FIGURE 3 - POWER DERATING CURVE
200 %
175 %
150 %
125 %
100 %
75 %
50 %
25 %
0 %
- 75
Ambient Temperature (°C)
Percent of Rated Power at + 125 °C
- 55 °C
Double Rated Power
Rated Power
2001751501251007550250- 25- 50
+ 70 °C
Document Number: 63001 For any questions, contact www.vishayfoilresistors.com
Revision: 02-Mar-15 foil@vpgsensors.com 3
S Series
FIGURE 4 - TRIMMING TO VALUES
(conceptual illustration)
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before Trimming
Note: Foil shown in black, etched spaces in white
Interloop Capacitance
Reduction in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Current Path
After Trimming
TABLE 3 - ENVIRONMENTAL PERFORMANCE COMPARISON
MIL-PRF-55182
CHAR J
S-SERIES
MAXIMUM R
S-SERIES
TYPICAL R
Test Group I
Thermal shock, 5 x (- 65 °C to + 150 °C) ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Short time overload, 6.25 x rated power ± 0.2 % ± 0.01 % (100 ppm) ± 0.003 % (30 ppm)
Test Group II
Resistance temperature characteristics
(1)
± 25 ppm/°C ± 6.5 ppm/°C ± 2.0 ppm/°C
Low temperature storage (24 h at - 65 °C) ± 0.15 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Low temperature operation
(45 min, rated power at - 65 °C)
± 0.15 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Terminal strength ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Test Group III
Dielectric Withstanding Voltage (DWV) ± 0.15 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Resistance to solder heat ± 0.1 % ± 0.01 % (100 ppm) ± 0.005 % (50 ppm)
Moisture resistance ± 0.4 % ± 0.05 % (500 ppm) ± 0.01 % (100 ppm)
Test Group IV
Shock ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Vibration ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Test Group V
Life test at 0.3 W/+ 125 °C
2000 h ± 0.5 % ± 0.015 % (150 ppm) ± 0.01 % (100 ppm)
10 000 h ± 2.0 % ± 0.05 % (500 ppm) ± 0.03 % (300 ppm)
Test Group Va
Life test at 0.6 W (2 x rated power)/+ 70 °C, 2000 h ± 0.5 % ± 0.015 % (150 ppm) ± 0.01 % (100 ppm)
Test Group VI
High temperature exposure (2000 h at + 175 °C) ± 2.0 % ± 0.1 % (1000 ppm) ± 0.05 % (500 ppm)
Test Group VII
Voltage coefficient 5 ppm/V < 0.1 ppm/V < 0.1 ppm/V
(1)
See Table 1.