Surface Mount Thermistors
MELF Style Thermistor
MM Series LL-31 MicroMELF Thermistors
Description
Littelfuse LL-31 “MicroMELF” 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
Dimensions
capability to +220°C
B
• Surface mountable
TINNED
DUMET
CONTACT
TABS
C
0.049”
± 0.004”
Packaging
• Low cost
• Excellent long-term
stability
Part Numbering System
MM 10 3 E 1 K
Dimensions shown in inches.
B
• Tape and Reel
• Hermetically sealed
glass package
GLASS
BODY
A
specified temperatures
Features
• High temperature
A
• Point matched at
A
B
C
C
Series
0.053"
0.049" 0.075"
0.075”
0.053”NOM
± 0.004" ± 0.008"
± 0.008”
Nom
Resistance @ 25ºC
Base Value
Multiplier, power of 10
Resistance Tolerance
F = ±1%
K = ±10%
No Significance
R-T Curve
Ex. 103 = 10 Ω x 103 = 10,000 Ω
“LL-31” SERIES
Note: Not all combinations of Part Number codes are available. Contact Littelfuse for details.
0.075"
0.008"
TINNED DUMET
CONTACT TABS
0.049"
0.004"
0.053"
NOM
GLASS BODY
© 2018 Littelfuse, Inc. Revised: February 26, 2018
Specifications are subject to change without notice.
1
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Surface Mount Thermistors
MELF Style Thermistor
MM Series LL-31 MicroMELF Thermistors
Specifications
Beta (K)
0-50°C
Dissipation
Constant,
Nominal
(mW/°C)
Thermal
Time
Constant,
Max. Still Air
(seconds)
Temperature
Rating
(°C)
Part
Number
Resistance
Ohms
@25°C
*Resistance
Tol. ± % @
25°C
Accuracy
(±ºC)
0-50ºC
R-T
Curve
Temperature
Coefficient
(% / °C)
@ 25°C
MM222E1K
2186
10
±0.5°C
E1
-3.82
3320
1
5
-55 to +220
MM302F1K
3000
10
±0.5°C
F
-3.86
3419
1
5
-55 to +220
MM502F1K
5000
10
±0.5°C
F
-3.86
3419
1
5
-55 to +220
MM103E1K
10000
10
_
E1
-3.82
3320
1
5
-55 to +220
MM103G1K
10000
10
_
G
-4.03
3575
1
5
-55 to +220
MM103J1F
10000
1
_
J
-4.4
3892
1
5
-55 to +220
MM103J1K
10000
10
_
J
-4.4
3892
1
5
-55 to +220
MM153J1K
15000
10
_
J
-4.4
3892
1
5
-55 to +220
MM203J1F
20000
1
_
J
-4.4
3892
1
5
-55 to +220
MM203J1K
20000
10
±0.5°C
J
-4.4
3892
1
5
-55 to +220
MM104J1F
100000
1
_
J
-4.4
3892
1
5
-55 to +220
MM104J1K
100000
10
_
J
-4.4
3892
1
5
-55 to +220
MM104R1K
100000
10
_
R
-4.68
4140
1
5
-55 to +220
MM254R1K
250000
10
±0.5°C
R
-4.68
4140
1
5
-55 to +220
*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.
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