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Accutrim? 1240 (RJ26 Style)
Vishay Foil Resistors
FIGURE 1 - SCHEMATIC AND DIMENSIONS in Inches (Millimeters)
1240X
1240W
0.050" (1.27 mm) C
0.040" (1.02 mm) C
0.040" (1.02 mm) C
VISHAY
0.250" (6.35 mm) D
0.250" (6.35 mm) D
2
1
VISHAY
3
3
CW
1
CW
1
2
3
2
3
2
1
0.250" (6.35 mm) D
0.050" (1.27 mm) C
0.050" (1.27 mm) C
0.010" (0.25 mm) A
0.050" (1.27 mm) C
0.250" (6.35 mm) D
0.100" (2.54 mm) A
0.175" (4.45 mm) C
0.100" (2.54 mm) A
0.175" (4.45 mm) C
0.050" (1.27 mm) C
0.100" (2.54 mm) A
0.125" (3.1 8 mm) C
(bottom view)
0.100" (2.54 mm) A
0.125" (3.1 8 mm) C
(bottom view)
0.050" (1.27 mm) C
1240P
0.050" (1.27 mm) C
VISHAY
0.175" (4.45 mm) C
1
CW
3
TOLERANCES:
A = ± 0.005" (0.13 mm)
C = ± 0.010" (0.25 mm)
D = ± 0.020" (0.51 mm)
STANDARD MARKING:
Model No.
Date Code
Resistance Value
0.016"
1 2 3
0.250" (6.35mm) D
0.055" (1.40 mm) C
0.035" (0. 8 9 mm) C
NOTES:
Tolerance
(0.41 mm) A
Adjustment screw 0.080" (2.03 mm) diameter with
Resistance
Value
Tolerance
0.100" (2.54 mm) A
0.100" (2.54 mm) A
0.125" (3.1 8 mm) C
0.250" (6.35 mm) D
Model No.
Date Code
0.025" (0.64 mm) X 0.030" (0.76 mm) slot. Tolerance on
screw dimensions is ± 0.005" (0.13 mm). Model 1240
has gold plated terminal pins 0.016" (0.41 mm) ± 0.001"
(0.03 mm) diameter, 0.200" (5.08 mm) length minimum.
FIGURE 2 - POWER DERATING CURVE
FIGURE 3 - 1240W 10 k Ω LOAD LIFE, 20 UNITS,
10 000 h at 0.25 W, + 85 °C (Wiper at CW)
+ 2000
+ 100
+ 8 5 °C
+ 1500
+ 1000
+ 75
+ 500
+ 50
+ 25
0
0
- 500
- 1000
- 75
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
- 1500
Ambient Temperature °C
- 2000
0
2000
4000
6000
8 000
10 000
Time (h)
www.foilresistors.com
2
For any questions, contact: foil@vishaypg.com
Document Number: 63053
Revision: 23-Mar-10
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