High Precision Bulk Metal
®
Foil Molded Surface Mount Resistor
with TCR down to ± 2 ppm/°C
, Flexible Terminations,
and Load Life Stability of ± 0.005 %
(50 ppm)
SMR1D/SMR3D
Vishay Foil Resistors
Document Number: 63102 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 23-Mar-10 1
Any value at any tolerance available within resistance range
INTRODUCTION
The SMRxD is a precision molded surface mountable
resistor offering all the elements of precision; including low
TCR, tight tolerance, 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 low and predictable TCR and long
term stability. This surface mountable product affords similar
performance to the time tested S series molded through-hole
product.
The flexible terminations of this product also reduce
stress transference from the PCB to the resistor.
Voltage division with tight tracking < 3 ppm/°C can be
achieved with 2 randomly selected units even with a large
ratio between the two values.
Our Application Engineering Department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.
Note
1. Tighter performances are available
FEATURES
Temperature coefficient of resistance (TCR):
± 2 ppm°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.)
Tolerance: to ± 0.01 %
Flexible terminations ensure minimal stress
transference from the PCB due to a difference
in thermal coefficient of expansions (TCE)
Electrostatic discharge (ESD) above 25 000 V
Load life stability: ± 0.005 % (70 °C, 2000 h at rated power)
Resistance range: 5 to 80 k (for higher and lower
values, please contact us)
Power rating: to 600 mW at 70 °C
Non inductive, non capacitive design
Current noise: - 40 dB
Voltage coefficient: < 0.1 ppm/V
Non inductive: < 0.08 µH
Non hot spot design
Terminal finishes available: lead (Pb)-free
tin/lead alloy
Matched sets with TCR tracking are available upon request
Any value available within resistance range (e.g. 1K234)
Prototype samples available from 48 h. For more
information, please contact foil@vishaypg.com
For better performances please review SMRxDZ datasheet
APPLICATIONS
Military, airborne and space
Precision amplifiers
High precision instrumentation
Medical
Automatic test equipment (ATE)
Industrial
Audio (high end stereo
equipment)
EB application
Pulse application
Measurement instrumentation
* Pb containing terminations are not RoHS compliant, exemptions may apply
TABLE 1 - THE SMRxD SERIES IS LISTED
IN THE FOLLOWING DSCC
SPECIFICATIONS
MODEL DSCC MIL SPEC
SMR1D 06020 MIL-PRF-55182
SMR3D 06021 MIL-PRF-55182
TABLE 2 - TOLERANCE AND TCR VERSUS
RESISTANCE VALUE
(- 55 °C to + 125 °C, + 25 °C ref.)
VALUE
STANDARD
TOLERANCE
1)
TYPICAL TCR AND
MAX. SPREAD
1)
(ppm/°C)
50 to 80 k ± 0.01 % ± 2 ± 3
20 to < 50 ± 0.02 % ± 2 ± 4
10 to < 20 ± 0.05 % ± 2 ± 6
5 to < 10 ± 0.1 % ± 2 ± 8
FIGURE 1 - POWER DERATING CURVE
200
175
150
125
100
75
50
25
0
- 75 - 25 + 25 + 75 + 125 + 175
Ambient Temperature (°C)
Percent of Rated Power (%)
- 55 °C + 70 °C
