Datasheet > NTCCM20124AH683HC

NTCCM20124AH683HC

更新时间： 2023-06-15 00:00:00

品牌	Logo	应用领域
东电化 - TDK		/
页数	文件大小	规格书
9页	373K
描述
RESISTOR, TEMPERATURE DEPENDENT, NTC, 68000ohm, SURFACE MOUNT

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B221_NTCCM

(1/9)

NTCCM Series NTCCM1005, 1608, 2012 Types

Sensors

Temperature Sensors

NTC Thermistors

PHYSICAL PROPERTIES OF NTC THERMISTORS

INITIAL RESISTANCE

HEAT DISSIPATION COEFFICIENT

Thermistor resistance is a function of absolute temperature as

indicated by the following relationship:

Temperature rises due to thermal energy formed as electrical cur-

rent ﬂows through the thermistor. The thermistor temperature T⁰is

then related to the surrounding temperature Ta and the electrical

input W:

............................................................ (1)

–

R=R0 • expB

(

)

T⁰

Here R⁰, R(kΩ) are the respective resistance values when the sur-

rounding temperature is T⁰, T(K). B is the thermistor constant(B

constant below).

W=k(T⁰–Ta)=V•I(mW) ............................................................(4)

...............................................................(5)

W(%/°C)

T⁰–Ta

This k value is the heat dissipation coefﬁcient, which represents

the additional electrical power (mW/°C) needed to raise the ther-

mistor temperature by 1°C. This heat dissipation coefﬁcient varies

with changes in the measurement and environmental conditions.

When a thermistor is used for temperature measurement, it is nat-

urally important to lower the applied electrical current as much as

possible in order to reduce measurement error resulting from self

heating.

B constant

The B constant is found from the following equation:

2.3026(logR–logR0)

....................................................... (2)

T⁰

–

This B characteristic is indicated by the slope of the linear plot of

log R vrs inverse absolute temperature.

The B constant value is generally in the vicinity of 2500K to 5000K.

B constant values of 3000K to 4000K are frequently used for mea-

surements.

VOLTAGE - CURRENT CHARACTERISTIC

The voltage - current characteristic indicates the drop in voltage as

electrical current through the thermistor is gradually increased.

Resistance-temperature characteristics (Fig.1)

450 400 350 300 250

200

150

100

Voltage-current characteristics (Fig.2)

100

20kΩ/200°C

3.3kΩ/100°C

(

)

Ta=25°C in still air

No.1 5kΩ

10kΩ

20kΩ

50kΩ

100kΩ

1.4

1.6

1.8

2.2

2.4

2.6

2.8

×10³°C

(

)

0.1

100

(

)

Current mA

TEMPERATURE COEFFICIENT

The relationship between temperature coefﬁcient α and B becomes:

T²

............................................. (3)

α=

•

=–

×100(%/°C)

The negative sign of the temperature coefﬁcient indicates that the

temperature coefﬁcient decreases as both thermistor resistance

and temperature rise. If B is taken as 3400K, the temperature coef-

ﬁcient found at 20°C (293.15K) becomes –4%/°C.

Speciﬁcations which provide more details for the proper and safe use of the described product are available upon request.

All speciﬁcations are subject to change without notice.

12 3 4 5 6 7...9

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