NTC
Thermistor Theory
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Circuit
notes for thermistors:
Overview:Circut Notes for Thermistors:
N.T.C.
Thermistors are used
in a multitude of
diverse customer
applications. The
most common applications
are based on the "zero-power
resistance characteristics" Thermistors
have temperature
coefficients (percentage
change in resistance
per °C), or alpha
values of the order
of -3%/°C to
-6%/°C. This
is a major advantage
of thermistors over
other electronic
temperature sensing
components. Thermistors
have the greatest
temperature sensitivity
of any electronic
sensing component
over their temperature
range of application. For
soldered thermistor
elements with wire
leads (both BetaCURVE
and BetaCHIP) the
range is -80°C
to +150°C. For
Glass Coated thermistors
with bare leads such
as BetaCHIP, DO-35,
Glass Probes and
Glass Beaded Thermistors
the range extends
from -80°C to
+300°C.
The
successful implementation
of thermistor sensing
applications requires
a certain level of
circuit knowledge
to utilize the electrical
characteristics of
thermistors. The
following section
introduces some of
the circuit concepts
and outline typical
and practical applications
of thermistors.
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