MMBTH81 is almost the last pretty fast, small PNP still standing.
I need to clamp the swing of a fast positive logic level, so
collector to ground base to +3 emitter to logic level
Low-capacitance Schottky diode.
BF970 are still around....but yeah, since the 90s it looks like options have been dwindling. I'm not exactly sure why.
I've been using USB ESD protectors for those sorts of things. They're claimed to be amazingly fast with fractional pF loading. But yes, I'd love some GHz PNP's, too.
Cheers, James Arthur
Unknown @ DK, obsolete @ Mouser, 0 stock.
AFAIK the only fastish PNPs left are these Siliconix/Renesas transistor arrays.
I still have a reel of BFG31, but cannot design them in for customers.
regards, Gerhard.
Winfield Hill wrote in news: snipped-for-privacy@drn.newsguy.com:
PIN diode?
50A02CH is only slightly slower?
piglet
That one is a nice combination of speed, voltage, current, and capacitance. I want minimum capacitance, so can probably still use MMBTH81, but that is marginal on current. Worst case, I may want to sink 100 mA for a short time.
I guess I could use a schottky diode into a sinking supply, but the PNP clamp conveniently dumps the current into ground.
Me too, plus two reels of BFT92s. Internal use only.
Cheers
Phil Hobbs
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