188 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. 12/29/08
features
•High stability and excellent linearity
•Miniature size
•Marking: Light-gray body color with color-coded bands
•Products with lead-free terminations
meet EU RoHS requirements
LT
linear positive miniature tempco thermistor
dimensions and construction
Ceramic Core
d
D
Marking Resistive
Film
Insulation Coating
Trimming Line
End
Cap Lead
Wire
L l
C
L (ref.)
LT1/6 .126±.012
(3.2±0.3) .146
(3.7) .067±.008
(1.7±0.2) .018±.002
(0.45±0.05) 1.18±.118
(30.0±3.0)
.024±.002
(0.6±0.05)
.091±.012
(2.3±0.3)
.280
(7.1)
.248±.008
(6.3±0.5)
LT1/4
Type C (max.) Dd l
Dimensions inches (mm)
For further information on packaging, please refer to Appendix C.
ordering information
LT
Type
New Part #
1/4
1/6
1/6
Power
Rating
C: SnCu
C
Termination
Material
T26, T52
T26
Taping and
Forming
A: Ammo
R: Reel
A
Packaging
2 significant
figures + 1
multiplier
“R” indicates
decimal on
value <10Ω
102
Nominal
Resistance
J: ±5%
J
Tolerance
1000 -
4,500
3600
T.C.R.
(ppm/˚C)
Resistance
Range
E-24
(LT1/4S)
T.C.R.
(ppm/°C)*
Rated
Ambient
Temperature
Operating
Temperature
Range
T.C.R.
Tolerance
Resistance
Range
E-24
(LT1/6S)
applications and ratings
Resistance
Tolerance
-40°C
to
+125°C
+70°C
1000
1200
1400 100Ω - 20KΩ100Ω - 39KΩ
J: ±5%
±15%
±10%
* T.C.R. measuring temperature: +25°C to +75°C
EU
2000 100Ω - 9.1KΩ100Ω - 15KΩ
3600
3900
4200
4500
100Ω - 5.1KΩ100Ω - 6.8KΩ
100Ω - 3.3KΩ100Ω - 6.2KΩ
100Ω - 750Ω100Ω - 1KΩ
100Ω - 240Ω100Ω - 510Ω
thermal
protection
LT
linear positive miniature tempco thermistor
Performance Characteristics
Derating Curve
environmental applications
% Rated Power
100
80
60
40
20
-20 0 20406080100120140
12570
Ambient Te mperature
(°C)
0
-40
Temperature Characteristics of Resistance
50
40
10
0
-50 -25 0 5075100125
Ambient Te mperature
(°C)
-30
-75
4500
30
20
-10
-20
3600
2000
1000
Resistance Changing Rate (%)
25
TCR (X10-6/K)
Approximate Expression for Resistance-Temperature Characteristics
C1C2
3600 4.0000 x 10-6
0.9175
C0
T.C.R.
(x10-6/K)
0.0032
(Values are not guaranteed but typical)
RT=R25 (C0+C1T+C2T2)
RT: Resistance value at T°C
R25: Resistance value at 25°C
T: Ambient temperature (°C)
C0, C1, C2: Constants
4200
4500
0.9026 0.0038 3.9964 x 10-6
4.0064 x 10-6
0.8948 0.0041
3900 4.0064 x 10-6
0.9099 0.0035
189
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. 12/29/08
Parameter
Requirement ∆ R ±(% + 0.05Ω)
Limit Typical Test Method
Resistance 25°C
Within specified
tolerance —
Overload (Short time) Rated voltage x 2.5 for 5 seconds
±1% ±0.75%
Resistance to Solder Heat 260°C ±5°C, 10 seconds ± 1 second
±1% ±0.75%
Rapid Change of Temperature -40°C (30 minutes), +125°C (30 minutes), 5 cycles
±1% ±0.75%
Moisture Resistance 40°C ± 2°C, 90 - 95% RH, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±3% ±2%
Endurance at 70°C 70°C ± 2°C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
±3% ±2%
thermal
protection
