switch action. > > > > Mosfets are easier to drive. Just apply some voltage (like 10v maybe) > > to the gate to turn them on, zero to turn them off. The gate current > > is minute. > > > > > > -- > > > > John Larkin Highland Technology, Inc > > > > jlarkin at highlandtechnology dot com > > http://www.highlandtechnology.com > > > > Precision electronic instrumentation > > Picosecond-resolution Digital Delay and Pulse generators > > Custom laser drivers and controllers > > Photonics and fiberoptic TTL data links > > VME thermocouple, LVDT, synchro acquisition and simulationThanks. As one of the other posters have noted, the specifications are pretty loose, in that most (like the one from On Semi) state that hfe varies between 20 - 70, and at hfe of 70, the collector current is 4.0 A, which is not very helpful. What you have said, is however a lot more concrete.
Reply by ●February 16, 20132013-02-16
On Friday, February 15, 2013 5:11:06 PM UTC-5, bloggs.fred...@gmail.com wrote:> On Friday, February 15, 2013 3:39:05 PM UTC-5, John Larkin wrote: > > > On Thu, 14 Feb 2013 23:25:39 -0800 (PST), dakupoto@gmail.com wrote: > > > > > > > > > > > > >Could some electronics guru please help ? > > > > > > >What is the minimum base current for the > > > > > > >2N3055 ? The On Semi data sheet that I > > > > > > >downloaded is not very helpful. Thanks in > > > > > > >advance for your help. > > > > > > > > > > > > If you're using the collector to switch some load on and off, at X > > > > > > amps, you need to jam in maybe X/20 or even X/10 amps into the base. > > > > > > Look at the data sheet for details. The more base current, the less > > > > > > "on" resistance of the collector switch action. > > > > > > > > > Finally someone who can actually understand the question.I fully agree.
Reply by ●February 17, 20132013-02-17
<dakupoto@gmail.com>>> >> Finally someone who can actually understand the question. > I fully agree. >** You are fully a fuckwit and a troll. Learn to write English properly or else FUCK OFF !!!! .... Phil
Reply by ●February 17, 20132013-02-17
<dakupoto@gmail.com>> As one of the other posters have noted, > the specifications are pretty loose, in that > most (like the one from On Semi) state that > hfe varies between 20 - 70, and at hfe of 70, > the collector current is 4.0 A, which is not > very helpful.** OK so you CANNOT read English either. You are quite wrong and you have no comprehension of the topic. Fuck off. ..... Phil
Reply by ●February 17, 20132013-02-17
On Sat, 16 Feb 2013 19:27:29 -0800 (PST), dakupoto@gmail.com wrote:>On Friday, February 15, 2013 3:39:05 PM UTC-5, John Larkin wrote: >> On Thu, 14 Feb 2013 23:25:39 -0800 (PST), dakupoto@gmail.com wrote: >> >> >> >> >Could some electronics guru please help ? >> >> >What is the minimum base current for the >> >> >2N3055 ? The On Semi data sheet that I >> >> >downloaded is not very helpful. Thanks in >> >> >advance for your help. >> >> >> >> If you're using the collector to switch some load on and off, at X >> >> amps, you need to jam in maybe X/20 or even X/10 amps into the base. >> >> Look at the data sheet for details. The more base current, the less >> >> "on" resistance of the collector switch action. >> >> >> >> Mosfets are easier to drive. Just apply some voltage (like 10v maybe) >> >> to the gate to turn them on, zero to turn them off. The gate current >> >> is minute. >> >> >> >> >> >> -- >> >> >> >> John Larkin Highland Technology, Inc >> >> >> >> jlarkin at highlandtechnology dot com >> >> http://www.highlandtechnology.com >> >> >> >> Precision electronic instrumentation >> >> Picosecond-resolution Digital Delay and Pulse generators >> >> Custom laser drivers and controllers >> >> Photonics and fiberoptic TTL data links >> >> VME thermocouple, LVDT, synchro acquisition and simulation > >Thanks. As one of the other posters have noted, >the specifications are pretty loose, in that >most (like the one from On Semi) state that >hfe varies between 20 - 70, and at hfe of 70, >the collector current is 4.0 A, which is not >very helpful. What you have said, is however >a lot more concrete.There is a term called "forced beta", which is the actual ratio of Ic/Ib used by design in a switching application. (Again, I assume we're talking about switching... are we?) If the transistor has a minimum datasheet HFE of 20 at 2 amps, we might decide to force Ic/10, namely 200 mA, into the base to turn it on hard and get the collector saturation voltage nice and low. That would be a forced beta of 10. I haven't used a 2N3055, or any big power bipolar, in a decade or two. Mosfets are easier to use. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●February 17, 20132013-02-17
On Sun, 17 Feb 2013 19:10:44 +1100, "Phil Allison" <phil_a@tpg.com.au> wrote:> ><dakupoto@gmail.com> > >> As one of the other posters have noted, >> the specifications are pretty loose, in that >> most (like the one from On Semi) state that >> hfe varies between 20 - 70, and at hfe of 70, >> the collector current is 4.0 A, which is not >> very helpful. > > >** OK so you CANNOT read English either. > >You are quite wrong and you have no comprehension of the topic. > >Fuck off. > >Don't you have a broken casette player or something to fix? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●February 17, 20132013-02-17
"John Larkin" "Phil Allison"><dakupoto@gmail.com> >> >>> As one of the other posters have noted, >>> the specifications are pretty loose, in that >>> most (like the one from On Semi) state that >>> hfe varies between 20 - 70, and at hfe of 70, >>> the collector current is 4.0 A, which is not >>> very helpful. >> >> >>** OK so you CANNOT read English either. >> >>You are quite wrong and you have no comprehension of the topic. >> >>Fuck off. >> > > Don't you have a broken casette player or something to fix?** Do you have any real life at all ? ( Blatantly rhetorical question ) Larkin is an incorrigible troll feeder and public cocksucker of any poster who laps up his crapology. Wot a fucking pathetic way to publicly bloat an already monstrous ego. What a fucking puke. .... Phil
Reply by ●February 17, 20132013-02-17
Phil Allison wrote:> <dakupoto@gmail.com> > >>>Finally someone who can actually understand the question. >> >>I fully agree. >> > > > ** You are fully a fuckwit and a troll. > > Learn to write English properly or else FUCK OFF !!!! > > > > .... Phil > >Phil is a perfect example of english etiquette, he's got the colorful metaphors of english down pat! Jamie
Reply by ●February 17, 20132013-02-17
John Larkin wrote:> On Sun, 17 Feb 2013 19:10:44 +1100, "Phil Allison" <phil_a@tpg.com.au> wrote: > > >><dakupoto@gmail.com> >> >>>As one of the other posters have noted, >>>the specifications are pretty loose, in that >>>most (like the one from On Semi) state that >>>hfe varies between 20 - 70, and at hfe of 70, >>>the collector current is 4.0 A, which is not >>>very helpful. >> >> >>** OK so you CANNOT read English either. >> >>You are quite wrong and you have no comprehension of the topic. >> >>Fuck off. >> >> > > > Don't you have a broken casette player or something to fix? > >That would be an 8 track! Jamie
