26
Engineering Information
Thermal time constant: 30 seconds max in still air
Power rating: .125 W at 25 c, derate to 0 at 125
Dissipation constant: 1.25mW/°C min in still air
Resistance at 25C: 10 ohms to 10Kohms (see table)
100
80
60
40
20
0
-55 -20 0 20 40 80 120 140 160
25°C
125°C
TABLE 1 Derating Curve for High Ambient Temperatures
Ambient Temperature (°C)
Percent of Maximum Power
PTC Military Grade Thermistors
Dscc (Defense Supply Center, Columbus) issued
specification MIL-PRF-32192 dictating the performance
and inspection requirements for these devices which
includes a test for wire bonding integrity. Many leading
Aerospace companies around the world have selected these
components for their mission critical space flight applications.
Quality Thermistor has summarized the requirements of the
MIL-PRF-32192 specification on this catalog page. The
complete detailedMIL-PRF-32192 specification can be
obtained by contacting the DSCC.
The High-Rel Positive Temperature Coefficient chip
thermistor is designed for wire bonding applications
found in hybrid circuitry. The devices exhibit a linear
Resistance vs. Temperature curve approximating
0.7%/C which make them the ideal solution for
temperature compensation applications.
Quality Thermistor, Inc. is
AS9100 certified
Dimension 10-12 15-1800 2200-4700 5600 10000
+/-.010(0.254) OHMS OHMS OHMS OHMS OHMS
L 0.032(0.812) 0.032(0.812) 0.038(0.965) 0.030(0.762) 0.022(0.558)
W 0.032(0.812) 0.032(0.812) 0.038(0.965) 0.030(0.762) 0.022(0.558)
T 0.028(0.711) 0.050(1.27) 0.072(1.828) 0.072(1.828) 0.072(1.828)
Standard Configuration
Metalized Terminations
Silicon Core
TABLE 4 Termination Materials
TYPE MATERIAL CODE
Epoxy Bondable Gold G
Epoxy Bondable Platinum Gold U
Epoxy Bondable Platinum Gold T
Epoxy Bondable Palladium Silver or Platinum Silver C
Epoxy Bondable Palladium Silver or Platinum Silver D
Wire Bondable Silver S
Wire Bondable Gold W
Ordering Information
M32192 E 1 W 500 1 J M Level Designator
Tolerance Code
4th Resistance Digit
1st 3 Resistance Digits
Termination Finish
MIL-PRF-32192 Slash
Sheet Designation
Resistance/Temperature
Ratio
DSCC Drawing Number
TABLE 2 Factors for determining resistance at various temperatures.
TEMPERATURE 10-27 33-68 82-330 390-2.7k 3.3k-10k
°C OHMS OHMS OHMS OHMS OHMS
–55°C 0.552 0.519 0.493 0.481 0.493
–15°C 0.739 0.728 0.716 0.709 0.717
0°C 0.830 0.822 0.813 0.810 0.816
25°C 1.000 1.000 1.000 1.000 1.000
50°C 1.190 1.201 1.208 1.211 1.205
75°C 1.408 1.411 1.441 1.446 1.430
100°C 1.651 1.669 1.706 1.709 1.660
125°C 1.908 1.940 1.993 1.983 1.862
TABLE 3 Resistance tolerance at temperatures other than 25°C.
TEMPERATURE F G J K
°C PERCENT (±) PERCENT (±) PERCENT (±) PERCENT (±)
–55°C 15 17 20 25
–15°C 9 10 13 18
0°C 3 4 7 12
25°C 1 2 5 10
50°C 3 4 7 12
75°C 5 6 9 14
100°C 7 9 12 17
125°C 10 12 15 20
Military Grade
PTC THERMISTORS
Military Grade Chip Thermistors
