SMR1D Datasheet, PDF (1/3 Pages) Vishay Siliconix – Bulk Metal Foil Technology Precision Molded Surface Mount Resistor

SMR1D
Vishay Foil Resistors
Bulk Metal^® Foil Technology
Precision Molded Surface Mount Resistor
Product may not
be to scale
The SMR1D 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 two values.
The molded SMR1D, 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 BMF
Resistors.”
FEATURES
• Small footprint
• Temperature Coefficient of Resistance — Nominal TCR:
+ 0.6 ppm/°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: 5Ω to 33KΩ
• Tight Tolerances available to ± 0.01 percent
• Power: 0.25 watts @ + 70°C
• Excellent Long Term Stability: ± 0.02% maximum
• Low Thermal EMF: 0.1 m V/°C maximum
• Low Noise, High Frequency Operation
• Matched Sets Available
TABLE 1 - TOLERANCE VERSUS RESISTANCE VALUE
VALUE
(Ω)
100Ω to 33KΩ
20Ω to < 100Ω
10Ω to < 20Ω
5Ω to < 10Ω
STANDARD TOLERANCE
(%)
± 0.01%
± 0.02%
± 0.05%
± 0.10%
FIGURE 1 - NOMINAL TCR
FIGURE 2 - POWER DERATING CURVE
–55
–50
+500
+400
+300
+200
+100
∆R
R0
(ppm)
–100
–200
–300
–400
–500
–25
0
-5 _ppm
+25
+50
+75 +100 +125
+5 ^ppm
Nominal Resistance/
Temperature (RT) Curve
+2.2 ppm/°C
Nominal Chord
Slope (TCR)
–1.8 ppm/°C
Nominal Chord
Slope (TCR)
–55°C / +25°C / +125°C are the test points
with +25°C as the reference temperature
Maximum
Spread
±2.3 ppm/°C
Standard
Spread
±2.0 ppm/°C
–55°C
200%
+70°C
175%
150%
125%
100%
75%
50%
25%
0
–50 –25 0 +25 +50 +75 +100 +125 +150 +175 +200
Ambient Temperature (°C)
VISHAY FOIL • FRANCE +33.4.93.37.28.24 FAX: [phone] • ITALY + 39.2.300.11919 FAX: [phone]
• GERMANY +49.9287.710 FAX: [phone]
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• SINGAPORE +65.788.6668 FAX: [phone]
www.vishay.com
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• SWEDEN +46.8.594.70590 FAX: [phone]
• UK [phone] FAX: [phone]
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Document Number: 63022
Revision 23-Dec-03