NT73
negative tempco thermistor
features
•
•
•
•
•
Anti-leaching nickel barrier terminations
90/10 solder plated terminations, standard
Twelve standard resistance values
Suitable for reflow and wave soldering
Marking: Black three-digit on pink body color
circuit
protection
dimensions and construction
c
L
c
Type
(Inch Size Code)
L
Dimensions
inches
(mm)
W
c
d
t
.02±.004
(0.5±0.1)
+.008
-.004
(0.5
+0.2
)
-0.1
W
Solder
Plating
t
d
Protective
Coating
Resistive Inner
Film
Electrode
Ni
Plating
1J
(0603)
2A
(0805)
2B
(1206)
.063±.008 .031±.004 .012±.004 .012±.004
(1.6±0.2)
(0.8±0.1)
(0.3±0.1)
(0.3±0.1)
.079±.008 .049±.004 .016±.008
(2.0±0.2) (1.25±0.1) (0.4±0.2)
.126±.008 .063±.008
(3.2±0.2)
(1.6±0.2)
.02±.008
(0.5±0.3)
.012
(0.3
.016
(0.4
+.008
-.004
+0.2
)
-0.1
+.008
-.004
+0.2
-0.1
)
.02
.024±.004
(0.6±0.1)
Ceramic
Substrate
ordering information
Old Part #
New Part #
NT73
NT73
Type
2A
2A
Size
Code
1J: 0603
2A: 0805
2B: 1206
L
Termination
Material
L: SnPb
T: Sn
T
TD
Packaging
TD: 7" paper tape
(5,000 pieces/reel)
103
103
Nominal
Resistance
2 significant
figures + 1
multiplier
K
K
Resistance
Tolerance
J: ±5%
K: ±10%
L: ±15%
3800
B Constant
Nominal
3200
3500
3800
J
B Constant
Tolerance
J: ±5%
K: ±10%
For further information on packaging,
please refer to Appendix A.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
11/01/03
144
KOA Speer Electronics, Inc.
• Bolivar Drive • P Box 547 • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
.O.
NT73
negative tempco thermistor
applications and ratings
Part
Designation
Resistance
@ 25°C
6.8kΩ
10kΩ
15kΩ
20kΩ
22kΩ
30kΩ
33kΩ
47kΩ
68kΩ
100kΩ
1.0kΩ
2.0kΩ
2.2kΩ
2.4kΩ
3.3kΩ
4.7kΩ
5.0kΩ
6.8kΩ
10kΩ
10kΩ
15kΩ
20kΩ
22kΩ
30kΩ
33kΩ
47kΩ
68kΩ
100kΩ
150kΩ
1.0kΩ
2.2kΩ
3.3kΩ
4.7kΩ
6.8kΩ
10kΩ
22kΩ
33kΩ
47kΩ
68kΩ
100kΩ
Resistance
Tolerance
B Constant
@ 25°C/75°C
3500K
3800K
B Constant
Tolerance
±10%
Thermal
Dissipation
Constant
(mW/°C)
Power
Rating
(mW)
Operating
Temperature
Range
circuit
protection
NEW
J: ±5%
K: ±10%
3800K
±5%
2
5
NT731J
3200K
K: ±10%
L: ±15%
3500K
±10%
3800K
3500K
NT732A
2.8
J: ±5%
K: ±10%
L: ±15%
3800K
5
-55°C
to
+125°C
±5%
3200K
K: ±10%
L: ±15%
J: ±5%
K: ±10%
L: ±15%
3500K
±10%
3
5
NT732B
3800K
±5%
environmental applications
Temperature Characteristics
10,000,000
1,000,000
Resistance (Ω)
100,000
10,000
100kΩ
RT/R25 Ratio vs. B Constant
Temperature (°C)
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
B Constant (K) Temperature (°C) B Constant (K)
3200 3500 3800
3200 3500 3800
51.45
37.02
27.03
20.00
14.99
11.36
8.71
6.75
5.28
4.17
3.33
2.67
2.17
1.77
1.45
1.20
1.00
0.838
0.706
74.45
51.94
36.82
26.48
19.32
14.27
10.68
8.08
6.18
4.77
3.72
2.93
2.33
1.86
1.50
1.22
1.00
0.824
0.683
107.72
72.87
50.15
35.07
24.90
17.92
13.08
9.66
7.22
5.46
4.17
3.21
2.50
1.97
1.56
1.24
1.00
0.810
0.661
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
0.598
0.509
0.436
0.375
0.323
0.281
0.244
0.214
0.188
0.165
0.146
0.130
0.115
0.103
0.092
0.083
0.075
0.067
0.570
0.478
0.403
0.342
0.291
0.249
0.214
0.185
0.160
0.140
0.122
0.107
0.094
0.083
0.074
0.066
0.058
0.052
0.543
0.448
0.373
0.312
0.262
0.221
0.188
0.160
0.137
0.118
0.102
0.088
0.077
0.067
0.059
0.052
0.046
0.041
1,000
10kΩ
100
10
-50
-25
0
25
50
75
Temperature (°C)
100
1kΩ
125
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.
Performance Characteristics
Parameter
High Temperature Exposure
Resistance to Solder Heat
Terminal Strength-Bend
Moisture Resistance
Life
Temperature Cycling
Dielectric Withstanding Voltage
2A
2B
Insulation Resistance
Maximum
∆
R
±3.0%
±1.0%
±1.0%
±3.0%
±3.0%
±3.0%
400V
400V
10,000 MΩ Minimum
Test Method
1000 hours @ 80°C
MIL-R-55342
π
4.7.7, 260°C for 10 seconds
2mm min. deflection in either direction for 10 seconds
MIL-STD-202, Method 103, 40°C, 90 - 95% RH, 1000 hours
80°C, DC 5mm, 1000 hours
30 minutes @ -55°C, 15 minutes @ +25°C, 30 minutes @ +125°C,
15 minutes @ +25°C, 50 cycles
1 minute minimum
MIL-STD-202, Method 301
—
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
11/24/03
KOA Speer Electronics, Inc.
• Bolivar Drive • P Box 547 • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
.O.
145
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