KT Series - Standard Precision Interchangeable Thermistors (135°C) ± 0.2°C Accuracy - Kynar Insulated Leads

Series: KT
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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 standard precision interchangeable thermistors are low cost, highly accurate, stable devices designed specifically for temperature sensing and control applications. They are particularly suited for uses where their precision interchangeability eliminates the necessity for costly individual circuit calibration.


  • High accuracy
  • Kynar insulated lead wire
  • Fast thermal response time
  • Low cost
  • Small size
  • Epoxy encapsulated
  • Excellent long-term stability
  • R/T Curve-matched


  • Special lead materials and lengths
  • Special encapsulants or probe housings
  • Non-standard resistance values and tolerances


  • Interchangeability accuracy of ±0.2°C (0°C to +70°C)
  • Thermal time constant: 1 second max. in a well stirred oil bath, 10 seconds max. in still air
  • Dissipation constant: 1 mW/°C
  • Maximum power rating: 30 mW at 25°C derated to 1 mW at 125°C
  • Operating temperature range: -80°C to +135°C
  • Storage and operation temperatures for best long-term stability: -80°C to +120°C

Access specifications, certifications, check availability and order parts below

Catalog #Resis Ω @ 25°CR-T CurveMax Power RatingBeta (K) 0-50°COperating TemperatureEngineering DrawingRT TableSamplesCompare
KT102J21000J30mW3892-80° to 135°CEngineeringRT
KT103G210000G30mW3575-80° to 135°CEngineeringRTOrder
KT103J210000J30mW3892-80° to 135°CEngineeringRTOrder
KT104R2100000R30mW4140-80° to 135°CEngineeringRT
KT203J220000J30mW3892-80° to 135°CEngineeringRT
KT222J22252J30mW3892-80° to 135°CEngineeringRT
KT302J23000J30mW3892-80° to 135°CEngineeringRTOrder
KT303J230000J30mW3892-80° to 135°CEngineeringRTOrder
KT502J25000J30mW3892-80° to 135°CEngineeringRT
KT503J250000J30mW3892-80° to 135°CEngineeringRT
KT503R250000R30mW4140-80° to 135°CEngineeringRT
KT602J26000J30mW3892-80° to 135°CEngineeringRT
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
KT103G2 THERMISTOR, US SENSOR RoHS No 01/19/2021 PbFree No 01/19/2021 CoC_RoHS10_KT103G2_01-20-2021 REACH209_Declaration_KT103G2_01-20-2021 Yes
Does not Contain
KT103J2 THERMISTOR, US SENSOR RoHS No 07/01/2019 PbFree No 07/01/2019 CoC_RoHS10_KT103J2_07-02-2019 REACH197_Declaration_KT103J2_07-02-2019 Yes
Does not Contain
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pdf icon Sensing Products Selection Guide

This guide provides an introduction to magnetic sensing and options for value-added custom design packages.

pdficon Littelfuse Leaded Thermistors Standard Precision - KT Datasheet