Surface Mount Thermistors
MELF Style Thermistor
LL 34 MiniMELF SM
Description
Littelfuse LL-34 “MiniMELF” style glass encapsulated surface
mount thermistors are manufactured using super stable NTC chips
which are hermetically sealed in a glass package. The result is a
device which exhibits excellent long-term reliability and stability
even when subjected to severe environmental or thermal
conditions. Their uniform dimensions make them especially
suitable for use with automatic insertion equipment.
Options
• Non-standard
resistance values
and tolerances
• Point matched at
specified temperatures
• Tape and Reel
Packaging
Dimensions
Features
• High temperature
capability to +220°C
A
• Surface mountable
• Hermetically sealed
TINNED
DUMET
CONTACT
TABS
C
B
• Low cost
• Excellent long-term
stability
glass package
GLASS
BODY
Part Numbering System
SM 10 2 B 1 K
Dimensions shown in inches.
A
0.135”
± 0.012”
B
A
B
0.135"
0.019"
C
C
Series
0.060"
Resistance @ 25ºC
Base Value
± 0.005"
0.019”
0.060”
± 0.012" ± 0.005"
± 0.005”
± 0.005”
Multiplier, power of 10
Resistance Tolerance
F = ±1%
K = ±10%
No Significance
R-T Curve
Ex. 102 = 10 Ω x 102 = 1,000 Ω
Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details.
0.135"
0.012"
TINNED
DUMET
CONTACT
TABS
0.060"
0.005"
0.019"
0.005"
© 2018 Littelfuse, Inc. Revised: February 26, 2018
Specifications are subject to change without notice.
GLASS
BODY
1
littelfuse.com
Surface Mount Thermistors
MELF Style Thermistor
LL 34 MiniMELF SM
Specifications
Beta (K)
0-50°C
Dissipation
Constant,
Nominal
(mW/°C)
Thermal Time
Constant,
Max. Still Air
(seconds)
Temperature
Rating
(°C)
-3.3
2941
2
8
-55 to +220
D2
_
3156
2
8
-55 to +220
10
E
-3.67
3263
2
8
-55 to +220
2000
10
F
-3.86
3419
2
8
-55 to +220
SM222E1K
2186
10
E1
-3.82
3320
2
8
-55 to +220
SM252B1K
2500
10
B
-3.31
2941
2
8
-55 to +220
SM252B4K
2500
10
B
-3.31
2941
2
8
-55 to +220
SM103F5K
10000
10
F
-3.86
3419
2
8
-55 to +220
SM103G1K
10000
10
G
-4.04
3575
2
8
-55 to +220
SM103J1F
10000
1
J
-4.4
3892
2
8
-55 to +220
SM103J1K
10000
10
J
-4.4
3892
2
8
-55 to +220
SM403J1K
10000
10
J
-4.4
3892
2
8
-55 to +220
SM472F1K
10000
10
F
-3.86
3419
2
8
-55 to +220
SM472G1K
10000
10
G
-4.03
3575
2
8
-55 to +220
SM501B1K
10000
10
B
-3.31
2941
2
8
-55 to +220
SM153J1K
15000
10
J
-4.4
3892
2
8
-55 to +220
SM602F1K
15000
10
F
-3.86
3419
2
8
-55 to +220
SM203J1K
20000
10
J
-4.4
3892
2
8
-55 to +220
SM253J1K
25000
10
J
-4.4
3892
2
8
-55 to +220
SM303J1K
30000
10
J
-4.4
3892
2
8
-55 to +220
SM104J1F
100000
1
J
-4.4
3892
2
8
-55 to +220
SM104J1K
100000
10
J
-4.4
3892
2
8
-55 to +220
Part
Number
Resistance
Ohms
@25°C
*Resistance
Tol. ± %
@ 25°C
SM102B1K
1000
SM102D1K
R-T
Curve
Temperature
Coefficient
(%/°C) @ 25°C
10
B
1000
10
SM102E1K
1000
SM202F1K
*Resistance tolerances of ± 1%, 2%, and 5% are available upon request
© 2018 Littelfuse, Inc. Revised: February 26, 2018
Specifications are subject to change without notice.
2
littelfuse.com
Surface Mount Thermistors
MELF Style Thermistor
Specifications
Beta (K)
0-50°C
Dissipation
Constant,
Nominal
(mW/°C)
Thermal Time
Constant,
Max. Still Air
(seconds)
Temperature
Rating
(°C)
-4.4
3892
2
8
-55 to +220
R
-4.68
4140
2
8
-55 to +220
10
F
-3.86
3419
2
8
-55 to +220
100000
10
J
-4.4
3892
2
8
-55 to +220
SM504R1K
100000
10
R
-4.68
4140
2
8
-55 to +220
SM254R1K
250000
10
R
-4.68
4140
2
8
-55 to +220
SM105V3K
1000000
10
V3
-4.93
4369
2
8
-55 to +220
SM105R1K
1000000
10
R
-4.68
4140
2
8
-55 to +220
R-T
Curve
Temperature
Coefficient
(% / °C)
@ 25°C
_
J
100000
10
SM502F1K
100000
SM503J1K
Part
Number
Resistance
Ohms
@25°C
*Resistance
Tol. ± %
@ 25°C
SM104J1O
100000
SM104R1K
*Resistance tolerances of ± 1%, 2%, and 5% are available upon request
Packaging
Packaging Option
Packaging Code
Standard Quantity
Standard
Tape and Reel
-TR
2500
EIA-481
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: February 26, 2018
Specifications are subject to change without notice.
3
littelfuse.com
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