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MIL-PRF-23648-20 Resistor, Thermal \(Thermistor\), Insulated Negative Temperature Coefficient Style Rth44This specification covers the detail requirements for style RTH44 thermistors. This style is available in resistance ratios A, B, and C. The only terminal lead available is S type. Resistance tolerance versus temperature characteristics F, G, J, and K are applicable through the maximum temperature of 125 Degrees C.

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MIL-PRF-23648/20C
TABLE II. Resistance temperature characteristic factors.
Temperature
Ratio
Ratio
Ratio
(°C)
19.8 (A)
29.4 (B)
48.7 (C)
-55
54.9
100
----
-15
5.77
7.38
8.80
0
2.85
3.27
3.66
25
1.00
1.00
1.00
50
0.405
0.360
0.320
75
0.184
0.148
0.116
100
0.0923
0.0675
0.047
125
0.0503
0.0340
0.021
3.7 Short time overload. The maximum allowable change in zero-power resistance as the result of the
short time load test shall be ±2 percent.
3.8 Low temperature storage. The maximum allowable change in zero-power resistance as the result
of the low temperature storage test shall be ±2 percent.
3.9 High temperature storage. The maximum allowable change in zero-power resistance as the result
of the high temperature storage test shall be ±2 percent.
3.10 Terminal strength. When tested in accordance with 4.2, the maximum allowable change in zero-
power resistance shall be ±1 percent.
3.11 Thermal shock. The maximum allowable change in zero-power resistance as the result of the
thermal shock test shall be ±2 percent.
3.12 Resistance to soldering heat. The maximum allowable change in zero-power resistance as the
result of the resistance to soldering heat test shall be ±3 percent.
3.13 Moisture resistance. The maximum allowable change in zero-power resistance as the result of the
moisture resistance test shall be ±5 percent.
3.14 Life. The maximum allowable change in zero-power resistance as the result of the life test shall be
±5 percent.
3.15 High temperature exposure. The maximum allowable change in zero-power resistance as the
result of the high temperature exposure test shall be ±2 percent after 100 hours, and ±3 percent after
1,000 hours.
3.16 Vibration, high frequency. The maximum allowable change in zero-power resistance as the result
of the vibration test shall be ±2 percent.
3.17 Shock, specified pulse. The maximum allowable change in zero-power resistance as the result of
the shock test shall be ±2 percent.
3.18 Immersion. The maximum allowable change in zero-power resistance as the result of the
immersion test shall be ±3 percent.
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