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
TOLERANCE1)
TYPICAL TCR AND
MAX. SPREAD1)
(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
R1
R2
Vin Vout
-
+
SMRxD
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
SMR1D/SMR3D
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63102
2Revision: 23-Mar-10
Note
1. As shown + 0.01 to allow for measurement error at low values
TABLE 3 - PERFORMANCE SPECIFICATIONS
TEST CONDITIONS MAXIMUM LIMIT1)
SMR1D SMR3D SMR1D SMR3D
Resistance Range 5 to 33 k5 to 80 k
Rated Power
5 to 10 k
0.250 W at 70 °C
0.125 W at 125 °C
10 k to 33 k
0.160 W at 70 °C
0.08 W at 125 °C
5 to 30 k
0.6 W at 70 °C
0.3 W at 125 °C
30 k to 80 k
0.4 W at 70 °C
0.2 W at 125 °C
see figure 1
Maximum Working Voltage 73 V 180 V
Maximum Operating
Temperature + 175 °C (see figure 1)
Working Temperature Range - 55 °C to + 125 °C (MIL range)
Thermal Shock - 65 °C to + 150 °C; 30 min; 5 cycles ± 0.01 % (100 ppm)
Short Time Overload 6.25 x rated power; 5 s ± 0.01 % (100 ppm)
Low Temperature Storage 24 h at - 65 °C ± 0.01 % (100 ppm)
Low Temperature Operation 45 min, rated power at - 65 °C ± 0.01 % (100 ppm)
Dielectric Withstanding
Voltage atmospheric pressure; AC 200 V; 1 min ± 0.01 % (100 ppm)
Insulation Resistance (M)DC 100 V; 1 min over 10 000
Resistance to
Soldering Heat (%) 260 °C; 10 s ± 0.02 %, ± 0.01 % typical
Moisture Resistance + 65 °C to - 10 °C; 90 % to 98 % RH; rated power; 240 h ± 0.02 % (200 ppm)
Shock 100 G; sawtooth ± 0.01 % (100 ppm)
Vibration, High Frequency 10 ~ 2000 ~ 10 Hz; 20 G; Y, Z each 4 h ± 0.01 % (100 ppm)
Load Life Stability (2000 h) 0.04 W at + 70 °C
0.25 W at + 70 °C
0.125 W at + 125 °C
0.1 W at + 70 °C
0.6 W at + 70 °C
0.3 W at + 125 °C
Ty p i c a l
0.005 %
0.02 %
0.02 %
Ty p i ca l
0.005 %
0.015 %
0.015 %
High Temperature Exposure 175 °C; no load 2000 h ± 0.05 % (500 ppm)
Weight 0.1143 g 0.244 g
Packaging bulk (loose) or tape and reel, per EIA-481-1
SMR1D/SMR3D
Vishay Foil Resistors
Document Number: 63102 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 23-Mar-10 3
FIGURE 2 - DIMENSIONS in inches (millimeters)
MODEL L W H P TW TH (minimum)
SMR1D 0.236 ± 0.012
(5.99 ± 0.30)
0.126 ± 0.012
(3.20 ± 0.30)
0.098 ± 0.012
(2.49 ± 0.30)
0.051 ± 0.012
(1.30 ± 0.30)
0.087 ± 0.004
(2.21 ± 0.10)
0.039
(0.99)
SMR3D 0.287 ± 0.012
(7.29 ± 0.30)
0.170 ± 0.012
(4.32 ± 0.30)
0.110 ± 0.012
(2.79 ± 0.30)
0.051 ± 0.012
(1.30 ± 0.30)
0.095 ± 0.004
(2.41 ± 0.10)
0.039
(0.99)
TH Minimum
Side View
Stand Off
W
Bottom View
L
PP
End View
H
TW
Top View
100R0T
(DATE CODE) -
V
TOLERANCE
LEAD (Pb)-FREE INDICATOR
VALUE (5 DIGITS)
FIGURE 3 - RECOMMENDED MOUNTING PAD GEOMETRIES in inches (millimeters)
MODEL METHOD A
MIN.
B
REF
C
REF
D
± 0.04 (± 1.02)
E
REF
SMR1D Reflow 0.110
(2.79)
0.106
(2.69)
0.124
(3.15)
0.337
(8.55)
0.050
(1.27)
SMR3D Reflow 0.118
(3.00)
0.106
(2.69)
0.175
(4.45)
0.388
(9.86)
0.050
(1.27)
Per IPC-SM-782 Rev. A
E
A
C
B
D
Reflow Solder Pads
FIGURE 4 - TRIMMING TO VALUES
(conceptual illustration)
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
NOTE: Foil shown in black, etched spaces in white
Current Path
After Trimming
Interloop Capacitance
Reduction in Series
FIGURE 5 - TYPICAL TCR CURVE
(for more details, see table 2)
Note: The TCR values for < 80 are influenced by the
termination composition and the result in deviation from this curve
- 50 - 25 0 + 25 + 50 + 75 + 100 + 125
- 55
± 2 ppm/°C
(+ 25 °C Reference)
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
ΔR
R
(ppm)
Ambient Temperature (°C)
SMR1D/SMR3D
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63102
4Revision: 23-Mar-10
Note
* For non-standard requests, please contact application engineering.
TABLE 4 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y112110K0000T9R (preferred part number format)
DENOTES PRECISION VALUE AER*
YR =
K = k
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
1121 = SMR1D
1169 = SMR3D
T= ± 0.01 %
Q= ± 0.02 %
A= ± 0.05 %
B= ± 0.1 %
C= ± 0.25 %
D= ± 0.5 %
F= ± 1.0 %
L= bulk pack
R= tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1121 10K0000 T 9 R:
TYPE: SMR1D
VALUE: 10.0 k
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: tape and reel
HISTORICAL PART NUMBER: SMR1D 10K000 TCR2 T S T (will continue to be used)
SMR1D 10K000 TCR2 T S T
MODEL OHMIC VALUE TCR
CHARACTERISTIC
RESISTANCE
TOLERANCE TERMINATION PACKAGING
SMR1D
SMR3D
10.0 kT= ± 0.01 %
Q= ± 0.02 %
A= ± 0.05 %
B= ± 0.1 %
C= ± 0.25 %
D= ± 0.5 %
F= ± 1.0 %
S= lead (Pb)-free
B= tin/lead
B= bulk pack
T= tape and reel
1211 K000Y1 0 R0 T 9
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11
