Datasheet > NTC470D13MB2E3C035BNN

NTC470D13MB2E3C035BNN

更新时间： 2024-11-07 16:54:51

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风华高科 - FH		/
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14页	1511K
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NTC

NTC THERMISTOR

OUTLINE

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

1200

1500

Sintered at high temperature(1200 to 1500

)

Critical Technical Parameters of NTC Thermistor

Rt---Zero Power Resistance

NTC

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---Rated Zero Power Resistance

R₂₅

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

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 zero-

power to the balance between the reciprocals of the two

temperatures.The formula is as below:

1 1

T₁T₂

R_T1

R_T2

T₁T₂

T₂T₁

R_T1

R_T2

(

)

B=ln

R_T2T₁T₂

R_T1

T₁T₂

T₂T₁

R_T1

R_T2

(

)

B=ln

In this formula: R_T1is the resistance at Zero-power when the

temperature is T₁

R_T1

R_T2

R_T2is the resisrtance at Zero-power when the temperature is

T₂Unless otherwise specified, B value is got by calculating

25 ( 298.

the Zero-power resistances at 25

( 298.15K ) and 85

15K )

85 ( 358.15K )

, B

( 358.15K ) . It's not a firm constant within the range of

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:

DR_T

R_TDT

T₂

DR_T

R_TDT

T₂

In this formula, " " stands for the resistance-temperature

coefficient at Zero-power when the temperature is T:

R_Tstands for the resistance value at Zero-power when the

temperature is T

R_T-

(

)

T stands for thetemperature(in K)

B stands for B value

138

12 3 4 5 6 7...14

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