NTCCM20124CH154KC datasheet, PDF

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NTCCM20124CH154KC: DescriptionRESISTOR, TEMPERATURE DEPENDENT, NTC, 150000ohm, SURFACE MOUNT; CategoryPassive components The resistor; File Size373KB，9 Pages; ManufacturerTDK Corporation; Websitehttp://www.tdk.com

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NTCCM20124CH154KC Overview

RESISTOR, TEMPERATURE DEPENDENT, NTC, 150000ohm, SURFACE MOUNT

NTCCM20124CH154KC Parametric

Parameter Name	Attribute value
Maker	TDK Corporation
Reach Compliance Code	unknow
ECCN code	EAR99
JESD-609 code	e0
Manufacturer's serial number	NTCCM
Installation features	SURFACE MOUNT
Number of terminals	2
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Package shape	RECTANGULAR PACKAGE
Rated power dissipation(P)	0.23 W
resistance	150000 Ω
Resistor type	NTC THERMISTOR
surface mount	YES
Terminal surface	TIN LEAD
Terminal shape	WRAPAROUND
Thermal sensitivity index	4150 K
Thermistor Applications	TEMPERATURE SENSING

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B221_NTCCM

(1/9)

Sensors

Temperature Sensors

NTC Thermistors

PHYSICAL PROPERTIES OF NTC THERMISTORS

INITIAL RESISTANCE

Thermistor resistance is a function of absolute temperature as

indicated by the following relationship:

R=R

• expB

(

T – T1

)

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

NTCCM Series NTCCM1005, 1608, 2012 Types

HEAT DISSIPATION COEFFICIENT

Temperature rises due to thermal energy formed as electrical cur-

rent ﬂows through the thermistor. The thermistor temperature T

then related to the surrounding temperature Ta and the electrical

input W:

W=k(T

–Ta)=V•I(mW) ............................................................(4)

W(%/°C) ...............................................................(5)

–Ta

Here R

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

rounding temperature is T

, T(K). B is the thermistor constant(B

constant below).

B constant

The B constant is found from the following equation:

2.3026(logR–logR

)

1 – 1

T T

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

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.

Resistance-temperature characteristics (Fig.1)

450 400 350 300

100

250

200

150

100

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.

VOLTAGE - CURRENT CHARACTERISTIC

The voltage - current characteristic indicates the drop in voltage as

electrical current through the thermistor is gradually increased.

Voltage-current characteristics (Fig.2)

100

Resistance (kΩ)

20kΩ/200°C

Voltage (V)

3.3kΩ/100°C

Ta=25°C (in still air)

No.1 5kΩ

2 10kΩ

3 20kΩ

4 50kΩ

5 100kΩ

100

Current (mA)

1.4

1.6

1.8

2.2

2.4

×10

(

°C

)

2.6

2.8

0.1

TEMPERATURE COEFFICIENT

The relationship between temperature coefﬁcient

and B becomes:

α=

1 dR

•

=–

×100(%/°C)

R dT

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

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.

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