701003

Series:	4400
Packaging:	Bulk
Part Status:	Active
Resistance in Ohms @ 25°C:	1k
Resistance Tolerance:	±0.2°C
B Value Tolerance:	±1%
B0/50:	3271K
B25/50:	--
B25/75:	--
B25/85:	3312K
B25/100:	--
Operating Temperature:	-80°C ~ 100°C
Length - Lead Wire:	3.00" (76.20mm)
Mounting Type:	Free Hanging
Package / Case:	Bead

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Temperature Sensors - NTC Thermistors

NTC Thermistors are a type of temperature sensor which measures temperature by sensing the fluctuations in electrical resistance caused when temperature changes. They are widely used and familiar in the electronics industry due to their low cost and flexibility. The NTC thermistors can measure a wide range of temperatures from -55°C to over 300°C with an accuracy of around plus or minus 0.5°C.NTC thermistors are made from a semiconductor material, such as silicon. As the temperature increases, the electrical resistance of the thermistor decreases. This is because the hotter the material, the more energy it has, and the more free electrons it can pass along the circuit. Conversely, as the temperature decreases, the electrical resistance of the thermistor increases.Most NTC thermistors can be classified into two categories: those designed to measure temperatures around a certain fixed point (fixed point thermistors) and those designed to measure temperatures over a large range (variable range thermistors). The type of thermistor used will depend on the type and accuracy of measurement required.Fixed Point ThermistorsFixed point thermistors are designed to measure temperature at a single, fixed point. They are usually quite small and consist of a metal core with a ceramic body, which is wrapped in a metal layer. The metal core is connected to a wire which is connected to a thermistor lead, and the ceramic body is connected to the thermistor lead.As the temperature rises, the resistance of the thermistor decreases and the voltage drop across the thermistor increases, which is measured. This voltage can then be converted to a temperature reading using a Wheatstone bridge circuit.Variable Range ThermistorsVariable-range thermistors are used to measure temperatures over a wide range, from -55°C to over 300°C. These thermistors are more complex than fixed-point thermistors as they contain a combination of two resistors and capacitors.The first resistor is temperature dependent and has a very low resistance when cold and a very high resistance when hot. The second resistor is fixed and has a low resistance.The combination of the two creates a ratio in the thermistor\'s resistance to temperature. This ratio then allows the thermistor to measure a wide range of temperatures with more accuracy than fixed point thermistors.ApplicationsNTC thermistors are used in a wide range of applications including automotive, medical, industrial and telecommunications. They are often used to measure and regulate temperatures in appliances, motors and automotive systems. They are also used to measure temperature in environments which have extreme temperatures, such as in space and military applications.NTC thermistors are also used in medical applications to measure body temperature, including forehead and ear thermometers. They are also used to measure temperatures in heating, ventilation and air conditioning (HVAC) systems in both homes and commercial buildings.ConclusionNTC thermistors are a versatile and cost-effective temperature sensing solution. They can measure temperatures in a wide range of applications from -55°C to over 300°C with a high level of accuracy. NTC thermistors are available in two varieties, fixed point and variable range, allowing engineers to choose the appropriate type for their application.

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