160 KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/30/10
thermal
protection
NT73
negative tempco thermistor
features
•Twelve standard resistance values
•Marking: 1J no marking on pink body, 2A
and 2B black three digit on pink body color
•Products with lead-free terminations meet EU RoHS
requirements. EU RoHS regulation is not intended for
Pb-glass contained in electrode, resistor element and glass.
For further information on packaging,
please refer to Appendix A.
ordering information
J: ±5%
K: ±10%
L: ±15%
3200
3500
3700
3800
3950
4100
T: Sn
(Other termination
styles may be
available, please
contact factory
for options)
2 significant
figures + 1
multiplier
1J: 0603
2A: 0805
2B: 1206
TD: 7"
paper tape
(5,000
pieces/reel)
NT73
Type B Constant
Nominal
Size
Code Nominal
Resistance Resistance
Tolerance
Termination
Material Packaging
New Part # 2A TD 103 KT 3800
Protective
Coating Inner
Electrode
Resistive
Film
Ceramic
Substrate
Solder
Plating
Ni
Plating
Lcc
W
t
d
dimensions and construction
L
.012 +.008
-.004
(0.3 +0.2)
-0.1
.02 +.008
-.004
(0.5 +0.2)
-0.1
.063±.008
(1.6±0.2) .031±.004
(0.8±0.1) .012±.004
(0.3±0.1) .012±.004
(0.3±0.1) .02±.004
(0.5±0.1)
.016±.008
(0.4±0.2)
.049±.004
(1.25±0.1)
.079±.008
(2.0±0.2)
2A
(0805)
.016 +.008
-.004
(0.4 +0.2)
-0.1
.024±.004
(0.6±0.1)
.02±.008
(0.5±0.3)
.063±.008
(1.6±0.2)
.126±.008
(3.2±0.2)
2B
(1206)
Wc d t
Dimensions inches (mm)
Type
1J
(0603)
(Inch Size Code)
H: ±3%
J: ±5%
K: ±10%
B Constant
Tolerance
J
6.8kΩ
10kΩ
15kΩ
10kΩ
20kΩ
22kΩ
30kΩ
33kΩ
47kΩ
68kΩ
100kΩ
47kΩ
1kΩ
2kΩ
2.2kΩ
2.4kΩ
3.3kΩ
4.7kΩ
5kΩ
Part
Designation Resistance
@ 25°C Resistance
Tolerance
applications and ratings
B Constant
Tolerance
B Constant
@ 25°C/75°C
Operating
Temperature
Range
Power
Rating
(mW)
NT731J 5
5
±5%
±5%
±3%
3500K
3800K
3800K
J: ±5%
K: ±10%
4100K
3700K ±3%
±10%
-55°C
to
+125°C
EU
3200K
3500K
K: ±10%
L: ±15%
J: ±5%; K: ±10%
L: ±15%
±10%
±5%
NT732A
6.8kΩ
10kΩ
15kΩ
10kΩ
20kΩ
22kΩ
30kΩ
33kΩ
47kΩ
68kΩ
100kΩ
150kΩ
50kΩ
10kΩ
15kΩ
20kΩ
22kΩ
30kΩ
33kΩ
47kΩ
68kΩ
100kΩ
150kΩ
1kΩ
2.2kΩ
3.3kΩ
4.7kΩ
6.8kΩ
10kΩ
22kΩ
33kΩ
47kΩ
68kΩ
100kΩ
NT73
negative tempco thermistor
Part
Designation Resistance
@ 25°C Resistance
Tolerance
applications and ratings (continued)
B Constant
Tolerance
B Constant
@ 25°C/75°C
Operating
Temperature
Range
Power
Rating
(mW)
5
5
±5%
NT732A
NT732B
3500K
3800K
3800K
4100K
J: ±5%
K: ±10%
L: ±15%
J: ±5%
K: ±10%
L: ±15%
K: ±10%
L: ±15%
-55°C
to
+125°C
3950K
3200K
3500K
3800K ±5%
±10%
±3%
±10%
K:±10%; L: ±15%
Performance Characteristics
Temperature Characteristics
environmental applications
10,000,000
1,000,000
100
-25 0 5075100125
Temperature (°C)
10
-50
10,000
1,000
Resistance (Ω)
25
100,000 100kΩ
10kΩ
1kΩ
3800k
3800k
3200k
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
Ωk Ωk Ω
B Constant
Resistance
Temp. (°C)
B Constant
Resistance
k Ωk Ω
3200K 3500K 3700K 3800K 4100K
1k Ω5k Ω10k Ω100k Ω10kΩ
Ωk Ωk Ωk Ωk Ω
3200K 3500K 3700K 3800K 4100K
1k Ω5k Ω10k Ω100k Ω10kΩ
Resistance
Within specified
tolerance
B Constant +25°C/+75°C
25°C
Within specified
tolerance
Resistance to Solder Heat 260°C ± 5°C, 10 seconds ± 1 second
±1%, ±2%:1kΩ
Rapid Change of Temperature -55°C (30 minutes),+125°C (30 minutes), 50 cycles
Moisture Resistance 40°C ± 2°C, 90 - 95% RH, 1000 hours
±3.0%
High Temperature Exposure 80°C, 1000 hours
Load Life 80°C ± 3°C, DC5mW, 1000 hours
±3.0%
±3.0%
±3.0%
––
––
±0.5%, ±1%:1kΩ
±1.1%
±2.5%
±1.3%
±1.6%
Parameter
Requirement ∆R ±(%+0.05Ω)
Limit Typical Test Method
Thermal dissipation constant - in the atmosphere - (reference) 1J: 2.0mW/°C, 2A: 2.8mW/°C, 2B: 3.0mW/°C
Confirming resistance drift is recommended since this product has a tendency to have bigger resistance change than general flat chip over 80°C.
Please pay attention not to be applied ESD, it may cause of resistance change.
Test Items
High Temperature Exposure 125°C, 1000 hours
±7.0%
Reference Test Method
ESD Human model, 100 pF 1.5 kΩ
500V
Actual Value (Out of Guarantee)
thermal
protection
161
KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 12/30/10
