KW Series - Precision Interchangeable Thermistors (135°C) ± 0.5°C Accuracy - Kynar Insulated Leads

Series: KW
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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 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.


  • Kynar insulated lead wires
  • High accuracy
  • 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 ±0.5°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° 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
KW102J21000J3892-80° to 135°CEngineeringRT
KW103G210000G30mW3575-80° to 135°CEngineeringRTOrder
KW103J210000J3892-80° to 135°CEngineeringRTOrder
KW104R2100000R4140-80° to 135°CEngineeringRT
KW203J220000J3892-80° to 135°CEngineeringRT
KW222J22252J3892-80° to 135°CEngineeringRT
KW302J23000J3892-80° to 135°CEngineeringRT
KW303J230000J3892-80° to 135°CEngineeringRTOrder
KW502J25000J3892-80° to 135°CEngineeringRTOrder
KW503J250000J3892-80° to 135°CEngineeringRT
KW503R250000R4140-80° to 135°CEngineeringRT
KW602J26000J3892-80° to 135°CEngineeringRT
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
KW103J2 THERMISTOR, US SENSOR RoHS No 06/21/2019 PbFree No 06/21/2019 CoC_RoHS10_KW103J2 Yes
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pdficon Littelfuse Leaded Thermistors Precision - KW Datasheet