the ultimate PNP transistor

clicliclic · 2005-12-04T14:46:30+00:00

Hi,I am looking for a readily available PNP transistor in a through-holepackage with as small a collector-base ("Miller") capacitance aspossible. It is to be used for moderately fast saturated switching(t-onand t-off of a few 10ns) at low power (Ic about 1mA). Maximum collectorvoltage (9V battery) is no problem.I have tried the BF324 and BF450 (both Philips) with reasonableresults.The limiting factor here indeed appears to be the collector-basecapacitance: measured zero-bias values are ~3pF and ~2pF, respectively.Fast PNP switching transistors like the 700MHz 2N5771 are notautomatically better suited.So, what is the ultimate PNP transistor for this type of application?Issomething like the 5GHz BFT52 (Ccb ~ 1pF according to the Philips Spicemodel) still available in a through-hole package? Operation with E andCinterchanged may also be considered if the reverse beta exceeds five.TIA,Martin.

Dec 04, 2005 23 Replies

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Spehro Pefhany 20 years ago

Shoot, you're right.

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

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clicliclic 20 years ago

Winfield Hill schrieb:

There may be plenty (readily available? in a through-hole package?), but judging from the replies so far there isn't plenty of knowledge about them and their uses ... Dunno if that makes it important ...

Please take your time to recover from this shock. It's not _that_ important ...

Martin.

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Frank Bemelman 20 years ago

I actually thought it was another form of "Jesus". Like "Holy Mackarel" or something.

Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)

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Frank Bemelman 20 years ago

"Jim Thompson" schreef in bericht news: snipped-for-privacy@4ax.com...

When she gave birth to you, and many occasions after that, no doubt.

Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)

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