NTC THERMISTOR
Description
NTC NTC THERMISTOR NTC NTC THERMISTOR
OUTLINE
2 1200 4 This is a Negative Temperature Coefficient Resistor Whose resistance changes with ambient temperature changes.
Thermistor comprises 2or 4 kinds of metal oxides of iron, nickel,cobalt, manganese and copper, being shaped and Sintered at high temperature(1200 to 1500 )
1500
NTC
Rt
Critical Technical Parameters of NTC Thermistor
Rt---Resistance Value at Zero-power It's a resistance which is got at a fixed temperature on a basis of a testing power which causes resistance to Vary in a range which can be ignored in relation to the total testing eror.
R25 R25---Resistance Value at Rated Zero-power The design resistance of the thermistor usually refers to the resistance value got at Zero-power at 25 , which is usually indicated on the thermistor.
B Value B value stands for the thermal exponent at a negative temperature coefficient.
lt's defined as a ratio of the balance between the natural logarithms of resistance values at zeropower to the balance between the reciprocals of the two temperatures.
The formula is as below: RT1 ( 1 / T1 Rt2 1 ) T T R = 1 2 ln T1 T2 RT2 T2 T1 R T1 ( 1 / T1 R t2 1 ) T1 T2 R = ln T1 T2 R T2 T2 T1
25
B B
B=ln
B=ln
RT1 RT2
T1 T2 B 25 ( 298.
( 323.
15K ) ,B
In this formula: RT1 is the resistance at Zero-power when the temperature is T1 RT2 is the resisrtance at Zero-power when the temperature is T2 Unless otherwise specified, B value is got by calculating the Zero-power resistances at 25 working temperature.
Resistance-to-Temperature Coefficient at Zero-power It refers to the ratio of changes of a thermistor.
Resistance value at Zero-powerwhen The temperature, to the resistance value at Zero-power The formula is as below: B T2 ( 298.
15K ) and50 ( 323.
15K ) .
It's not a firm constant within the range of
15K )
50
T
T
=
1 DRT = RT DT
T
=
1 DR T = R T DT
B T2
T
T T ( B K )
RTT B
In this formula, " " stands for the resistance-temperature coefficient at Zero-power when the tempera...
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