"DaveC" wrote in message
...
Dead. Other with identical markings measure as NPN. What else to determine
from measurements?

Find a modest to high voltage supply, add a large series resistor
(10k-100k?), and measure the reverse breakdown.

Wire it as a common emitter amplifier, not really to amplify but just to
check bias. Play with base resistors until you get the edge of saturation
for some collector current. Then double the collector current and do it
again. That'll more or less let you plot hFE(Ic). Where it drops by half
or so is near Ic(max).

Now you know Vebo, Vcbo, hFE and Ic(max). Vebo is generally less than 5V
for RF parts, so you'll likely have a high fT in that case. You can set it
up with a square wave input to measure t_r, t_f, t_stg etc. if you like.

Tim

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Seven Transistor Labs
Electrical Engineering Consultation
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