Favorite BJT transistors, sot-23 and TO-92 equivalents - I
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From: Bill Sloman on 1 Feb 2010 13:47 On Jan 31, 11:22 pm, John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: > On 31 Jan 2010 14:15:03 -0800, Winfield Hill > > > > <Winfield_mem...(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. > > Are you showing the BFT92 as an NPN? Or is it a posting wrap artifact? > It's a PNP. > > Packaged transistors with Ft's much above 1 GHz are hard to use... > they tend to oscillate in any circuit that's not intended to be an > oscillator. PHEMTs on the other hand usually behave pretty well. The BFR92 and BFR92A are the complements of the PNP BFT92. They all tend to oscillate, but putting a 33R "base-stopper" resistor in series with base (and close up against it) kills off most oscillations, without doing much damage to the high-frequency gain. -- Bill Sloman, Nijmegen
From: Robert Latest on 1 Feb 2010 14:30 Winfield Hill wrote: > Do IC fabs often use gold doping? I've never heard of that. I think gold and other alchemy is what keeps discretes fabs alive and kicking in ol' US and Europe. > (Yes, I know a > designer can use circuit schemes instead to reduce > storage time.) Are there other gold-doped discrete > transistors we should know about? I need to look, but I think NXP's 3904 and 3906 (complementary) are gold doped. The 3904 uses the same process as the BSR13, and I know that BSR13 has a gold doping step. robert
From: Robert Latest on 1 Feb 2010 14:35 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. Good call! NXP also have a similar line (called BISS), I don't know how they compare to ON's stuff. robert
From: Joerg on 1 Feb 2010 14:37 Winfield Hill wrote: > John Larkin wrote... >> >> Hi, Win! >> >> BCX70, BCX71; beta graded! >> >> 2N7002, as sub for BJT > I'd also throw the BSS84 for P-channel into the hat. It's my jelly-bean part. > Hah! > >> BFT25, as a transistor and as a diode. It's a better >> pA diode than a PAD1. > > Yep, very small die. > >> BFS17, fast but not too fast. > > What, no PNP equivalent? > I've got BFT92 and BFT93 in the table. > How does the BFT25 compare to the BFT92? > The BFT25 is NPN. Phil Hobbs should be able to give a good account on that one. While we're at it, what other categories do you need hints for? For example, for drivers con mucho gusto the MIC4421/22 series is great but hardly any young engineer knows about stuff like that. Oh, and tell readers not to blindly trust POR/BOR circuitry inside a uC ;-) Can't hurt to mention some of the budget rockets, like the BFP620, but with the usual caution notes (like that it might be oscillating without even noticing it, until a government van shows up ...): http://www.infineon.com/dgdl/bfp620.pdf?folderId=db3a30431400ef68011425b291f205c5&fileId=db3a30431400ef680114274deb27072a -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Hammy on 1 Feb 2010 15:14
On 1 Feb 2010 19:35:58 GMT, Robert Latest <boblatest(a)yahoo.com> wrote: >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. > >Good call! NXP also have a similar line (called BISS), I don't know how >they compare to ON's stuff. > >robert I think they all have low Vce sat BJT's now. For example Fairchild's got these; FSB560 NPN - 2A; 60V; SOT-23 http://www.fairchildsemi.com/ds/FS/FSB560A.pdf FSB660A PNP - 2A; 60V; SOT-23 http://www.fairchildsemi.com/ds/FS/FSB660A.pdf I've never used those two but they are cheap a dime for the NPN at Newark; the PNP isn't stocked. A quick search of Fairchild shows at least 6 low sat bjt's ranging from 1 amp to 3amps. Another decent one from Onsemi I have used and have is the MBT35200MT1 PNP - 2A; 35V; TSOP-6 http://www.onsemi.com/pub/Collateral/MBT35200MT1-D.PDF I do prefer On semis datasheets to Zetex/Diodes, and stateing the equivalent Rdson is a good idea for quick comparisons. |