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For technical questions in the Americas, contact foilsupport1@vishay.com
For technical questions in Asia/Japan/Europe/Africa/Israel, contact foilsupport2@vishay.com
Document Number: 63021
Revision 16-Aug-04
www.vishay.com
20
SMR3D
Vishay Foil Resistors
S
ISRAEL: foilsales.israel@vishay.com FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com AMERICAS: foilsales.usa@vishay.com
ASIA/JAPAN: foilsales.asia@vishay.com UK/HOLLAND/SCANDANAVIA: foilsales.eunorth@vishay.com GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com
SALES
FEATURES
Performance Similar to Time Tested S102 Through Hole
Resistor
Temperature Coefficient of Resistance — Nominal TCR:
+ 0.6ppm/
°
C (0
°
C to + 25
°
C);
– 0.6ppm/
°
C (+ 25
°
C to + 60
°
C)
+ 2.2ppm/
°
C (- 55
°
C to + 25
°
C)
- 1.8ppm/
°
C (+ 25
°
C to + 125
°
C)
Value Range: 5
to 80K
Tight Tolerances: available to
±
0.01 percent
Power: 0.6 watts @ + 70
°
C
Excellent Long Term Stability:
±
0.015%
Low Thermal EMF: 0.1
μ
V/
°
C maximum
Low Noise, High Frequency Operation
Matched Sets Available
Terminal Finishes Available:
Lead (Pb)-free (Sn 100%)
Tin/Lead Alloy (Sn 60% Pb 40%)
Bulk Metal
Foil Technology
Precision Molded Surface Mount Resistor
200%
175%
150%
125%
100%
75%
50%
25%
0
Ambient Temperature (
°
C)
P
°
C
–55
°
C
+70
°
C
–50
–25
0
+25
+50
+75
+100 +125 +150 +175 +200
FIGURE 2 - POWER DERATING CURVE
The SMR3D is a truly precision molded surface mountable
resistor offering all the elements of precision; including lowest
TCR, tight tolerances, long term stability, low noise, low thermal
EMF, and non-measurable voltage coefficient. It utilizes the
Bulk Metal
Foil technology for the resistive element with its
inherent and legendary low predictable TCR* and long term
stability. This surface mountable product affords similar performance
to the time tested S102 molded through-hole product.
Voltage division with tight tracking < 3ppm can be achieved
with 2 randomly selected units even with a large ratio between
the 2 values.
The molded SMR3D, while slightly larger and heavier than the
Bulk Metal
Foil VSM surface mountable chip resistor, has a
rugged construction capable of withstanding significant thermal
cycling and allows for board installation without concern for
tolerance shifts due to manufacturing processes or mechanical
stresses.
*Reference Reason 1 in “7 Technical Reasons to specify BULK
METAL
FOIL Resistors.”
Product may not
be to scale
FIGURE 1 - NOMINAL TCR
Maximum
±
2.3 ppm/
°
C
+125
–55
–50
–25
0
+25
+50
+75
+100
+500
+400
+300
+200
+100
0
–100
–200
–300
–400
–500
Standard
2.0 ppm/
±
°
C
°
C
+2.2 ppm/
Slope (TCR)
–1.8 ppm/
C
Nominal Chord
–55
C / +25
C / +125
C are the test points
with +25
°
C as the reference temperature
R
(pR
Nominal Resistance/
+5ppm
-5ppm
TABLE 1 - TOLERANCE VERSUS RESISTANCE VALUE
VALUE
(
)
STANDARD TOLERANCE
(%)
100
to 80k
±
0.01
20
to < 100
±
0.02
10
to 20
±
0.05
5
to 10
±
0.10