SMR3P (Z1-Foil)
Ultra High Precision Industrial Grade with the Second Generation of Z-Foil (Z1-Foil)
Molded Surface Mount Resistor with TCR down to ± 0.5 ppm/°C Maximum, PCR of ± 5 ppm
at Rated Power, Flexible Terminations, and Load Life Stability of ± 0.005 % (50 ppm)
FEATURES
Temperature coefficient of resistance (TCR):
± 0.5 ppm/°C maximum (+ 25 °C to + 125 °C)
Tolerance: to ± 0.01 %
Power coefficient of resistance (PCR)
“R due to self heating”: 5 ppm at rated power
Flexible terminations ensure minimal stress transference
from the PCB due to load induced temperature gradients
and a difference in thermal coefficient of expansions (TCE)
Electrostatic discharge (ESD) up to 25 000 V
Load life stability: ± 0.005 % (70 °C, 2000 h at rated power)
Resistance range: 100
to 15 k
Vishay Foil resistors are not restricted to standard values;
specific “as-required” values can be supplied at no extra
cost or delivery (e.g. 1K0002 vs. 1K)
Power rating: to 600 mW at 70 °C
Non-inductive, non-capacitive design
Current noise: 0.010 µV
RMS
/V of applied voltage (< - 40 dB)
Voltage coefficient: < 0.1 ppm/V
Non-inductive: < 0.08 µH typical
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Pattern design minimizing hot spots
Terminal finish: lead (Pb)-free or tin/lead alloy
Matched sets with TCR tracking are available upon request
For better performances please contact us
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vpgsensors.com
Compliant to RoHS directive 2002/95/EC
Flexible Termination
INTRODUCTION
Flexible Terminations with Zero TCR
The SMR3P flexible termination resistor with the second
generation of Z-Foil (Z1-Foil) features new orders of accuracy,
stability and speed in a size small enough for permanent
assembly in operational equipment.
It is well known that chips of 1206 and larger dimensions
occasionally delaminate from the printed circuit board or develop
cracks. This is due to stresses introduced into the chip by handling
of the PC board and stress due to thermal shock.
Vishay Foil Resistors (VFR) has introduced a chip in a molded
package with flexible terminations which does not change due to
the above, i.e. no cracks and no separation from the board.
The SMR3P is the industry’s lowest absolute TCR, thus reducing
a major source of uncertainty in precision circuits. The SMR3P
can withstand unconventional environmental conditions,
including the extremely high temperatures and radiation-rich
environments of down-hole oil exploration and well logging, or the
deep-sea underwater repeaters in cross-ocean communications.
The exceptionally-low TCR of the new Z-Foil Bulk Metal
®
Foil
resistor derives from an elegant balance of metallurgical resistivity
and temperature-induced compressive force.
The SMR3P comes with a Load Life Stability certificate:
The Bulk Metal Z-Foil resistor has documented the most precise
load-life stability of any resistor. That’s because the resistance
element is a Bulk Metal Z-alloy that has been applied to a
substrate with a unique formation of a resistive pattern that is
maintained stress-free through the balance of the process,
including termination welding, encapsulation, marking, curing,
etc. Coatings between the element and the external case isolate
the element from external stresses. The flat planar foil very
efficiently transmits heat to the substrate and dissipates it through
the leads and through the package body. The SMR series of
surface-mounts has the further advantage of flexible terminations
to isolate the element from repetitive expansions and contractions
of the board, thereby assuring even better long-term stability.
Moreover, all VFR Bulk Metal Foil resistors are rated to maintain
rated stability at full rated power and temperature. So it is not
necessary to de-rate the foil resistors in application.
Application includes:
1. Secondary standards
2. Feedback devices for operational amplifiers
3. Precision voltage dividers
4. Precision bridge resistors
5. Decade voltage dividers
Our application engineering department is available to advise
and make recommendations. For non-standard technical
requirements and special applications, please contact us.
APPLICATIONS
Precision amplifiers
High precision instrumentation
Medical
Automatic test equipment (ATE)
Industrial
Audio (high end stereo equipment)
EB application
Pulse application
Measurement instrumentation
R
2
R
1
-
+
V
in
V
out
SMR Pair
TABLE 1 - TOLERANCE AND TCR VS.
