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VAR
Vishay Foil Resistors
FIGURE 2 - STANDARD DIMENSIONS
L
W
H
This product is fragile
and may be damaged
if mishandled.
VPG assumes no
responsibility for
LL
Soldered PCB
damage caused by
improper handling.
Lead Material #22 AWG
Round Solder Coated Copper
LS
TABLE 2 - SPECIFICATIONS
RESISTANCE RANGE
( ? )
MAXIMUM
WORKING
VOLTAGE
AMBIENT
POWER RATING
at at
+ 70 °C + 125 °C
INCHES
DIMENSIONS
mm
10 to 100K
200
0.4 W
0.2 W
W: 0.080 max. ?
L: 0.250 max. ?
H: 0.310 max. ?
LL: 1.000 ± 0.125 ?
LS (1) : 0.150 ±
0.005
W: 2.03 max. ?
L: 6.35 max. ?
H: 7.87 max. ?
LL: 25.4 ± 3.18 ?
LS: 3.81 ± 0.13
Note
1. An additional lead space option is available: 0.200" (5.08 mm). For these specifications - please specify VARJ (see Table 3) when placing
an order.
FIGURE 3 - POWER DERATING CURVE
- 55 °C + 70 °C
200 %
Double Rated Power
175 %
FIGURE 4 - TRIMMING TO VALUES ?
(Conceptual Illustration)
150 %
125 %
100 %
75 %
50 %
25 %
0
Rated Power
Interloop Capacitance
Reduction in Series
Mutual Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
- 75
- 50
- 25
0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
Note: Foil shown in black, etched spaces in white
?
To acquire a precision resistance value, the Bulk Metal Foil
chip is trimmed by selectively removing built-in “shorting
bars.” To increase the resistance in known increments,
marked areas are cut, producing progressively smaller
increases in resistance. This method reduces the effect of
“hot spot” and improves the long term stability of the hybrid
chips.
Document Number: 63140
Revision: 03-Jan-12
For any questions, contact: foil@vishaypg.com
www.vishayfoilresistors.com
3
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