Does anyone have a suggestion for a transistor (npn pref) that has a higher GBW than a BC547 or 2N2222 at 2 - 10 ma?
High GBW jelly bean transistor
Sep 23, 2011
13 Replies
BFT25 is 5 GHz. Nice part. Interesting DC behavior, too: it makes a superb low-leakage diode.
BFS17 is only 1 GHz, but that can often be an advantage over something faster. It behaves itself pretty well.
John
My broad-band jelly-beans are the 5GHz NPN BFR92 and the PNP BFT93. I've never been able to keep them stable without a base-stopping resistor - someting like 22R in 0805 or smaller right up against the base pin - but with that addition they become very tractable.
-- Bill Sloman, Nijmegen
You don't say how much more BW you need, nor what the voltage limits are, nor minimum beta...If you just need a bit more BW, and not too much voltage the 2N5769 (aka 2N2369) family might work.
Many thanks. have plenty to look at
A word of caution: The hfe of RF transistors is generally lower than that of a BC547.
Regards, Joerg
http://www.analogconsultants.com/
apparently you meant f cutoff
2N5088 has higher GBW than 2N2222 (I think) at least the G is higherSMT part numbers are different.
that's OK. I'm just playing with a couple of home/hobby designs.
2N5770 are a nickel part with decent beta and GBW something a little over a gig.
Jim
Looks like those are headed towards "geriatronics". Even Digikey says "Part will become a non-stocking item when stock is depleted".
[...]
Regards, Joerg
http://www.analogconsultants.com/
Even Mouser says "End of Life".
MPSH10/81
Tim
-- Deep Friar: a very philosophical monk. Website:
formatting link
Or the SMT versions like KST10, MMBTH10.
Or MMBT5179 if you want > 1GHz.
They should all be < 3 cents apiece by the reel.
Best regards, Spehro Pefhany
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
I finally settled on the MPSH10 (pth) 10 cents each in retail one offs (how do you make money from selling that!) from futurelec. I'm thankful for all the suggestions.
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