L
T73
linear positive tempco thermistor
EU
features
•
•
•
•
•
Anti-leaching nickel barrier terminations
Twenty-five specifiable temperature characteristics
SMD thin film resistor with thermo-perceptivity
Marking: Black four-digit on bronze body color
Products with lead-free terminations meet EU RoHS
and China RoHS requirements
thermal
protection
dimensions and construction
c
L
c
Type
(Inch Size Code)
L
Dimensions
inches
(mm)
W
c
d
.012
+.008
-.004
+0.2
)
(0.3
-0.1
.016
(0.4
+.008
-.004
+0.2
)
-0.1
t
.02±.004
(0.5±0.1)
.024±.004
(0.6±0.1)
W
Solder
Plating
Ni
Plating
2A
(0805)
2B
(1206)
.079±.008 .049±.008 .016±.008
(2.0±0.2) (1.25±0.2) (0.4±0.2)
.126±.008 .063±.008
(1.6±0.2)
(3.2±0.2)
.02±.008
(0.5±0.3)
t
d
Protective
Coating
Resistive Inner
Electrode
Film
Ceramic
Substrate
ordering information
New Part #
LT73
Type
2B
Size
Code
2A: 0805
2B: 1206
T
Termination
Material
T: Sn
(Other termination
styles available,
contact factory
for options)
TD
Packaging
TD: 7" paper taping
(5,000 pieces/reel)
TE: 7" embossed plastic
(4,000 pieces/reel)
101
Resistance
Value
2 significant
figures + 1
multiplier
J
Tolerance
G: ±2%
J: ±5%
1000
T.C.R.
applications and ratings
Part
Designation
LT732A
LT322B
Power
Rating
0.1W
0.125W
Maximum
Working
Voltage
50V
75V
Maximum
Overload
Voltage
100V
150V
Thermal
Time
Constant
1.0s
1.5s
Thermal
Dissipation
Constant
1.37mW/°C
+70°C
1.47mW/°C
Rated Ambient
Temperature
Operating
Temperature
Range
-40°C
to
+125°C
Thermal time constant and dissipation constant are reference values, which are values of elements and vary with connecting or fixing methods.
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.
12/19/12
184
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
L
T73
linear positive tempco thermistor
applications and ratings
T.C.R.
(x10
-6
/K)
150, 250, 350, 450, 500
600, 700, 800, 900
1000, 1200, 1400
1600, 1800
2000, 2200, 2400
2600, 2800, 3000
3300, 3600, 3900
4200
4500
T.C.R. Measuring Temperature: +25°C ~ +75°C
Rated voltage =
√
Power Rating x Resistance value or Max. working voltage, whichever is lower.
T.C.R.
Tolerance
±100x10
-6
/K
±150x10
-6
/K
±15%
Resistance Range
E-24
LT732A
2kΩ - 24kΩ
1kΩ - 20kΩ
1kΩ - 13kΩ
510Ω - 4.7kΩ
510Ω - 4.7kΩ
510Ω - 3.0kΩ
510Ω - 3.0kΩ
100Ω - 1kΩ
51Ω - 510Ω
LT732B
2kΩ - 51kΩ
1kΩ - 43kΩ
1kΩ - 27kΩ
1kΩ - 10kΩ
510Ω - 9.1kΩ
510Ω - 6.2kΩ
510Ω - 6.2kΩ
100Ω - 2kΩ
51Ω - 510Ω
G: ±2%
Resistance
Tolerance
J: ±5%
±10%
environmental applications
Derating Curve
100
80
% Rated Power
60
40
20
0
-40
Examples of Temperature
Characteristics of Resistance
Resistance Changing Rate (∆R)
60
50
40
30
20
10
0
-10
-20
-30
-50
-25
0
25
50
75
100
125
3300ppm/°C
2400ppm/°C
1600ppm/°C
4500ppm/°C
For resistors operated at an ambient temperature
of 70°C or above, a power rating shall be derated
in accordance with the above derating curve.
-20
0
80
70
Ambient Temperature
(°C)
20
40
60
100 120
140
125
Ambient Temperature
(°C)
Approximate Expression for Resistance-Temperature Characteristics
T.C.R.
(x10
-6
/K)
3000
3300
3600
3900
4200
4500
C
0
0.9288
0.9232
0.9175
0.9099
0.9026
0.8948
C
1
0.0028
0.0030
0.0032
0.0035
0.0038
0.0041
C
2
1.9983
2.9980
4.0000
4.0064
3.9964
4.0064
x
x
x
x
x
x
10
-6
10
-6
10
-6
10
-6
10
-6
10
-6
Performance Characteristics
Parameter
Resistance
T.C.R.
Overload (Short time)
Resistance to Solder Heat
Rapid Change of Temperature
Moisture Resistance
Endurance at 70°C
Requirement
∆
R ±(% + 0.05Ω)
Limit
Typical
Within specified
—
tolerance
Within specified
—
T.C.R.
±1.0%
±0.23%
±1.0%
±0.1%
±1.0%
±0.1%
±3.0%
±0.54%
±3.0%
±0.62%
Test Method
25°C
+25°C/+75°C
Rated voltage x 2.5 or maximum overload volume for 5 seconds, whichever is lower
260°C ± 5°C, 10 seconds ± 1 second
-40°C (30 minutes)/ +125°C (30 minutes), 5 cycles
40°C ± 2°C, 90 - 95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
Confirming resistance drift is recommended since this product has a tendency to have bigger resistance change than general flat chip over 70°C.
Please pay attention not to be applied ESD, it may cause of resistance change.
Actual Value (Out of Guarantee)
Test Items
Low Temperature Exposure
High Temperature Exposure
ESD
Reference
±0.05%
±0.6%
500V
Test Method
-40°C, 45 minutes
125°C, 1000 hours
Human model, 100 pF 1.5 kΩ
12/19/12
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
KOA Speer Electronics, Inc.
• 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com
185
thermal
protection
嵌入式系统
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