NTCG104LH223JT - TDK - Datasheet.Directory

• All specifications are subject to change without notice.

• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific

bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

NTC Thermistors

Summary

Issue date: April 2011

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• All specifications are subject to change without notice.

NTC Thermistors

Summary

NTC(Negative Temperature Coefficient) Thermistors are

manufactured from sintered metal oxides. Each thermistor consists

of a combination of two to four of the following materials:

Manganese, Nickel, Cobalt and Copper.

These semiconductor resistors exhibit decreasing resistance

characteristics with increasing temperature, and have a low

thermal time constant resulting in an extremely high rate of

resistance change to accurately track the temperature.

FEATURES

TDK NTC thermistors are high-quality thermistors that have been

manufactured from carefully selected high-quality materials. TDK

uses unique fine ceramics manufacturing and precision machining

to manufacture its high quality thermistors.

• Small, compact, and highly responsive to temperature changes.

• Tightly controlled B constant for predictable and accurate

temperature measurement.

• Highly reliable.

• The chip type, the glass diode type, and the resin coated type

are prepared according to the applications. Moreover, it is

possible to correspond widely as an assembly product which

makes the best use of these features.

APPLICATIONS

TDK NTC thermistors are widely used as the followings.

PHYSICAL PROPERTIES OF NTC THERMISTORS

INITIAL RESISTANCE

Thermistor resistance is a function of absolute temperature as indi-

cated by the following relationship:

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

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).

B CONSTANT

The B constant is found from the following equation:

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

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

log R-1/T 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)

TEMPERATURE COEFFICIENT

The relationship between temperature coefficient

and B becomes:

..............................................(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.

HEAT DISSIPATION COEFFICIENT

Temperature rises due to thermal energy formed as electrical cur-

rent flows through the thermistor. The thermistor temperature T0 is

then related to the surrounding temperature Ta and the electrical

input W:

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

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

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.

Conformity to RoHS Directive

Field Applications

Automobile

Intake-air temperature sensors, exhaust-air

temperature sensors, cooling-water temperature

sensors, lubricating-oil temperature sensors

Air conditioning Oil fan heaters, solar heating systems, air

conditioners

Office automation

equipment Copier-facsimiles, computer equipment

Medical

instruments

Clinical thermometers, intravenous injection

temperature regulators, neonatal incubators

Cooking

appliances

Microwave ovens, steam ovens, electric crock pots,

electric ranges, electric ovens

Home medical

electronics

Electronic clinical thermometers, warm washing

toilets, electric curling irons

Household

appliances

Refrigerators, irons, electric water-heaters, electric

tea-pots, electric coffee-makers, washing machines,

TVs, video cassette recorders, stereo sets, radios

Information and

Telecommunications

Cellular phones, chargeable battery pack, personal

computers

R=R0 •

expB 1

–

( )

B= 1

–

2.3026(logR–logR0)

100

Resistance(kΩ)

1.4

450 400 350 300 250 200 150 100

1.6 1.8 2 2.2 2.4 2.6 2.8 3

×10

(K)

3.3kΩ/100˚C

20kΩ/200˚C

Temperature(˚C)

α= • = –

×100(%/°C)

(mW/°C)

T0–Ta

• Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific

bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

(2/4)

004-04 / 20110428 / eb221_ntc_sum.fm

• All specifications are subject to change without notice.

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)

HEATING TIME CONSTANT

The time period required to heat up a thermistor from a certain

temperature T0 over a target temperature rise is called the heating

time constant. Various types of heating time constants are indi-

cated by the symbols shown in Table 1 as determined by the per-

cent change from T0 toward the target temperature. The standard

change is typically taken to be 63.2%.

Thermal time constants (Fig.3)

Table 1 Heating time constant and temperature change ratio

Code Rate of change (%) for T0 -Ta

τ63.2

2τ86.5

3τ95.0

4τ98.2

5τ99.4

6τ99.8

7τ99.9

100

Voltage(V)

0.1 1 10 100

Current(mA)

Ta=25˚C(in still air)

No.1

5kΩ

10kΩ

20kΩ

50kΩ

100kΩ

Temperature(˚C)

τ2τ3τ4τ5τ6τ7τ

Heating

Cooling

Room temperature Ta

–Ta)

×0.632

–Ta)

×0.368

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• All specifications are subject to change without notice.

PRODUCT IDENTIFICATION

• Chip type: Please refer to the NTCG Series catalog (eb221_ntcg).

• Assembled products: Please refer to the NTCGP/NTCDP Series catalog (eb225_ntcdp).

(1) This code denotes NTC thermistors.

(2) Structural classification code

(3) Assembly classification code

(4) B constant(Resistance temperature characteristics)

This code indicates the value of B constant using a combination

of one numeric and one alphabetic character.

(5) B constant tolerance

This code indicates tolerances using the following code.

(6) Nominal resistance

This code indicates the resistance value existing at the speci-

fied ambient temperature by two significant digits followed by

the digit 0(zero).

(Example)

(7) Nominal resistance tolerance

Tolerance is identified by the following codes.

(8) Ambient temperature for nominal resistance

Ambient temperatures for specified nominal-resistance values

are indicated using the following codes.

