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Military Grade Leaded Thermistors
PTC Military Grade Thermistors
PTC TABLE 2 Resistance Multipliers for RTH22
TEMPERATURE 10 TO 68 OHMS 82 TO 150 OHMS 180 TO 560 OHMS 680 TO 1500 OHMS 1.8K TO 10K OHMS
–55°C 0.615 0.582 0.560 0.550 0.515
–15°C 0.790 0.770 0.755 0.740 0.730
0°C 0.863 0.847 0.838 0.835 0.825
25°C 1.000 1.000 1.000 1.000 1.000
50°C 1.160 1.170 1.180 1.200 1.230
75°C 1.350 1.370 1.400 1.420 1.450
100°C 1.545 1.584 1.623 1.656 1.670
125°C 1.750 1.800 1.860 1.920 1.960
PTC TABLE 1 Resistance Multipliers for RTH42
TEMPERATURE 10 TO 68 OHMS 82 TO 150 OHMS 180 TO 470 OHMS 560 TO 1200 OHMS 1500 TO 5600 OHMS 6800 TO 10,000 OHMS
–55°C 0.615 0.582 0.560 0.550 0.515 0.510
–15°C 0.790 0.770 0.755 0.740 0.730 0.730
0°C 0.863 0.847 0.838 0.835 0.825 0.825
25°C 1.000 1.000 1.000 1.000 1.000 1.000
50°C 1.160 1.170 1.180 1.200 1.230 1.190
75°C 1.350 1.370 1.400 1.420 1.450 1.400
100°C 1.545 1.584 1.623 1.656 1.670 1.610
125°C 1.750 1.800 1.860 1.920 1.960 1.830
Ordering Information
Tolerance Code
Number of Zeros
1st 2 Resistance Digits
Style Designation
RTH42ES 202J
Tolerance:
K=10%
J= 5%
PTC TABLE 3 Device Tolerance at Temperatures Other Than 25ºC
SEQUENCE TEMPERATURE J +/–% K +/–%
1 –55°C 20 25
2 –15°C 13 18
30°C712
4 25°C 5 10
5 50°C 7 12
6 75°C 9 14
7 100°C 12 17
8 125°C 15 20
100
80
60
40
20
0
-.55 -.20 0 20 40 80 120 140 160
25°C
125°C
TABLE 4 Derating Curve for High Ambient Temperatures
Ambient Temperature (°C)
Percent of Maximum Power
RTH42 and RTH22 Military Grade PTC thermis-
tors meet or exceed the requirements of MIL-
PRF-23648 including:
• Short time overload
• Low temperature storage
• High temperature storage
• Terminal strength
• Thermal shock
• Resistance to soldering heat
• Moisture resistance
• Life
• High temperature
exposure
• Vibration, high
frequency
• Shock, specified pulse
• Seal
• Immersion
• Resistance to solvents
Any of the above tests, or tests dictated by your application, can be
performed at Quality Thermistor on the specific lot you are ordering.
Contact QTI Technical Support for details.
OPERATING STANDARD POWER RATING AT THERMAL TIME CONSTANT
TYPE TEMP. RANGE RESISTANCE RANGE 25°C IN WATTS SECONDS MAXIMUM
RTH22 MIL-PRF-23648/9 –55°C TO +125°C 10 – 10K ohms .500 @ 25°C 60
derate per
RTH42 MIL-PRF-23648/19 –55°C TO +125°C 10 – 10K ohms .250 @ 25°C 60
derate per
Table 4
Table 4
*COMMERCIAL GRADE AVAILABLE, CONTACT FACTORY FOR DETAILS
Military Grade
PTC THERMISTORS