RESISTANCE VALUE
(1)
VALUE
100
to 15 k
MAXIMUM
MAXIMUM
TIGHTEST TCR (ppm/°C) TCR (ppm/°C)
TOLERANCE
(+ 25 °C to
(- 55 °C to
+ 125 °C)
+ 25 °C)
± 0.01 %
± 0.5
±2
Note
(1)
Tighter performances are available
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63185
Revision: 5-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
SMR3P (Z1-Foil)
FIGURE 1 - POWER DERATING CURVE
200
Percent of Rated Power (%)
175
150
125
100
75
50
25
0
- 75
- 25
+ 25
+ 75
+ 125
Ambient Temperature (°C)
+ 175
- 55 °C
+ 70 °C
FIGURE 2 - TRIMMING TO VALUES
(conceptual illustration)
Interloop
Capacitance
Reduction
in Series
Mutual
Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Current Path
After 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
FIGURE 3 - TYPICAL TCR CURVE Z-FOIL
+ 500
+ 400
+ 300
+ 200
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
0.05 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
+ 25
+ 60
+ 75
+ 100
+ 125
Ambient Temperature (°C)
Note
• For more details, see table 1
FIGURE 4 - THERMAL EXPANSION
VFR Bulk Metal Foil SMR Resistor
Wrap Around Metal Film
Before Thermal Expansion of PCB
Before Thermal Expansion of PCB
Flexible Terminal
Chip Raised
Crack
Soldering Crack
After Thermal Expansion of PCB -
ΔT
After Thermal Expansion of PCB -
ΔT
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2
For any questions, contact
foil@vpgsensors.com
Document Number: 63185
Revision: 5-Mar-15
SMR3P (Z1-Foil)
TABLE 2 - SMR3P PERFORMANCE SPECIFICATIONS
TEST
Resistance Range
Rated Power
Maximum Working Voltage
Maximum Operating Temperature
Working Temperature Range
Thermal Shock
Short Time Overload
Low Temperature Storage
Low Temperature Operation
Dielectric Withstanding Voltage (DWV)
Insulation Resistance (M)
Resistance to Soldering Heat (%)
Moisture Resistance
Shock
Vibration, High Frequency
Load Life Stability (2000 h)
Load Life Stability (10 000 h)
CONDITIONS
100
to 15 k0.6 W at 70 °C; 0.3 W at 125 °C
+ 175 °C (see figure 1)
- 55 °C to + 125 °C (MIL range)
- 65 °C to + 150 °C; 30 min; 5 cycles
6.25 x rated power; 5 s
- 65 °C, 24 h
45 min at rated power at - 65 °C
Atmospheric pressure; AC 200 V; 1 min
DC 100 V; 1 min
260 °C; 10 sec
+ 65 °C to - 10 °C; 90 % to 98 % RH; rated power; 240 h
100 G; sawtooth at 6 ms
10 Hz to 2000 Hz to 10 Hz; 20 G
0.15 W at + 70 °C
0.6 W at + 70 °C
0.3 W at + 125 °C
MAXIMUM LIMIT
(1)
100
to 15 k
See figure 1
180 V
High Temperature Exposure
175 °C; no load 2000 h
Weight
Packaging
Bulk (loose) or tape and reel, per EIA-481-1
Note
(1)
As shown + 0.01
to allow for measurement error at low values
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
over 10 000
± 0.02 % max., ± 0.01 % typ.
± 0.02 % (200 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.002 % typ., ± 0.01 % max.
± 0.005 % typ., ± 0.015 % max.
± 0.005 % typ., ± 0.015 % max.
± 0.005 % typ., ± 0.015 % max.
± 0.015 % typ., ± 0.05 % max.
± 0.015 % typ., ± 0.05 % max.
± 0.05 % (500 ppm)
0.244 g
FIGURE 5 - DIMENSIONS
in inches (millimeters)
Side View
L
TH Minimum
Top View
VALUE (5 DIGITS)
TOLERANCE
Stand Off
P
P
End View
H
100R0T
V
P
(DATE CODE)
-
W
LEAD (Pb)-FREE INDICATOR
Bottom View
TW
MODEL
SMR3P
L
0.287 ± 0.012
(7.29 ± 0.30)
W
0.170 ± 0.012
(4.32 ± 0.30)
H
0.110 ± 0.012
(2.79 ± 0.30)
P
0.051 ± 0.012
(1.30 ± 0.30)
TW
0.095 ± 0.004
(2.41 ± 0.10)
TH (minimum)
0.039
(0.99)
FIGURE 6 - RECOMMENDED MOUNTING PAD GEOMETRIES
in inches (millimeters)
Reflow Solder Pads
D
C
B
E
A
MODEL
SMR3P
METHOD
Reflow
A MIN.
0.118 (3.00)
B REF.
0.106 (2.69)
C REF.
0.175 (4.45)
D ± 0.04 (± 1.02)
0.388 (9.86)
E REF.
0.050 (1.27)
Per IPC-SM-782 Rev. A
Document Number: 63185
Revision: 5-Mar-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
SMR3P (Z1-Foil)
TABLE 3 - GLOBAL PART NUMBER INFORMATION
DENOTES PRECISION
Y
VALUE
R
=
K
= k
(1)
NEW GLOBAL PART NUMBER: Y116810K0000T9R (preferred part number format)
CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
Y
1
1
6
8
1
0
K
0
0
0
0
T
9
R
PRODUCT CODE
1168
= SMR3P
RESISTANCE TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
PACKAGING
L
= bulk pack
R
= tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1168 10K0000 T 9 R:
TYPE: SMR3P
VALUE: 10.0 k
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: Lead (Pb)-free
PACKAGING: Tape and reel
HISTORICAL PART NUMBER: SMR3P 10K000 TCR0.2 T S T (will continue to be used)
SMR3P
MODEL
SMR3P
10K000
OHMIC VALUE
10.0 k
TCR0.2
TCR
CHARACTERISTIC
T
RESISTANCE
TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
S
TERMINATION
S
= lead (Pb)-free
B
= tin/lead
T
PACKAGING
B
= bulk pack
T
= tape and reel
Note
(1)
For non-standard requests, please contact application engineering.
www.vishayfoilresistors.com
4
For any questions, contact
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Document Number: 63185
Revision: 5-Mar-15
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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any other disclosure relating to any product.
The product specifications do not expand or otherwise modify VPG’s terms and conditions of purchase, including but
not limited to, the warranty expressed therein.
VPG makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase.
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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
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responsibility to validate that a particular product with the properties described in the product specification is suitable for
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Product names and markings noted herein may be trademarks of their respective owners.
Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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