Peak Atlas DCA Pro
User Guide
June 2019
–
Rev 1.7
Page 21
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 transistors are usually found in surface mount packages and are
becoming more common, particularly in mass produced electronic products.
These devices are generally intended to
be used with logic level signals (3V or
5V typically), as such the gain of the
device is rarely of concern.
The
DCA Pro
will identify the pinout,
the raw current gain and the voltage
thresholds for turning the transistor on
or off.
Additionally, using V/I slope analysis,
the
DCA Pro
will estimate the values of
the internal resistors.
The internal resistors are typically in the
range of 1k
Ω
to 100k
Ω
in a variety of
ratios.
