Favorite jellybean ~HF BJT?
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From: Jim Thompson on 17 Dec 2009 16:41 On Thu, 17 Dec 2009 14:55:17 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> >wrote in message news:d30li5tlibm4aeivqborme6m65e1s3svtg(a)4ax.com... >> 2N2369 is a GOLD-DOPED device designed primarily for low-storage-time >> switching > >Yup. > >Is that all you had to say, your sentence seems to end suddenly? I was going to opine that it probably wasn't all that good for RF, but decided I wasn't sure about that ;-) > >What's your favorite, Jim? And don't say InP monolithic, because that >doesn't count. ;-) > >Tim XFAB XB06 BiCMOS process QNBROA (NPN ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Help save the environment! Please dispose of socialism properly!
From: Joerg on 17 Dec 2009 16:58 Tim Williams wrote: > 2N2369 is an old standby... kind of high current (200mA), like a '3904 sped > up about 2-3 times. Not well specified though, I suppose because it's so > old. I'm thinking in the 20V, 50mA range, fT maybe 0.5-1GHz. Like if you > wanted to make old school RTL circuits that run as fast as 74S TTL. MPSH11 > looks good, and '81 looks like its complement. I've used PN3563 before > (complement PN4258? unobtainium?). > > Any favorites? > > I'm not looking for SMTs or anything over 3GHz. I'm still exploring the > through-hole era, where it helps if the transistor doesn't oscillate on its > own legs. :) > Well, not much to write home about but slim pickens if you don't want SOT23: http://www.fairchildsemi.com/ds/2N/2N5770.pdf Characteristics similar to: http://www.fairchildsemi.com/ds/MM/MMBT918.pdf -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jan Panteltje on 17 Dec 2009 17:18 On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim Williams" <tmoranwms(a)charter.net> wrote in <hge5uk$qh8$1(a)news.eternal-september.org>: >"Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message >news:hge1ti$c8t$1(a)news.albasani.net... >> BFR91, 20V Vcb, but only 12 V Vce, 50 mA, 2GHz.. low Ccb .5 pF, Cce .3 pF >> can be used trough hole and surface mount, seems stable here.... > >Ewww, TO-50. Hmm, Vishay claims 5GHz, planar ground a must. And like most >RF parts, it lacks DC parameters... > >Yeah, stable at what frequency and bandwidth? 800MHz, or wideband? ;-) I am using it as variable cap to tune a xtal osc in a camera. no special decoupling ftp://panteltje.com/pub/PAL_camera_freq_control_img_1600.jpg If your layout is sane, why should it oscillate? > >Tim > >-- >Deep Friar: a very philosophical monk. >Website: http://webpages.charter.net/dawill/tmoranwms > > >
From: Jan Panteltje on 17 Dec 2009 17:38 On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim Williams" <tmoranwms(a)charter.net> wrote in <hge5uk$qh8$1(a)news.eternal-september.org>: BTW, here are the (LT) spice models for BFR91 and BFR96: ..MODEL BFR91 NPN ( BF=101 VAF=96 VAR=9.6 RC=9 RB=5 +RE=.149 IKF=0.25E-01 ISE=0.32E-14 TF=0.178E-10 +TR=0.13E-08 ITF=0.40E-01 VTF=0.40E+01 CJC=1.271E-12 +CJE=2.361E-12 XTI=3.0 NE=1.5 ISC=0.11E-14 EG=1.11 +XTB=1.5 BR=2.63 VJC=0.75 VJE=0.75 IS=0.35E-15 +MJC=0.33 MJE=0.33 XTF=4.0 IKR=0.25E-01 KF=0.1E-14 +NC=1.7 FC=0.50 RBM=3.5 IRB=0.35E-02 XCJC=0.5 ) ..MODEL BFR96 NPN ( BF=99 VAF=120 VAR=12.0 RC=6.1 RB=2.7 +RE=.029 IKF=0.70E-01 ISE=0.90E-14 TF=0.178E-10 +TR=0.13E-08 ITF=0.67E-01 VTF=0.50E+01 CJC=1.854E-12 +CJE=1.709E-12 XTI=3.0 NE=1.5 ISC=0.30E-14 EG=1.11 +XTB=1.5 BR=2.57 VJC=0.75 VJE=0.75 IS=0.10E-14 +MJC=0.33 MJE=0.33 XTF=4.0 IKR=0.70E-01 KF=0.1E-14 +NC=1.7 FC=0.50 RBM=1.9 IRB=0.10E-01 XCJC=0.5 ) I have appended these to standard.bjt
From: John Larkin on 17 Dec 2009 18:59
On Thu, 17 Dec 2009 12:33:30 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >2N2369 is an old standby... kind of high current (200mA), like a '3904 sped >up about 2-3 times. Not well specified though, I suppose because it's so >old. I'm thinking in the 20V, 50mA range, fT maybe 0.5-1GHz. Like if you >wanted to make old school RTL circuits that run as fast as 74S TTL. MPSH11 >looks good, and '81 looks like its complement. I've used PN3563 before >(complement PN4258? unobtainium?). > >Any favorites? > >I'm not looking for SMTs or anything over 3GHz. I'm still exploring the >through-hole era, where it helps if the transistor doesn't oscillate on its >own legs. :) > >Tim I like BFS17. It plenty fast but not so fast that it oscillates all on its own, like many parts do. It is surface mount, which keeps the parasitics down. BFT25, Phil Hobbs' favorite transistor, is remarkable too. John |