PTC Military Grade Thermistors
Military Grade Leaded Thermistors
tors meet or exceed the requirements of MIL-
Tolerance Code
Number of Zeros
1st 2 Resistance Digits
Style Designation
PRF-23648 including:
• High temperature
exposure
• Vibration, high
frequency
• Shock, specified pulse
• Seal
• Immersion
• Resistance to solvents
Tolerance:
K = 10%
J = 5%
Military Grade
• Short time overload
• Low temperature storage
• High temperature storage
• Terminal strength
• Thermal shock
• Resistance to soldering heat
• Moisture resistance
• Life
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.
*COMMERCIAL GRADE AVAILABLE, CONTACT FACTORY FOR DETAILS
TYPE
RTH22 MIL-PRF-23648/9
OPERATING
TEMP. RANGE
–55°C TO +125°C
STANDARD
RESISTANCE RANGE
10 – 10K ohms
POWER RATING AT
25°C IN WATTS
.500 @ 25°C
derate per
Table 4
THERMAL TIME CONSTANT
SECONDS MAXIMUM
60
RTH42 MIL-PRF-23648/19
–55°C TO +125°C
10 – 10K ohms
.250 @ 25°C
derate per
Table 4
60
1500 TO 5600 OHMS
0.515
0.730
0.825
1.000
1.230
1.450
1.670
1.960
6800 TO 10,000 OHMS
0.510
0.730
0.825
1.000
1.190
1.400
1.610
1.830
PTC TABLE 2 Resistance Multipliers for RTH22
TEMPERATURE
10 TO 68 OHMS
–55°C
0.615
–15°C
0.790
0°C
0.863
25°C
1.000
50°C
1.160
75°C
1.350
100°C
1.545
125°C
1.750
180 TO 470 OHMS
0.560
0.755
0.838
1.000
1.180
1.400
1.623
1.860
82 TO 150 OHMS
0.582
0.770
0.847
1.000
1.170
1.370
1.584
1.800
PTC TABLE 3 Device Tolerance at Temperatures Other Than 25ºC
SEQUENCE
TEMPERATURE
J +/–%
K +/–%
1
–55°C
20
25
2
–15°C
13
18
3
0°C
7
12
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
800-554-4784
560 TO 1200 OHMS
0.550
0.740
0.835
1.000
1.200
1.420
1.656
1.920
180 TO 560 OHMS
0.560
0.755
0.838
1.000
1.180
1.400
1.623
1.860
680 TO 1500 OHMS
0.550
0.740
0.835
1.000
1.200
1.420
1.656
1.920
1.8K TO 10K OHMS
0.515
0.730
0.825
1.000
1.230
1.450
1.670
1.960
TABLE 4 Derating Curve for High Ambient Temperatures
Percent of Maximum Power
PTC TABLE 1 Resistance Multipliers for RTH42
TEMPERATURE
10 TO 68 OHMS
82 TO 150 OHMS
–55°C
0.615
0.582
–15°C
0.790
0.770
0°C
0.863
0.847
25°C
1.000
1.000
50°C
1.160
1.170
75°C
1.350
1.370
100°C
1.545
1.584
125°C
1.750
1.800
100
25°C
80
60
40
20
125°C
0
-.55
-.20
w w w. t h e r m i s t o r. c o m
0
20
40
80
120
140
160
Ambient Temperature (°C)
25
PTC THERMISTORS
Ordering Information
R T H 4 2 E S 2 02 J
RTH42 and RTH22 Military Grade PTC thermis-