(9) Dimensional code

(10) Plating specification code of lead wire

(11) Packaging style

(12) TDK internal code

NTC D S 3H G 202 J C 3

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)

D Glass sealed diode shape

G Multilayer element

S Without processing

C Short cut lead wire

E Kinked lead wire

D Kinked lead wire with insulation tube

A Folded radial lead wire

B Folded radial lead wire with insulation tube

Z Others

Code Tolerance(%)

F±1

G±2

H±3

J±5

K±10

Numeric code B constant(K) Alphabetic code B constant(K)

1 1000 A 0 to 50

2 2000 B 51 to 100

3 3000 C 101 to 150

4 4000 D 151 to 200

5 5000 E 201 to 250

F251 to 300

G301 to 350

H351 to 400

J401 to 450

K451 to 500

L501 to 550

M551 to 600

N601 to 650

P651 to 700

Q701 to 750

R751 to 800

S801 to 850

T851 to 900

U901 to 950

V951 to 999

Note: Although B constants are

expressed as 1A, 1B, 2A, 2B, etc.

using these two tables, the

alphabetic characters do not denote

tolerances;they have the meaning

shown in the example below.

(Example)

1A=1000(K)

1A=1050(K)

That is, the alphabetic character(in

this example, A) indicates the range

of values that can be specified by the

thermistor user.

470Ω471

5kΩ502

10kΩ103

150kΩ154

Code Tolerance(%)

F±1

G±2

H±3

J±5

Code Ambient temperature(°C)

A–20

C25

D100

E200

F300

G20

XOthers

3 3018(3.0×ø1.8mm)

4 4020(4.0×ø2.0mm)

5 Resin dip shape

NNi

SSn

BBulk

T Taping(Tape width: 52mm)

K Taping(Tape width: 26mm)

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• All specifications are subject to change without notice.

PERFORMANCE AND TEST METHODS

ELECTRICAL CHARACTERISTICS

MECHANICL CHARACTERISTICS

ENVIRONMENTAL TESTS

• The test conditions and the specified values are decided individually.

Item Test method Specifications

Resistance value Measure the value at a power level such that the influences of spontaneous heat generation

can be negligible at the specified ambient temperature.

The measured values must stay

within the specified limits.

B constant

Using the following expression, calculate the value from the resistances at the two specified

ambient temperatures. The measured values must stay

within the specified limits.

Heat dissipation

constant

This constant denotes the power level(mW/°C) that is needed to increase the thermistor

temperature by 1°C. It is calculated by the energy consumption at any two temperatures

and previously measured resistance-temperature characteristic values using the following

expression.

The measured values must stay

within the specified limits.

Thermal time constant Abruptly change the ambient temperature of the thermistor and measure the time until it

reaches 63.2%(1τ) of the temperature difference.

The measured values must stay

within the specified limits.

Withstand voltage Apply the specified voltage to the electrically insulated section of the thermistor under the

specified conditions. No abnormalities must occur.

Rated power Measure the maximum power level at which any increment in thermistor temperature stays

within 0.2°C due to spontaneous heat generation.

The measured values must stay

within the specified limits.

Item Test method Specifications

Tensile strength of

terminal

Secure the thermistor body, and then apply a tensile force to it under the specified conditions

and maintain this state for the specified time. Damage must not occur.

Bending strength of

terminal

Secure the thermistor body and then apply loads to it under the specified conditions. Repeat

this procedure the specified number of times. Damage must not occur.

Vibration resistance Apply vibration under the specified conditions. Repeat this procedure the specified times. Measured values must stay

within the specified limits.

Shock resistance Apply shock under the specified conditions. Repeat this operation the specified number of

times.

Measured values must stay

within the specified limits.

Solderability Solder the thermistor terminals under the specified conditions and check their solderability. Measured values must exceed

the specified limits.

Resistance to soldering

heat

Apply a thermal soldering shock to the thermistor under the specified conditions, then leave

the thermistor in a standard state for the specified time(one hour or more), before

measurement.

Measured values must stay

within the specified limits.

Item Test method Specifications

Low temperature

storage

Allow the thermistor to stand in air at the minimum permissible operating temperature for the

specified time. Place and maintain the thermistor in a normal condition for one hour or more

before measurements.

Measured values must stay

within the specified limits.

High temperature

storage

Allow the thermistor to stand in air at the maximum permissible operating temperature for the

specified time. Place and maintain the thermistor in a normal condition for one hour or more

before measurements.

Measured values must stay

within the specified limits.

Heat cycle

Cycle the thermistor at the minimum permissible operating temperature, the maximum

permissible operating temperature, and room temperature for the specified time. Repeat this

cycle for the specified number of times. Subsequently, place and maintain the thermistor in a

normal condition for one hour or more before measurements.

Measured values must stay

within the specified limits.

Heat shock

Cycle the thermistor at the minimum permissible operating temperature and the maximum

operating temperature for the specified time respectively. Repeat this cycle for the specified

number of times. Subsequently, place and maintain the thermistor in a normal condition for

one hour or more before measurements.

Measured values must stay

within the specified limits.

Moisture resistance

Allow the thermistor to stand in air at the specified temperature and relative humidity for the

specified times. Subsequently, place and maintain the thermistor in a normal condition for

one hour or more before measurements.

Measured values must stay

within the specified limits.

High temperature

Apply the specified electrical load to the thermistor at the maximum permissible operating

temperature for the specified time. After that, place and maintain the thermistor in a normal

condition for one hour or more before measurements.

Measured values must stay

within the specified limits.

B=2.3026 (logR –logR2)

–

k= W

T0–Ta (mW/°C)