PAGE 2 OF 4

SS-254 R5

KOA SPEER ELECTRONICS, INC.

Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.

4. Applications and Ratings

10,000,000

1,000,000

100

-25

0

50

75

100

125

Temperature (

°C)

10

-50

10,000

1,000

25

100,000

100k

Ω

10k

Ω

1k

Ω

3800k

3800k

3200k

5. Environmental Applications

5.1 Temperature Characteristics

6.8k

Ω

10k

Ω

15k

Ω

10k

Ω

20k

Ω

22k

Ω

30k

Ω

33k

Ω

47k

Ω

68k

Ω

100k

Ω

47k

Ω

Part

Designation

Resistance

@ 25°C

Resistance

Tolerance

B Constant

Tolerance

B Constant

@ 25°C/75°C

Operating

Temperature

Range

Thermal

Dissipation

Constant

(mW/°C)

Power

Rating

(mW)

NT731J

25

±5%

±5%

±3%

3500K

3800K

3800K

J: ±5%

K: ±10%

NEW

4100K

3700K

±3%

±10%

-55°C

to

+125°C

1k

Ω

2k

Ω

2.2k

Ω

2.4k

Ω

3.3k

Ω

4.7k

Ω

5k

Ω

6.8k

Ω

10k

Ω

15k

Ω

10k

Ω

20k

Ω

22k

Ω

30k

Ω

33k

Ω

47k

Ω

68k

Ω

100k

Ω

150k

Ω

50k

Ω

10k

Ω

15k

Ω

22k

Ω

30k

Ω

33k

Ω

47k

Ω

68k

Ω

100k

Ω

150k

Ω

1k

Ω

2.2k

Ω

3.3k

Ω

4.7k

Ω

6.8k

Ω

10k

Ω

22k

Ω

33k

Ω

47k

Ω

68k

Ω

100k

Ω

2.8

5

35

±5%

NT732A

NT732B

3200K

3500K

3800K

3500K

3800K

4100K

J: ±5%

K: ±10%

L: ±15%

J: ±5%

K: ±10%

L: ±15%

K: ±10%

L: ±15%

K: ±10%

L: ±15%

-55°C

to

+125°C

3950K

3200K

3500K

3800K

±5%

±10%

±3%

±10%

Temp. (°C)

RT/R25 Ratio vs. B Constant

-55

38770

273.24

638.23

7692.5

1203.1

40

604.07

2.8809

5.5500

54.959

5.1999

-50

28840

197.67

465.81

5414.6

820.76

45

515.10

2.4202

4.6100

45.484

4.2349

-45

21706

144.85

343.25

3864.5

568.09

50

441.00

2.0421

3.8500

37.823

3.4692

-40

16517

107.43

255.22

2794.3

398.57

55

379.00

1.7302

3.2300

31.594

2.8585

-35

12698

80.577

191.37

2045.2

283.20

60

326.90

1.4718

2.7200

26.506

2.3682

-30

9857.0 61.077

144.64

1514.1

203.64

65

282.95

1.2568

2.3100

22.330

1.9721

-25

7721.2 46.759

110.13

1133.0

148.07

70

245.72

1.0771

1.9700

18.886

1.6504

-20

6100.5 36.137

83.710

856.49

108.37

75

214.08 0.92637 1.6800

16.035

1.3877

-15

4858.7 28.173

64.190

653.63

80.182

80

187.08 0.79937 1.4500

13.663

1.1724

-10

3899.0 22.147

49.640

503.31

59.943

85

163.96 0.69199 1.2500

11.682 0.99491

-5

3151.3 17.546

38.680

390.86

45.252

90

144.11 0.60087 1.0800

10.022 0.84926

0

2564.2 14.004

30.370

305.97

34.478

95

127.00 0.52329 0.94000 8.6257 0.72802

5

2099.9 11.256

23.970

241.34

26.473

100

112.21 0.45701 0.82000 7.4466 0.62662

10

1730.0 9.1063

19.070

191.73

20.506

105

99.377 0.40016 0.72000 6.4466 0.54156

15

1433.5 7.4135

15.270

153.36

16.016

110

88.224 0.35129 0.63000 5.5968 0.46982

20

1194.2 6.0712

12.320

123.46

12.608

115

78.501 0.30915 0.56000 4.8721 0.40906

25

1000.0 5.0000

10.000

100.00

10.000

120

70.004 0.27272 0.49000 4.2523 0.35741

30

841.48 4.1398

8.1700

81.470

7.9880

125

62.558 0.24114 0.44000 3.7207 0.31332

35

711.39 3.4451

6.7100

66.739

6.4242

Note: RT/R25 ratio is the resistance at temperature (T) divided by the nominal resistance at 25°C. The RT/R25 ratio value is multiplied

by the thermistor’s nominal 25°C value to determine the nominal resistance value at a given temperature in the chart above.

Ω

k

Ω

k

Ω

B Constant

Resistance

Temp. (°C)

B Constant

Resistance

k

Ω

k

Ω

3200K 3500K 3700K 3800K 4100K

1k

Ω 5k Ω 10k Ω 100k Ω 10kΩ

Ω

k

Ω

k

Ω

k

Ω

k

Ω

3200K 3500K 3700K 3800K 4100K

1k

Ω 5k Ω 10k Ω 100k Ω 10kΩ

5.2 RT/R25 Ratio vs. B Constant