NTC Thermistor
Model No. HNTHNT-GR
Glass sealed radial lead thermistor◆Features ： High reliability、High response、Small size
◆Applications ： Air conditioner、Water heater, Microwave oven、Automotive

123ＧＲ
②１③-

Part number
HNT-GR1
HNT-GR2
Parts nameElement
Glass
Lead wire

１０３④Ｆ
⑤Ｂ
⑥-

Ａ
⑦３９５０⑧Ｆ⑨A[mm]
2.3±0.2
1.3±0.2

B[mm]
L[mm]
3.2±0.570±5
2.8±0.4
70±5SPEC・Materials
NTC thermistor
Glass
Dumet wire＜Type designations＞
designations＞①Series code
NTC Thermistor

d[mm]0.30.2123d-AＨＮＴ①BL＜Maximum Rating＞
Rating＞◆Rated wattage
HNT-GR1
HNT-GR2②Type code
Glass sealed radial lead

157 mW at 25℃
105 mW at 25℃◆Operating temperature range-40℃～+200℃③Size＜Electrical Characteristics＞
Characteristics＞◆Resistance R25④Resistance
3-digitex.103→10×103Ω

2kΩ-200kΩ※Refer to product list

⑤Resistance tolerance
F ： ±1%
G ： ±2%
H ： ±3%J ： ±5%⑥Packing
B ：◆B-constant

3200K – 4500K※Refer to product list

Bulk

◆Dissipation constant⑦Definition of B-constant
A ： B25/50
B ： B25/85
C ： B0/100
D ： B0/25
X ： Individual designation⑧B-constant4-digitB25/50HNT-GR1
0.9～1.1 mW/℃
HNT-GR2
0.6～0.8 mW/℃
※In still air at 25℃◆Thermal time constant
HNT-GR1
HNT-GR2

ex.3950→3950K

12.0s APR
6.0s APR※In still air⑨B-constant tolerance
F ： ±1%
G ： ±2%
H ： ±3%J ： ±5
Made in China

2019/06/24

HOKURIKU※Details are subject to change without notice.

1

NTC Thermistor
Model No. HNTHNT-GA
Glass sealed axial lead thermistor◆Features : High reliability、High accuracy◆Applications ： Home appliances、Industrial equipment
Measuring equipment、AutomotiveＧＡ②１③Part number
HNT-GA1
HNT-GA2
Parts name
1 Element
2 Glass
3 Lead wire

-１０３④Ｆ⑤Ｂ⑥A[mm]
1.9±0.2
1.3±0.2-

Ａ⑦３９５０⑧B[mm]L[mm]
3.6±0.460±32.2±0.3
60±3
SPEC・Materials
NTC thermistor
Glass
Ni-plated CP wire＜Type designations＞
designations＞①Series code
NTC Thermistor

Ｆ⑨d[mm]
0.50.4

123d-

A

ＨＮＴ
①BL

＜Maximum Rating＞
Rating＞◆Rated wattage
HNT-GA1
HNT-GA2②Type code
Glass sealed axial lead

350 mW at 25℃
175 mW at 25℃◆Operating temperature range-40℃～+200℃③Size④Resistance
3-digit＜Electrical Characteristics＞
Characteristics＞◆Resistance R25
ex. 103→10×103Ω

⑤Resistance tolerance
F ： ±1%
G ： ±2%
H ： ±3%J ： ±5%◆B-constantB25/503200K – 4500K※Refer to product list

⑥Packing
B ： Bulk◆Dissipation constant⑦Definition of B-constant
A ： B25/50
B ： B25/85
C ： B0/100
D ： B0/25
X ： Individual designation⑧B-constant4-digit2kΩ-200kΩ※Refer to product list

HNT-GA1
2.0～2.5 mW/℃
HNT-GA2
1.0～1.5 mW/℃
※In still air at 25℃◆Thermal time constant
HNT-GA1
HNT-GA2

ex.3950→3950K

15.0s APR
8.0s APR※In still air⑨B-constant tolerance
F ： ±1%
G ： ±2%
H ： ±3%J ： ±5%
Made in China

2019/06/24

HOKURIKU※Details are subject to change without notice.

