Digital Transistors - Peak Atlas DCA75 Pro User Manual

Peak Atlas DCA Pro User Guide June 2019 – Rev 1.7

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 1kΩ to 100kΩ in a variety of
ratios.
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