1littelfuse.com
© 2018 Littelfuse, Inc. Revised: February 26, 2018
Specifications are subject to change without notice.
Interchangeable Thermistor
Leaded Thermistors
Description
Littelfuse precision interchangeable thermistors are low cost,
highly accurate, stable devices designed specifically for
temperature sensing and control applications. They are particularly
suited for uses where their precision interchangeability eliminates
the necessity for costly individual circuit calibration.
Dimensions
A B C D
0.250”
Nom
30 AWG
0.010”
0.095”
Max
1.5”
±0.250”
Dimensions shown in inches.
Features
• High accuracy
• Fast thermal response
• Low cost
• Small size
• Epoxy encapsulated
• High stability
• Long life
• R/T Curve-matched
Options
• Non-standard
resistance values
and tolerances
• Special lead materials
and lengths
• Special encapsulants or
probe housings
0.250"
NOM
1.5" .250"
EPOXY
COATING
30 AWG (0.010") KYNAR
INSULATED WIRE
0.095"
MAX
“KS” & “KT” SERIES
0.250"
NOM
1.5"
±0.250"
EPOXY
COATING
KYNAR
INSULATED WIRE
0.095"
MAX
A
C
B
D
A B C D
30 AWG
(0.010")
Part Numbering System
Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details.
KT 10 2 J 2
No Significance
Multiplier, power of 10
Ex. 102 = 10 Ω x 102 = 1,000 Ω
Resistance @ 25ºC
Base Value
R-T Curve
Series
KT Series Standard Precision Interchangeable Thermistors
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each
product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at:
www.littelfuse.com/disclaimer-electronics
2littelfuse.com
© 2018 Littelfuse, Inc. Revised: February 26, 2018
Specifications are subject to change without notice.
Interchangeable Thermistor
Leaded Thermistors
Specifications
Part
Number
Resistance
Ohms
@25°C
Accuracy
(±°C)
0-70°C
R-T
Curve
Temperature
Coefficient
(% / °C)
@ 25°C
Beta (K)
0-50°C
Max.
Power
Rating
(mW)
Dissipation
Constant,
Nominal
(mW/°C)
Thermal
Time
Constant,
Max. - Still
Air
(seconds)
Thermal
Time
Constant,
Max. - Well
Stirred Oil
(seconds)
Temperature
Range
(°C)
Storage &
Operation
Temp for Best
L/T Stability
(°C)
KT102J2 1000 ±0.2°C J -4.4 3892 30 110 1-80 to +150 -80 to +75
KT222J2 2252 ±0.2°C J-4.4 3892 30 110 1-80 to +150 -80 to +75
KT302J2 3000 ±0.2°C J-4.4 3892 30 110 1-80 to +150 -80 to +75
KT502J2 5000 ±0.2°C J-4.4 3892 30 110 1-80 to +150 -80 to +75
KT602J2 6000 ±0.2°C J-4.4 4140 30 110 1-80 to +150 -80 to +75
KT602J2 6000 ±0.1°C J-4.4 3892 30 110 1-80 to +150 -80 to +75
KT103G2 10000 ±0.2°C G-4.04 3575 30 110 1-80 to +150 -80 to +75
KT103J2 10000 ±0.2°C J -4.4 3892 30 110 1-80 to +150 -80 to +75
KT203J2 20000 ±0.2°C J -4.4 4140 30 110 1-80 to +150 -80 to +75
KT303J2 30000 ±0.2°C J-4.4 3892 30 110 1-80 to +150 -80 to +75
KT503J2 50000 ±0.2°C J-4.4 3892 30 110 1-80 to +150 -80 to +75
KT503R2 50000 ±0.2°C R-4.68 3892 30 110 1-80 to +150 -80 to +75
KT104R2 100000 ±0.2°C R -4.68 3892 30 110 1-80 to +150 -80 to +75
KT Series Standard Precision Interchangeable Thermistors
