SMR1D/SMR3D
Vishay Foil Resistors
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)
FEATURES
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.
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
APPLICATIONS
Military, airborne and space
Precision amplifiers
High precision instrumentation
Medical
Automatic test equipment (ATE)
Industrial
Audio (high end stereo
Vin
equipment)
EB application
Pulse application
Measurement instrumentation
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
Note
1. Tighter performances are available
R2
R1
-
Vout
+
SMRxD
FIGURE 1 - POWER DERATING CURVE
200
Percent of Rated Power (%)
Any value at any tolerance available within resistance range
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
- 55 °C
+ 70 °C
175
150
125
100
75
50
25
0
- 75
- 25
+ 25
+ 75
+ 125
Ambient Temperature (°C)
+ 175
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63102
Revision: 23-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
1
SMR1D/SMR3D
Vishay Foil Resistors
TABLE 3 - PERFORMANCE SPECIFICATIONS
TEST
MAXIMUM LIMIT1)
CONDITIONS
SMR1D
SMR3D
Resistance Range
Rated Power
10 k to 33 k
5 to 10 k
0.250 W at 70 °C 0.160 W at 70 °C
0.125 W at 125 °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
Maximum Working Voltage
Maximum Operating
Temperature
Working Temperature Range
Thermal Shock
Short Time Overload
Dielectric Withstanding
Voltage
High Temperature Exposure
180 V
± 0.01 % (100 ppm)
6.25 x rated power; 5 s
± 0.01 % (100 ppm)
24 h at - 65 °C
± 0.01 % (100 ppm)
45 min, rated power at - 65 °C
± 0.01 % (100 ppm)
atmospheric pressure; AC 200 V; 1 min
± 0.01 % (100 ppm)
DC 100 V; 1 min
over 10 000
260 °C; 10 s
± 0.02 %, ± 0.01 % typical
+ 65 °C to - 10 °C; 90 % to 98 % RH; rated power; 240 h
± 0.02 % (200 ppm)
100 G; sawtooth
± 0.01 % (100 ppm)
10 ~ 2000 ~ 10 Hz; 20 G; Y, Z each 4 h
± 0.01 % (100 ppm)
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
175 °C; no load 2000 h
Weight
Packaging
see figure 1
- 65 °C to + 150 °C; 30 min; 5 cycles
Shock
Load Life Stability (2000 h)
5 to 80 k
- 55 °C to + 125 °C (MIL range)
Resistance to
Soldering Heat (%)
Vibration, High Frequency
5 to 33 k
+ 175 °C (see figure 1)
Insulation Resistance (M)
Moisture Resistance
SMR3D
73 V
Low Temperature Storage
Low Temperature Operation
SMR1D
Typical
0.005 %
0.02 %
0.02 %
Typical
0.005 %
0.015 %
0.015 %
± 0.05 % (500 ppm)
0.1143 g
0.244 g
bulk (loose) or tape and reel, per EIA-481-1
Note
1. As shown + 0.01 to allow for measurement error at low values
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Document Number: 63102
Revision: 23-Mar-10
SMR1D/SMR3D
Vishay Foil Resistors
FIGURE 2 - DIMENSIONS in inches (millimeters)
Side View
L
TH Minimum
VALUE (5 DIGITS)
Top View
P
P
H
100R0T
V
End View
Stand Off
TOLERANCE
W
-
(DATE CODE)
TW
Bottom View
LEAD (Pb)-FREE INDICATOR
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)
FIGURE 3 - RECOMMENDED MOUNTING PAD GEOMETRIES in inches (millimeters)
Reflow Solder Pads
D
C
B
E
A
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
FIGURE 4 - TRIMMING TO VALUES
(conceptual illustration)
FIGURE 5 - TYPICAL TCR CURVE
(for more details, see table 2)
+ 150
+ 100
Current Path
Before Trimming
Interloop Capacitance
Reduction in Series
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Mutual Inductance
Reduction due
to Change in
Current Direction
+ 50
ΔR
R
(ppm)
0
- 50
- 100
± 2 ppm/°C
(+ 25 °C Reference)
- 150
- 200
- 50
- 55
NOTE: Foil shown in black, etched spaces in white
- 25
0
+ 25
+ 50
+ 75
+ 100
+ 125
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
3
SMR1D/SMR3D
Vishay Foil Resistors
TABLE 4 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y112110K0000T9R (preferred part number format)
DENOTES PRECISION
VALUE
R=
K = k
Y
Y
1
AER*
1
2
1
1
0
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
K
0
0
PRODUCT CODE
RESISTANCE TOLERANCE
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 %
0
0
T
9
R
PACKAGING
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 k
S = lead (Pb)-free
B = tin/lead
B = bulk pack
T = tape and reel
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
C = ± 0.25 %
D = ± 0.5 %
F = ± 1.0 %
Note
* For non-standard requests, please contact application engineering.
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For any questions, contact: foil@vishaypg.com
Document Number: 63102
Revision: 23-Mar-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and
conditions of purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms
and conditions of purchase. To the maximum extent permitted by applicable law, Vishay Precision
Group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and
all liability, including without limitation special, consequential or incidental damages, and (iii) any and
all implied warranties, including warranties of fitness for particular purpose, non-infringement and
merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different
applications and performance may vary over time. Statements regarding the suitability of products for
certain types of applications are based on Vishay Precision Group’s knowledge of typical requirements that
are often placed on Vishay Precision Group products. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular
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Document No.: 63999
Revision: 27-Apr-2011
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