LL-34 MiniMELF - SM Series - Surface Mount NTC LL-34 MiniMELF Style (220°C)

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

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.


  • High temperature capability to +220°C
  • Surface mountable
  • Hermetically sealed glass package
  • Low cost
  • Excellent long-term stability


  • Non-standard resistance values and tolerances
  • Point matched at specified temperatures
  • Tape and reel packaging


  • Thermal time constant: 8 seconds max
  • Dissipation constant: 2 mW/°C

Access specifications, certifications, check availability and order parts below

Catalog #Resis Ω @ 25°CResis Tol ± % @25°CR-T CurveBeta (K) 0-50°COperating TemperatureEngineering DrawingRT TablePartner ECAD ModelsSamplesCompare
SM102B1K100010B2941-55° to 220°CEngineeringRTSM102B1KOrder
SM102D1K100010D23156-55° to 220°CEngineeringRTSM102D1K
SM102E1K100010E3263-55° to 220°CEngineeringRTSM102E1K
SM103G1K1000010G3575-55° to 220°CEngineeringRTSM103G1K
SM103J1F100001J3892-55° to 220°CEngineeringRTSM103J1FOrder
SM103J1K1000010J3892-55° to 220°CEngineeringRTSM103J1KOrder
SM104J1F1000001J3892-55° to 220°CEngineeringRTSM104J1F
SM104J1O100000J3892-55° to 220°CEngineeringRTSM104J1O
SM104R1K10000010R4140-55° to 220°CEngineeringRTSM104R1K
SM105R1K100000010R4140-55° to 220°CEngineeringRTSM105R1K
SM202F1K200010F3419-55° to 220°CEngineeringRTSM202F1K
SM222E1K218610E13320-55° to 220°CEngineeringRTSM222E1K
SM252B4K250010B2941-55° to 220°CEngineeringRTSM252B4K
SM254R1K25000010R4140-55° to 220°CEngineeringRTSM254R1K
SM303J1K3000010J3892-55° to 220°CEngineeringRTSM303J1K
SM403J1K4000010J3892-55° to 220°CEngineeringRTSM403J1K
SM472F1K470010F3419-55° to 220°CEngineeringRTSM472F1K
SM472G1K470010G3575-55° to 220°CEngineeringRTSM472G1K
SM501B1K50010B2941-55° to 220°CEngineeringRTSM501B1KOrder
SM502F1K500010F3419-55° to 220°CEngineeringRTSM502F1K
SM504R1K50000010R4140-55° to 220°CEngineeringRTSM504R1K
SM602F1K600010F3419-55° to 220°CEngineeringRTSM602F1K
Obsolete: 2019 -11-29
1000010F3419-55° to 220°CEngineeringRTSM103F5K
Obsolete: 2018 -11-27
10000010J3892-55° to 220°CEngineeringRTSM104J1K
Obsolete: 2019 -11-29
100000010V34369-55° to 220°CEngineeringRTSM105V3K
Obsolete: 2019 -11-29
1500010J3892-55° to 220°CEngineeringRTSM153J1K
Obsolete: 2019 -11-29
2000010J3892-55° to 220°CEngineeringRTSM203J1K
Obsolete: 2018 -11-27
250010B2941-55° to 220°CEngineeringRTSM252B1K
Obsolete: 2019 -11-29
2500010J3892-55° to 220°CEngineeringRTSM253J1K
Obsolete: 2019 -11-29
5000010J3892-55° to 220°CEngineeringRTSM503J1K
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
SM103J1F THERMISTOR, U.S. SENSOR RoHS No 10/16/2019 PbFree No 10/16/2019 CoC_RoHS9_SM103J1F REACH201_Declaration_SM103J1F Yes
Does not Contain
SM303J1K THERMISTOR, U.S. SENSOR RoHS No 09/11/2019 PbFree No 09/11/2019 Yes
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