On Thu, 17 Dec 2009 17:15:53 -0800, "Joel Koltner"
<zapwireDASHgroups@yahoo.com> wrote:
>"Joerg" <invalid@invalid.invalid> wrote in message
>news:7ovvgnFrfeU1@mid.individual.net...
>> That one is pretty low noise but at 20 cents incredibly expensive :-)
>
>You'll recall that Phil is from the optics world... :-)
Yup. The c-b junction makes a low-capacitance fA-leakage diode.
John
Reply by Joel Koltner●December 17, 20092009-12-17
"Joerg" <invalid@invalid.invalid> wrote in message
news:7ovvgnFrfeU1@mid.individual.net...
> That one is pretty low noise but at 20 cents incredibly expensive :-)
You'll recall that Phil is from the optics world... :-)
Reply by Bill Sloman●December 17, 20092009-12-17
On Dec 17, 11:38=A0pm, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:
> On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim William=
I used a few BFR96 back in 1989-91, but we mostly used the BFR92 (NPN)
and the BFT92 (PNP) where we needed some speed, always with around 33R
(or thereabouts) of base-stopper, right up against the base.
Cheap, easy to buy (Farnell) and tolerably quick.Won't take much
reverse bias across the base.
--
Bill Sloman, Nijmegen
Reply by Joerg●December 17, 20092009-12-17
John Larkin wrote:
> On Thu, 17 Dec 2009 12:33:30 -0600, "Tim Williams"
> <tmoranwms@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.
>
I always keep a (large) vial of those in stock here, just like we do
with Sierra Nevada Pale Ale. Not sure why Tim absolutely wants
thru-hole, SOT23 is easy to solder onto experimental board. Problem with
thru-hole is that anything fast almost needs to be soldered down with
its can like they did on old UHF tuner. And the market for that stuff is
gone.
> BFT25, Phil Hobbs' favorite transistor, is remarkable too.
>
That one is pretty low noise but at 20 cents incredibly expensive :-)
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
Reply by John Larkin●December 17, 20092009-12-17
On Thu, 17 Dec 2009 12:33:30 -0600, "Tim Williams"
<tmoranwms@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
Reply by Jan Panteltje●December 17, 20092009-12-17
On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim Williams"
<tmoranwms@charter.net> wrote in <hge5uk$qh8$1@news.eternal-september.org>:
BTW, here are the (LT) spice models for BFR91 and BFR96:
.MODEL BFR91 NPN ( BF=101 VAF=96 VAR=9.6 RC=9 RB=5
+RE=.149 IKF=0.25E-01 ISE=0.32E-14 TF=0.178E-10
+TR=0.13E-08 ITF=0.40E-01 VTF=0.40E+01 CJC=1.271E-12
+CJE=2.361E-12 XTI=3.0 NE=1.5 ISC=0.11E-14 EG=1.11
+XTB=1.5 BR=2.63 VJC=0.75 VJE=0.75 IS=0.35E-15
+MJC=0.33 MJE=0.33 XTF=4.0 IKR=0.25E-01 KF=0.1E-14
+NC=1.7 FC=0.50 RBM=3.5 IRB=0.35E-02 XCJC=0.5 )
.MODEL BFR96 NPN ( BF=99 VAF=120 VAR=12.0 RC=6.1 RB=2.7
+RE=.029 IKF=0.70E-01 ISE=0.90E-14 TF=0.178E-10
+TR=0.13E-08 ITF=0.67E-01 VTF=0.50E+01 CJC=1.854E-12
+CJE=1.709E-12 XTI=3.0 NE=1.5 ISC=0.30E-14 EG=1.11
+XTB=1.5 BR=2.57 VJC=0.75 VJE=0.75 IS=0.10E-14
+MJC=0.33 MJE=0.33 XTF=4.0 IKR=0.70E-01 KF=0.1E-14
+NC=1.7 FC=0.50 RBM=1.9 IRB=0.10E-01 XCJC=0.5 )
I have appended these to standard.bjt
Reply by Jan Panteltje●December 17, 20092009-12-17
On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim Williams"
<tmoranwms@charter.net> wrote in <hge5uk$qh8$1@news.eternal-september.org>:
>"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
>news:hge1ti$c8t$1@news.albasani.net...
>> BFR91, 20V Vcb, but only 12 V Vce, 50 mA, 2GHz.. low Ccb .5 pF, Cce .3 pF
>> can be used trough hole and surface mount, seems stable here....
>
>Ewww, TO-50. Hmm, Vishay claims 5GHz, planar ground a must. And like most
>RF parts, it lacks DC parameters...
>
>Yeah, stable at what frequency and bandwidth? 800MHz, or wideband? ;-)
> 2N2369 is an old standby... kind of high current (200mA), like a '3904 sped
> up about 2-3 times. Not well specified though, I suppose because it's so
> old. I'm thinking in the 20V, 50mA range, fT maybe 0.5-1GHz. Like if you
> wanted to make old school RTL circuits that run as fast as 74S TTL. MPSH11
> looks good, and '81 looks like its complement. I've used PN3563 before
> (complement PN4258? unobtainium?).
>
> Any favorites?
>
> I'm not looking for SMTs or anything over 3GHz. I'm still exploring the
> through-hole era, where it helps if the transistor doesn't oscillate on its
> own legs. :)
>
On Thu, 17 Dec 2009 14:55:17 -0600, "Tim Williams"
<tmoranwms@charter.net> wrote:
>"Jim Thompson" <To-Email-Use-The-Envelope-Icon@My-Web-Site.com/Snicker>
>wrote in message news:d30li5tlibm4aeivqborme6m65e1s3svtg@4ax.com...
>> 2N2369 is a GOLD-DOPED device designed primarily for low-storage-time
>> switching
>
>Yup.
>
>Is that all you had to say, your sentence seems to end suddenly?
I was going to opine that it probably wasn't all that good for RF, but
decided I wasn't sure about that ;-)
>
>What's your favorite, Jim? And don't say InP monolithic, because that
>doesn't count. ;-)
>
>Tim
XFAB XB06 BiCMOS process QNBROA (NPN ;-)
...Jim Thompson
--
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Reply by Tim Williams●December 17, 20092009-12-17
"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
news:hge1ti$c8t$1@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? ;-)
Tim
--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms