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© 2018 Littelfuse, Inc. Revised: March 13, 2018
Specifications are subject to change without notice.
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.
Dimensions
Dimensions in inches.
Surface Temperature Sensing
Thermistor Probes and Assemblies
USUR1000 Series UL Recognized Ring Lug Thermistor Assembly
BARREL DIAMETER:
0.215" ±0.020"
THERMISTOR ELEMENT POTTED
IN BARREL OF RING LUG HOUSING
0.280"
±0.025"
0.615"
±0.025"
DIM “L” (MINIMUM)
KYNAR SHRINK SLEEVING
0.400" ±0.250" LONG
STRIP
0.250"
±0.070"
28 AWG, SINGLE CONDUCTOR
INSULATED WIRE,
UL RATED FOR 300 VOLTS MINIMUM
& 125˚C MINIMUM
BARREL
DIAMETER:
0.215"
± 0.020"
THERMISTOR ELEMENT POTTED
IN BARREL OF RING LUG HOUSING
0.280"
± 0.025"
0.615"
± 0.025"
DIM “L”
(MIN)
KYNAR SHRINK
SLEEVING
0.400"
± 0.250"
LONG
STRIP
0.250"
± 0.070"
28 AWG, SINGLE CONDUCTOR
INSULATED WIRE,
UL RATED FOR 300 VOLTS MINIMUM
& 125˚C MINIMUM
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
E
F
C
B
D
A B C D E F
A B C
0.250”
± 0.070”
Strip
0.215”
± 0.020”
0.280”
± 0.025”
D E F
0.615”
± 0.025”
0.400”
± 0.250”
Long
Dim. “L”
Min.
Part Numbering System
Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details.
USUR 1000
Series
No Significance
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
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2littelfuse.com
© 2018 Littelfuse, Inc. Revised: March 13, 2018
Specifications are subject to change without notice.
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 J3892 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 J3892 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 J3892 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 J3892 20 -40 to +125
Surface Temperature Sensing
Thermistor Probes and Assemblies
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3littelfuse.com
© 2018 Littelfuse, Inc. Revised: March 13, 2018
Specifications are subject to change without notice.
Surface Temperature Sensing
Thermistor Probes and Assemblies
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 J3892 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 J3892 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 J3892 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
USUR1000 Series UL Recognized Ring Lug Thermistor Assembly
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