Thermistors from Littelfuse, Inc.

Glass Encapsulated Thermistors -- 104JM1A

Glass Encapsulated Thermistors -- 104JM1A -- View Larger Image
Glass Encapsulated Thermistors -- 104JM1A-Image

Littelfuse low cost interchangeable glass encapsulated thermistors are manufactured using super stable, precision NTC chips which are hermetically sealed in a glass (DO-35 diode style) package. The result is a device which exhibits excellent long term reliability and stability even when subjected to severe environmental or thermal conditions. They are well suited for uses where their interchangeability eliminates the necessity for costly individual circuit calibration. Their uniform dimensions and axial lead configuration make them especially suitable for use with automatic insertion equipment.


  • High temperature capability to +300°C
  • Hermetically sealed glass package
  • High accuracy
  • Low cost
  • Excellent long-term stability
  • High voltage insulation
  • Tinned CCS lead wires are solderable or weldable


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


  • Interchangeability accuracy of ±1.0°C (0°C to +100°C)
  • Thermal time constant: 5 seconds (still air)
  • Thermal time constant: 0.5 seconds (stirred liquid)
  • Dissipation constant: 2 mW/°C (still air)

Product Category
Operating Specifications
Temperature Range
-55 to 300 C (-67 to 572 F)

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Resistance (@25°C)