Thermistor Probes and Assemblies
Surface Temperature Sensing
USUR1000 Series UL Recognized Ring Lug Thermistor Assembly
Description
Littelfuse UL Recognized ring lug thermistor probe assemblies are
manufacturing using super stable NTC chips which are potted into
a ring lug housing with thermally conductive epoxy. Designed for
rapid thermal response and excellent long-term stability, these
devices can be used in a wide range of surface temperature
sensing applications.
Features
• Insulated lead wire rated
for 300V minimum
• User selectable
lead length
• Ring tongue mounting
hole diameter 0.145”
nominal
• Ring tongue mounting
hole stud size #6
Dimensions
28 AWG, SINGLE CONDUCTOR
INSULATED WIRE,
UL RATED FOR 300 VOLTS MINIMUM
& 125˚C MINIMUM
Part Numbering System
THERMISTOR ELEMENT POTTED
IN BARREL OF RING LUG HOUSING
BARREL
DIAMETER:
B
A
USUR 10 0 0
Series
C
No Significance
F
D
E
Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details.
KYNAR SHRINK
SLEEVING
Dim “L” is the MIN lead wire length,
and is specified by the last two digits
of the part number (USUR1000-xxx-xx)
e.g. USUR1000-102G-03 would have
a MIN lead wire length of 3”
A
B
C
D
E
F
STRIP in 0.215"
Dimensions
inches.0.280" 0.615" 0.400" DIM “L”
0.250" ± 0.020" ± 0.025" ± 0.025" ± 0.250" (MIN)
± 0.070"
LONG
A
B
C
0.250”
0.215”
0.280”
± 0.070”
28 AWG, SINGLE
CONDUCTOR± 0.025”
±
0.020”
Strip INSULATED WIRE,
THERMISTOR ELEMENT POTTED
IN BARREL OF RING LUG HOUSING
BARREL DIAMETER:
UL RATED FOR 300 VOLTS MINIMUM
STRIP
0.215" ±0.020"
& 125˚C MINIMUM
0.250"
±0.070"
D
E
F
0.615”
± 0.025”
0.400”
± 0.250”
Long
Dim. “L”
Min.
DIM “L” (MINIMUM)
0.280"
±0.025"
0.615"
±0.025"
KYNAR SHRINK SLEEVING
0.400" ±0.250" LONG
© 2018 Littelfuse, Inc. Revised: March 13, 2018
Specifications are subject to change without notice.
1
littelfuse.com
Thermistor Probes and Assemblies
Surface Temperature Sensing
USUR1000 Series UL Recognized Ring Lug Thermistor Assembly
Specifications
Part
Number
Resistance
Ohms @25°C
Resistance Tol.
± % @ 25°C
R-T
Curve
Beta (K)
0-50°C
Max Power
Rating (mW)
Temperature
Rating (°C)
USUR1000-102G
1000
2
J
3892
20
-40 to +125
USUR1000-102H
1000
3
J
3892
20
-40 to +125
USUR1000-102J
1000
5
J
3892
20
-40 to +125
USUR1000-102K
1000
10
J
3892
20
-40 to +125
USUR1000-222G
2252
2
J
3892
20
-40 to +125
USUR1000-222H
2252
3
J
3892
20
-40 to +125
USUR1000-222J
2252
5
J
3892
20
-40 to +125
USUR1000-222K
2252
10
J
3892
20
-40 to +125
USUR1000-302G
3000
2
J
3892
20
-40 to +125
USUR1000-302H
3000
3
J
3892
20
-40 to +125
USUR1000-302J
3000
5
J
3892
20
-40 to +125
USUR1000-302K
3000
10
J
3892
20
-40 to +125
USUR1000-502G
5000
2
J
3892
20
-40 to +125
USUR1000-502H
5000
3
J
3892
20
-40 to +125
USUR1000-502J
5000
5
J
3892
20
-40 to +125
USUR1000-502K
5000
10
J
3892
20
-40 to +125
USUR1000-103G
10000
2
J
3892
20
-40 to +125
USUR1000-103H
10000
3
J
3892
20
-40 to +125
USUR1000-103J
10000
5
J
3892
20
-40 to +125
USUR1000-103K
10000
10
J
3892
20
-40 to +125
© 2018 Littelfuse, Inc. Revised: March 13, 2018
Specifications are subject to change without notice.
2
littelfuse.com
Thermistor Probes and Assemblies
Surface Temperature Sensing
USUR1000 Series UL Recognized Ring Lug Thermistor Assembly
Specifications
Part
Number
Resistance
Ohms @25°C
Resistance Tol.
± % @ 25°C
R-T
Curve
Beta (K)
0-50°C
Max Power
Rating (mW)
Temperature
Rating (°C)
USUR1000-203G
20000
2
J
3892
20
-40 to +125
USUR1000-203H
20000
3
J
3892
20
-40 to +125
USUR1000-203J
20000
5
J
3892
20
-40 to +125
USUR1000-203K
20000
10
J
3892
20
-40 to +125
USUR1000-303G
30000
2
J
3892
20
-40 to +125
USUR1000-303H
30000
3
J
3892
20
-40 to +125
USUR1000-303J
30000
5
J
3892
20
-40 to +125
USUR1000-303K
30000
10
J
3892
20
-40 to +125
USUR1000-503G
50000
2
J
3892
20
-40 to +125
USUR1000-503H
50000
3
J
3892
20
-40 to +125
USUR1000-503J
50000
5
J
3892
20
-40 to +125
USUR1000-503K
50000
10
J
3892
20
-40 to +125
USUR1000-104G
100000
2
J
3892
20
-40 to +125
USUR1000-104H
100000
3
J
3892
20
-40 to +125
USUR1000-104J
100000
5
J
3892
20
-40 to +125
USUR1000-104K
100000
10
J
3892
20
-40 to +125
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
© 2018 Littelfuse, Inc. Revised: March 13, 2018
Specifications are subject to change without notice.
3
littelfuse.com
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