2

NTC Thermistor
Model No. HNTHNT-EC
Epoxy resin coated radial lead thermistor◆Features : High accuracy、Moisture proof (Boiling resistance)◆ Applications ： Air conditioner、Refrigerator、Heated toilet seat
Thermometer、Battery packＥＣ②１③-１０３④Ｆ⑤Ｂ⑥-Ａ⑦３９５０⑧Ｆ⑨Part number

A[mm]

B[mm]

L[mm]

d[mm]

P[mm]

HNT-EC13MAX

6MAX

10±10.42±0.3

2SPEC・Materials

1Element

NTC thermistor

2

Coating material

Epoxy resin

3Lead wire

Tin coated annealed copper wire＜Type designations＞
designations＞①Series code
NTC Thermistor

BL＜ Maximum Rating＞
Rating＞◆Rated wattage
200mW at 25℃②Type code
Epoxy resin coated radial lead◆Operating temperature range-40℃～+125℃＜Electrical Characteristics＞
Characteristics＞◆Resistance R25③Size

2kΩ-200kΩ※Refer to product list

④Resistance(R25)3-digitex. 103→10×103Ω
⑤Resistance tolerance
F ： ±1%
G ： ±2%
H ： ±3%J ： ±5%◆B-constant⑥Packing
B ：◆Dissipation constantB25/503200K – 4500K※Refer to product list

2.0mW/℃※In still air at 25℃

Bulk⑦Definition of B-constant
A ： B25/50
B ： B25/85
C ： B0/100
D ： B0/25
X ： Individual designation⑧B-constant4-digit◆Thermal time constant

3.0s MAX※In liquid

ex.3950→3950K⑨B-constant tolerance
F ： ±1%
G ： ±2%
H ： ±3%J ： ±5%

2019/06/24

3A

Parts name

1P-d

ＨＮＴ
①

Made in China

HOKURIKU※Details are subject to change without notice.

3NTC Thermistor
Product list

Part number
HNT-GR
HNT-GA
HNT-ECHNT-GR
HNT-GA
HNT-ECHNT-GR
HNT-GA
HNT-ECHNT-GR
HNT-GA
HNT-ECHNT-GR
HNT-GA
HNT-ECHNT-GR
HNT-GA
HNT-ECHNT-GR
HNT-GA
HNT-EC

B25/50 B25/85[K][K]
2.252k3270

R25[Ω]
3k

5k 10k 15k 20k 30k 50k 100k 200k

(3315)●3400(3435)
●

3470

3950

(3510)(4020)

●
●
●

●
●
●
●

4100

42004400(4150)

●
●
●
●
●
●
●
●
●
●
●
●
●
●
●

(4250)

●
●

●
●

●
●

●
●

●
●

●
●

●
●
●

●
●
●

●
●
●
●
●

●
●
●

●
●
●

●
●
●
●
●
●
●
●

●
●
●
●

(4450)●

B25/85 is a representative value.
Please inquire for characteristics other than the above.

2019/06/24

HOKURIKU※Details are subject to change without notice.

4

NTC Thermistor
Reliability test
◆HNTHNT-GR、GR、HNTHNT-GA
ItemConditions

SPEC

1

High temp. storage test

200℃±5℃、1000hr±24hr

2

Low temp. storage test-40℃±3℃、1000hr±24hr

3Humidity storage test

65℃±3℃、90～95%RH、1000hr±24hr

Temperature cycle test

Ta：-40℃±3℃(air)
To：20℃±5℃(air)Tb：150℃±3℃(air)t1=30min、t2<60s
100cycles

Rate of resistancechange|⊿R|<3%Tb

4

Rate of B-constantchange|⊿B|<3%

To
Ta
t1

t2

t1

t2

1 cycle◆HNTHNT-EC
1Item
High temp. storage test

Conditions
125℃±3℃、1000hr±24hSPEC2

Low temp. storage test

3

Humidity current test

-40℃±3℃、1000hr±24hr
40℃±2℃、90～95%RH、1000hr±24hrDC0.1mA

Rate of resistancechange|⊿R|<1%Tb

4

Ta：-40℃±3℃(air)
To：20℃±5℃(air)Tb：125℃±3℃(air)t1=5min、t2<60s
1000cycles

Temp. cycle test

Rate of B-constantchange|⊿B|<1%ToTa
t1

t2

t1

t2

1 cycleBoiling test

100℃、1000hr±24hr、DV5V

Boiling test is a test of the sensor structure as follows.
5

HNT-EC

Epoxy

Rate of resistancechange|⊿R|<3%Rate of B-constant
Change|⊿B|<3%

Metal Case

2019/06/24

Epoxy

Lead wire

HOKURIKU※Details are subject to change without notice.

5NTC Thermistor
Basic constant and characteristics
characteristics of NTC thermistors
１．Resistance
１．Resistance – temperature characteristic
Resistance – temperature characteristic can be approximated by the equation (1).

