MIL-PRF-23648/9C
FIGURE 2. Derating curve for high ambient temperatures.
3.6 Resistance.
3.6.1 Resistance at 25°C. Standard values shall be as specified in MIL-PRF-23648 except that the 5
percent decade values shall also be used for resistance tolerance G. Minimum and maximum resistance
values shall be in accordance with table I.
TABLE I. Minimum and maximum resistance
values (at 25°C).
Ratio
0.55 (E)
Ohms
10 ohms min
39 kohms max
3.6.2 Resistance at temperatures other than 25°C. Factors for determining resistance at temperatures
other than 25°C are in accordance with table II. The appropriate factor is selected from the column
headed by the resistance range which includes the zero-power 25°C resistance of the thermistor in
question. The 25°C resistance of the thermistor is multiplied by the factor selected to obtain the
resistance at any given temperature.
Example:
Given a thermistor with a 25°C resistance of 220 ohms, find the resistance at 75°C. Select
the factor opposite 75°C from the column headed by the resistance range containing 220
ohms. The factor 1.400 is thus selected from the column headed 180-560. Multiply 220
ohms by the factor 1.400 to obtain the resistance at 75°C of 308 ohms.
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