Favorite jellybean ~HF BJT?

2N2369 is a GOLD-DOPED device designed primarily for low-storage-time switching ...Jim Thompson

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| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
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On a sunny day (Thu, 17 Dec 2009 12:33:30 -0600) it happened "Tim Williams" wrote in :

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....

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

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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

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I was going to opine that it probably wasn't all that good for RF, but decided I wasn't sure about that ;-)

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     |
             
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Well, not much to write home about but slim pickens if you don't want SOT23:

Characteristics similar to:

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Regards, Joerg

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On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim Williams" wrote in :

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?

On a sunny day (Thu, 17 Dec 2009 14:58:51 -0600) it happened "Tim Williams" wrote in :

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

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

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.

That one is pretty low noise but at 20 cents incredibly expensive :-)

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s"

7

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

You'll recall that Phil is from the optics world... :-)

Yup. The c-b junction makes a low-capacitance fA-leakage diode.

John