Rb = Ra×
Ra×exp{B(1/Tbexp{B(1/Tb-1/Ta)} ・・・・・・・・・・・・・・・・・・・(1)・・・・・・・・・・・・・・・・・・・(1)
Ta、Tb : Absolute temperature [K]Ra、Rb : Zero load resistance at the temperature Ta and Tb
B: B constant※Zero load resistance is resistance value of thermistor at very low power consumption, resistance value
variation of self-heating can be ignored.
２．B
２．B-constantB-constant shows resistance variation value, can be calculated by the 2 point of resistance – temperature
characteristic. B can be approximated by the equation (2)B = (lnRb(lnRb-lnRa)/(1/TblnRa)/(1/Tb-1/Ta)[K] ・・・・・・・・・・・・・・・(2)・・・・・・・・・・・・・・・(2)３．Temperature
３．Temperature coefficient of resistance
The temperature coefficient of resistance can be given by the equation (3), rate of zero load resistanceper 1℃ at arbitrary temperature.

α = 1/R・
1/R・dR/dT×
dR/dT×100 = -B/T2×100 [%] ・・・・・・・・・・・・・・・・・・・・・・・・・・(3)・・・・・・・(3)４．Dissipation
４．Dissipation constantShows the power to rise the thermistor temperature
calculated by the equation (4)Ｐ = δ(Tb(Tb-Ta)

1℃ by self-heating at thermal equilibrium, can beδ = P/(TbP/(Tb-Ta) = I2R/(TbR/(Tb-Ta) [mW/℃[mW/℃] ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・(4)・・(4)P : Power consumption of thermistorδ : Dissipation constant
Ta : Ambient temperature of thermistor
Tb : The temperature of thermistor at thermal equilibrium after temperature rose
I : Current
R : Resistance at temperature Tb
５．The
５．Thermal
Thermal time constant
Thermal time constant is parameter of thermal response of thermistor. When ambient temperature of thermistor
is changed at zero load resistance, it is the time to changed 63.2 % of difference between initial
temperature and final temperature.

(T(T-Ta) = (Tb(Tb-Ta){1Ta){1-exp(exp(-t/τt/τ)} ・・・・・・・・・・・・・・・・・(5)・・・・・・・・・・・・・・・・・(5)τ : Thermal time constant
Hereby t=τ, equation(5)is given by below.
(T(T-Ta)/(TbTa)/(Tb-Ta) =1=1-exp(exp(-1) = 1-0.368 = 0.632
Also, the value of n times of thermal time constant is given by below.
τ= 63.2%、2τ=86.5%、3τ=95.0% ・・・7τ≒100%

2019/06/24

HOKURIKU※Details are subject to change without notice.

6

NTC Thermistor
APPLICATION NOTICNOTICE
1.
2.
3.
4.
5.
6.
7.
8.

Do not use the thermistor beyond operating temperature range.
For high temperature application of thermistors, please be careful about burns or electrical shock.
Thermistors may result in heat-up, fire and explode, so please keep out from explosive gas and flammable materials.
Under the environments affected by electrical noise, take countermeasures by shielding the thermistor andinstalling a protection circuit.
The performance may be impaired if excessive stress or heat is applied to the sensor or lead when handling thethermistor.
When sealing the thermistor, consider the type, amount, curing conditions, adhesion, etc. of the sealing material,and check the reliability.
In case thermistors are applied for wet ambient and/or stress environments, adequate protections like the sealedcase or pressure case should be applied to protect the thermistor.
The thermistor's resistance value becomes lower at higher temperature. If there is no current control circuit,the current will increase and thermal runaway may causes destruction of the thermistor in the worst case. Therefore,
please use within the range of rating.

! NOTICNOTICE
1. This catalogue is subject to change without notice. The data shown in this catalog is typical value, not forguarantee.
Please confirm the conditions by exchanging the specifications before your use.
2. This catalogue shows the data as a component by itself. In the case of use with your circuits and/or sets, it
is out of our guarantee.
3. These components are not expected to use under high reliabilities and safeties in the point of functions accuracies.
In the case of these uses, users shall review the risk at user’s responsibility. Please note that we do nottake any responsibility. Also please take countermeasures like failsafe etc at designs that is required specialsafety.
4. Please refer to the general information indicated in the UL, CSA, safety regulations, for your safety design.
5. For any inquiries, please contact our sales office.

2019/06/24

HOKURIKU※Details are subject to change without notice.

7