MIL-PRF-23648-19 Resistor, Thermal \(Thermistor\), Hermetically Sealed, Positive Temperature Coefficient, Style Rth42This specification covers the detail requirements for style RTH42 thermistors. This style is available in resistance ratio E only. Terminal leads type S and W are available. Resistance tolerance versus temperature characteristics G, J, and K are applicable through the maximum temperature of 125 degrees C.

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MIL-PRF-23648/19C

2.3 Order of precedence. In the event of a conflict between the text of this document and the

references cited herein, the text of this document takes precedence. Nothing in this document, however,

supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Requirements. Requirements shall be in accordance with MIL-PRF-23648, and as specified herein.

3.2 Interface and physical dimensions. The thermistors shall meet the interface and physical

dimensions as specified on figure 1 and herein.

3.3 Thermal time constant. The thermal time constant shall be 60 seconds maximum.

3.4 Dissipation constant. The dissipation constant shall be 2.5 milliwatts per degrees Celsius minimum.

3.5 Power rating. The thermistor shall be capable of dissipating a maximum power of 0.25 watts at

25�C. Thermistors shall be derated in accordance with figure 2.

Inch

0.08

0.003

0.25

0.010

0.38

0.015

0.51

0.020

2.54

0.100

7.24

0.285

1.20

30.48

NOTES:

1. Dimensions are in inches.

2. Metric equivalents are given for general information only.

FIGURE 1. Style RTH42 thermistors.