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NASA Qualified epoxy encapsulated precision interchangeable NTC thermistors for use in extended space flight applications.  All parts are fully flight tested and characterized. Line re-qualified yearly per MIL-PRF-23648 requirements as specified in GSFC S-311-P-18 document. All GSFC S-311-P-18 (S311P18) lead options wire options available.


  • Flight Qualified
  • 2252 Ohm to 30K Ohm Resistance @ 25°C
  • Interchangeability to ±0.1°C
  • Excellent High Temperature Performance
  • High Sensitivity
  • Thermally Conductive Epoxy Coating Exhibits <0.66% TML, <0.01% CVCM, 0.10% WVR when tested per ASTM E-595-90 


  • Extended Space Applications
  • Low and Mid Range Temperature Applications
  • Tight Tolerance Instrumentation
  • Applications Requiring Sensing Small Changes in Temperature
  • Applications with Out-gassing Requirements  

±0.2°C Interchangeability Tolerance 0°C – 70°C

Part Number GSFC S-3118-P-18 Number Basic MEAS Thermistor  Zero Power Resistance ohm at 25°C  Beta 0- 50°C (K)  Operating & Storage Temperature*  Color Code Body  End 
44901 -01S7R6 44004 2252 3891 -55 -+ 90°C Black Yellow
44903 -03S7R6 44005 3000 3891 -55 -+ 90°C Black Green
44905 -05S7R6 44007 5000 3891 -55 -+ 90°C Black Violet
44907 -07S7R6 44006 10K 3574 -55 -+ 90°C Black Blue
44909 -09S7R6 44008 30K 3810 -55 -+ 90°C Black Gray

±0.1°C Interchangeability Tolerance 0°C – 70°C

Part Number GSFC S-3118-P-18 Number Basic MEAS Thermistor Zero Power Resistance ohm at 25°C Beta 0- 50°C (K)  Operating & Storage Temperature* Color Code Body End
44902 -02S7R6 44033 2252 3891 -55 -+ 70°C Orange Orange
44904 -04S7R6 44030 3000 3891 -55 -+ 70°C Orange Black
44906 -06S7R6 44034 5000 3891 -55 -+ 70°C Orange Yellow
44908 -08S7R6 44031 10K 3574 -55 -+ 70°C Orange Brown
44910 -010S7R6 44032 30K 3810 -55 -+ 70°C Orange Red

Note: *Thermistors with ± 0.2°C interchangeability tolerance may have short-term operating temperature excursions to 150°C. Thermistors with ± 0.1°C interchangeability tolerance may have short-term operating temperature excursions to 100°C


Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Model Number  44900 Series

  • Sensor Type  NTC Thermistor

  • Tolerance β-Value (%) .3

Body Features

  • Wire Connection  Open End


  • Wire Length (mm) 76

Usage Conditions

  • Ambient Temperature Range (°C) 100

  • T_ref for Resistance (°C) 25

  • Temperature Accuracy (°C) ± .1 from 0 – 70


  • Wire/Cladding Connection  32 AWG (.2mm) Alloy 180 Tin Plated

Packaging Features

  • Package  Epoxy Radial Discrete

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Datasheets & Catalog Pages

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