Favorite jellybean ~HF BJT?
in [Design]
|
Prev: One zener diode vs two standard diodes for overvoltage protection of low-level voltage (analog and data) lines...
Next: Learning Mosfets...RdsON Warm Up?
From: Tim Williams on 17 Dec 2009 13:33 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 -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Jim Thompson on 17 Dec 2009 14:04 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 2N2369 is a GOLD-DOPED device designed primarily for low-storage-time switching ...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: Jan Panteltje on 17 Dec 2009 14:47 On a sunny day (Thu, 17 Dec 2009 12:33:30 -0600) it happened "Tim Williams" <tmoranwms(a)charter.net> wrote in <hgdte2$1tr$1(a)news.eternal-september.org>: >2N2369 is an old standby... kind of high current (200mA), like a '3904 sped >up about 2-3 times. Not well specified though, I suppose because it's so >old. I'm thinking in the 20V, 50mA range, fT maybe 0.5-1GHz. Like if you >wanted to make old school RTL circuits that run as fast as 74S TTL. MPSH11 >looks good, and '81 looks like its complement. I've used PN3563 before >(complement PN4258? unobtainium?). > >Any favorites? > >I'm not looking for SMTs or anything over 3GHz. I'm still exploring the >through-hole era, where it helps if the transistor doesn't oscillate on its >own legs. :) > >Tim > >-- >Deep Friar: a very philosophical monk. >Website: http://webpages.charter.net/dawill/tmoranwms > BFR91, 20V Vcb, but only 12 V Vce, 50 mA, 2GHz.. low Ccb .5 pF, Cce .3 pF can be used trough hole and surface mount, seems stable here....
From: Tim Williams on 17 Dec 2009 15:55 "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> wrote in message news:d30li5tlibm4aeivqborme6m65e1s3svtg(a)4ax.com... > 2N2369 is a GOLD-DOPED device designed primarily for low-storage-time > switching Yup. Is that all you had to say, your sentence seems to end suddenly? What's your favorite, Jim? And don't say InP monolithic, because that doesn't count. ;-) Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Tim Williams on 17 Dec 2009 15:58
"Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message news:hge1ti$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? ;-) Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |