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SMR1D/SMR3D
Vishay Foil Resistors
FIGURE 2 - DIMENSIONS in inches (millimeters)
Side View
L
TH Minim u m
V ALUE (5 DIGITS)
V
Top View
100R0T
(DATE CODE)
-
TOLERA N CE
Stand Off
W
P
P
End View
H
LEAD (P b )-FREE I N DICATOR
Bottom View
T W
MODEL
SMR1D
SMR3D
L
0.236 ± 0.012
(5.99 ± 0.30)
0.287 ± 0.012
(7.29 ± 0.30)
W
0.126 ± 0.012
(3.20 ± 0.30)
0.170 ± 0.012
(4.32 ± 0.30)
H
0.098 ± 0.012
(2.49 ± 0.30)
0.110 ± 0.012
(2.79 ± 0.30)
P
0.051 ± 0.012
(1.30 ± 0.30)
0.051 ± 0.012
(1.30 ± 0.30)
TW
0.087 ± 0.004
(2.21 ± 0.10)
0.095 ± 0.004
(2.41 ± 0.10)
TH (minimum)
0.039
(0.99)
0.039
(0.99)
FIGURE 3 - RECOMMENDED MOUNTING PAD GEOMETRIES in inches (millimeters)
Reflow Solder Pads
D
B
C
E
A
MODEL
SMR1D
SMR3D
METHOD
Reflow
Reflow
A
MIN.
0.110
(2.79)
0.118
(3.00)
B
REF
0.106
(2.69)
0.106
(2.69)
C
REF
0.124
(3.15)
0.175
(4.45)
D
± 0.04 (± 1.02)
0.337
(8.55)
0.388
(9.86)
E
REF
0.050
(1.27)
0.050
(1.27)
Per IPC-SM-782 Rev. A
FIGURE 4 - TRIMMING TO VALUES
(conceptual illustration)
FIGURE 5 - TYPICAL TCR CURVE
(for more details, see table 2)
+ 150
+ 100
Interloop Capacitance
Red u ction in Series
C u rrent Path
Before Trimming
Δ R
R
+ 50
0
M u t u al Ind u ctance
Red u ction d u e
to Change in
C u rrent Direction
C u rrent Path
After Trimming
Trimming Process
Remo v es this Material
from Shorting Strip Area
Changing C u rrent Path
and Increasing
Resistance
(ppm)
- 50
- 100
- 150
- 200
± 2 ppm/°C
(+ 25 °C Reference)
- 50
- 25
0
+ 25
+ 50
+ 75
+ 100
+ 125
NOTE: Foil sho w n in b lack, etched spaces in w hite
- 55
Ambient Temperature (°C)
Note: The TCR values for < 80 ? are influenced by the
termination composition and the result in deviation from this curve
Document Number: 63102
Revision: 23-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
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