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

Series: SM
Littelfuse Surface Mount Thermistors LL-34 MiniMELF - SM image
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Disclaimer Notice

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 CurveOperating TemperatureEngineering DrawingRT TablePartner ECAD ModelsStockSamplesCompare
SM102B1K100010B-55° to 220°CEngineeringRTSM102B1KCheckOrder
SM102D1K100010D2-55° to 220°CEngineeringRTSM102D1KCheck
SM102E1K100010E-55° to 220°CEngineeringRTSM102E1KCheck
SM103F5K1000010F-55° to 220°CEngineeringRTSM103F5K
SM103G1K1000010G-55° to 220°CEngineeringRTSM103G1KCheck
SM103J1F100001J-55° to 220°CEngineeringRTSM103J1FCheckOrder
SM103J1K1000010J-55° to 220°CEngineeringRTSM103J1KCheckOrder
SM104J1F1000001J-55° to 220°CEngineeringRTSM104J1FCheck
SM104J1K10000010J-55° to 220°CEngineeringRTSM104J1K
SM104J1O100000J-55° to 220°CEngineeringRTSM104J1OCheck
SM104R1K10000010R-55° to 220°CEngineeringRTSM104R1KCheck
SM105R1K100000010R-55° to 220°CEngineeringRTSM105R1KCheck
SM153J1K1500010J-55° to 220°CEngineeringRTSM153J1K
SM202F1K200010F-55° to 220°CEngineeringRTSM202F1KCheck
SM203J1K2000010J-55° to 220°CEngineeringRTSM203J1K
SM222E1K218610E1-55° to 220°CEngineeringRTSM222E1KCheck
SM252B1K250010B-55° to 220°CEngineeringRTSM252B1K
SM252B4K250010B-55° to 220°CEngineeringRTSM252B4KCheck
SM253J1K2500010J-55° to 220°CEngineeringRTSM253J1K
SM254R1K25000010R-55° to 220°CEngineeringRTSM254R1KCheck
SM303J1K3000010J-55° to 220°CEngineeringRTSM303J1KCheckOrder
SM403J1K4000010J-55° to 220°CEngineeringRTSM403J1KCheck
SM472F1K470010F-55° to 220°CEngineeringRTSM472F1KCheck
SM472G1K470010G-55° to 220°CEngineeringRTSM472G1KCheck
SM501B1K50010B-55° to 220°CEngineeringRTSM501B1KCheckOrder
SM502F1K500010F-55° to 220°CEngineeringRTSM502F1KCheckOrder
SM503J1K5000010J-55° to 220°CEngineeringRTSM503J1K
SM504R1K50000010R-55° to 220°CEngineeringRTSM504R1KCheck
SM602F1K600010F-55° to 220°CEngineeringRTSM602F1KCheck
Obsolete: 2023 -02-27
100000010V3-55° to 220°CEngineeringRTSM105V3K
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
SM103J1K THERMISTOR, US SENSOR P/ RoHS No 07/12/2021 PbFree No 07/12/2021 Yes
SM103J1K-TR THERMISTOR, U.S. SENSOR RoHS No 07/12/2021 PbFree No 07/12/2021 CoC_RoHS9_SM103J1K-TR REACH201_Declaration_SM103J1K-TR Yes
Does not Contain
SM303J1K THERMISTOR, U.S. SENSOR RoHS No 09/11/2019 PbFree No 09/11/2019 Yes
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