Favorite BJT transistors, sot-23 and TO-92 equivalents - I
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From: Winfield Hill on 31 Jan 2010 20:00 John Larkin wrote... > > Are you going to mention MMICS somewhere else? Some of them make > radical wideband amps, even pulse amplifiers, so are options to > replace discretes and opamps. They tend to be very stable. OK, we're fans as well, they'll go into 2x. -- Thanks, - Win
From: Hammy on 31 Jan 2010 20:20 On 31 Jan 2010 14:15:03 -0800, Winfield Hill <Winfield_member(a)newsguy.com> wrote: > > Here's what I have so far in the condensed table: > >NPN PNP >TO-92 SOT-23 TO-92 SOT-23 >2N3904 MMBT3904 2N3906 MMBT3906 >2N4401 MMBT4401 2N4403 MMBT4403 >BC337 BC817 BC327 BC807 >2N5089 MMBT5089 2N5087 MMBT5087 >BC547C BC847C BC557C BC857C >MPSA14 MMBTA14 MPSA64 MMBTA64 >ZTX618 FMMT618 ZTX718 FMMT718 >PN2369 MMBT2369 2N5771 MMBT5771 >2N5550 MMBT5550 2N5401 MMBT5401 >MPSA42 MMBTA42 MPSA92 MMBTA92 >MPS5179 BFS17 > BFT92 BFT93 >TIP142 TIP147 > > with performance details in columns off to the right. Here's a couple of On Semi's low Vce sat bjt's.They are a little pricey but still cheaper then diodes comparable FMMT series. The only reason I have them is Newark puts them on sale time to time like right now I see. NSS40201LT1G - NPN 40V 4A SOT-23 http://www.onsemi.com/pub/Collateral/NSS40201L-D.PDF Complement NSS40200LT1G- -PNP 40V 4A SOT-23 http://www.onsemi.com/pub_link/Collateral/NSS40200L-D.PDF Two more of On semis low Vce sat bjt's I have are below . They are SOT-223 though. Reasonably priced to. NJT4031N - NPN 40V 3A SOT-23 http://www.onsemi.com/pub/Collateral/NJT4031N.PDF Complement NJT4030P - PNP 40V 3A SOT-23 http://www.onsemi.com/pub_link/Collateral/NJT4030P-D.PDF
From: Winfield Hill on 31 Jan 2010 21:31 Hammy wrote... > > Here's a couple of On Semi's low Vce sat bjt's.They are a little > pricey but still cheaper then diodes comparable FMMT series. The only > reason I have them is Newark puts them on sale time to time like right > now I see. > > NSS40201LT1G - NPN 40V 4A SOT-23 > http://www.onsemi.com/pub/Collateral/NSS40201L-D.PDF > > Complement > NSS40200LT1G- -PNP 40V 4A SOT-23 > http://www.onsemi.com/pub_link/Collateral/NSS40200L-D.PDF > > Two more of On semis low Vce sat bjt's I have are below. > They are SOT-223 though. Reasonably priced to. > NJT4031N - NPN 40V 3A SOT-23 > http://www.onsemi.com/pub/Collateral/NJT4031N.PDF > > Complement > NJT4030P - PNP 40V 3A SOT-23 > http://www.onsemi.com/pub_link/Collateral/NJT4030P-D.PDF Very nice, I like the ON Semi parts, and the way they go out of their way to give you decent datasheets. Unlike Zetex, who often makes you do with one page. Have you noticed the way these parts present you with Rds(on) values? Like 80 m-ohms for the NSS40200? I like that. Sure, trying to compare to a MOSFET, but hey, characterizing the high-current saturation-voltage upswing as a resistance is really the right way to go. Doing a quick look right now, I couldn't even find a sot-23 MOSFET with Rds(on) = 0.08 ohms or less (they were bigger), let alone one going for $0.90 each, qty 100. Nice. -- Thanks, - Win
From: Okkim Atnarivik on 1 Feb 2010 09:51 John Larkin <jjlarkin(a)highnotlandthistechnologypart.com> wrote: : On 31 Jan 2010 16:10:06 -0800, Winfield Hill : <Winfield_member(a)newsguy.com> wrote: : > : > Even with damping resistors? E.g., EF outputs look : > like an inductor, due to the falling beta (assuming : > a low source impedance). L = Rs / 2pi fT, above : > the breakpoint frequency, f = fT r_e / Rs. That : > output inductance resonates with capacitive loads, : > but a damping resistor can keep Q = 1 max. : : like to oscillate with hot transistors, like the zillion-GHz NEC parts : for example. By the time you add enough base resistance to calm them : down, you may as well have used a slower transistor. There is one place for those fast transistor, tranquilized by GHz damping circuits close to the transistor: when you need very low noise at intermediate frequencies. As an instance, the voltage noise of the SiGe BFP650 can be less than 1/4 nanovolt. An example spectrum is found in fig.4 of www.24.fi/kiviranta/xeus/vtt_ltd13pap_f.pdf (now out in AIP Conf. Proc. vol. 1185) . NESG3031 is another nice device in this respect. Regards, Mikko
From: John Larkin on 1 Feb 2010 12:35
On Mon, 1 Feb 2010 16:51:39 +0200 (EET), Okkim Atnarivik <Okkim.Atnarivik(a)24.fi.invalid> wrote: >John Larkin <jjlarkin(a)highnotlandthistechnologypart.com> wrote: >: On 31 Jan 2010 16:10:06 -0800, Winfield Hill >: <Winfield_member(a)newsguy.com> wrote: >: > >: > Even with damping resistors? E.g., EF outputs look >: > like an inductor, due to the falling beta (assuming >: > a low source impedance). L = Rs / 2pi fT, above >: > the breakpoint frequency, f = fT r_e / Rs. That >: > output inductance resonates with capacitive loads, >: > but a damping resistor can keep Q = 1 max. >: >: like to oscillate with hot transistors, like the zillion-GHz NEC parts >: for example. By the time you add enough base resistance to calm them >: down, you may as well have used a slower transistor. > > There is one place for those fast transistor, tranquilized >by GHz damping circuits close to the transistor: when you need very >low noise at intermediate frequencies. As an instance, the voltage >noise of the SiGe BFP650 can be less than 1/4 nanovolt. An example >spectrum is found in fig.4 of www.24.fi/kiviranta/xeus/vtt_ltd13pap_f.pdf >(now out in AIP Conf. Proc. vol. 1185) . NESG3031 is another nice >device in this respect. > > Regards, > Mikko Cool. Fig 4 is impressive, but "base grounded" implies that it will be useful only for very low source impedances. Transformers get interesting in such situations, or *lots* of opamps or jfets in parallel, which will be better at low frequencies. John |