DCA55 User Guide
November 2021 – Rev 14
Page 18
Digital Transistors
Digital transistors aren’t really digital, they can act
in both a linear or fully on/off mode. They’re called
“digital transistors” because they can be driven
directly by digital outputs without the need for base
current limiting resistors.
These parts are most often found in surface mount packages and
are becoming more common, particularly in mass produced
electronic products.
The presence of the base resistor (and
the base-emitter shunt resistor) means
that it isn’t possible for the
DCA55
to
measure the gain of the device, so only
the device polarity (NPN/PNP) and
pinout is shown.
B
C
E
NPN Digital
Transistor
RED GREEN BLUE
Emit Base Coll
