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)
SMR3P (Z1-Foil)
Vishay Foil Resistors
Document Number: 63185 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 29-Mar-10 1
INTRODUCTION
Flexible Terminations with Zero TCR
Vishay’s new 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 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 Vishay 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.
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 µVRMS/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@vishaypg.com
Compliant to RoHS directive 2002/95/EC
APPLICATIONS
Precision amplifiers
High precision instrumentation
Medical
Automatic test equipment (ATE)
Industrial
Audio (high end stereo equipment)
EB application
Pulse application
Measurement instrumentation
Note
(1) Tighter performances are available
* Pb containing terminations are not RoHS compliant, exemptions may apply
Flexible Termination
TABLE 1 - TOLERANCE AND TCR VS.
RESISTANCE VALUE (1)
VALUE TIGHTEST
TOLERANCE
MAXIMUM
TCR (ppm/°C)
(+ 25 °C to
+ 125 °C)
MAXIMUM
TCR (ppm/°C)
(- 55 °C to
+ 25 °C)
100 to 15 k± 0.01 % ± 0.5 ± 2
R1
R2
Vin Vout
-
+
SMR Pair
SMR3P (Z1-Foil)
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63185
2Revision: 29-Mar-10
Note
• For more details, see table 1
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
FIGURE 2 - TRIMMING TO VALUES
(conceptual illustration)
Note: Foil shown in black, etched spaces in white
Mutual
Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Interloop
Capacitance
Reduction
in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Current Path
After Trimming
FIGURE 3 - TYPICAL TCR CURVE Z-FOIL
FIGURE 4 - THERMAL EXPANSION
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
Ambient Temperature (°C)
ΔR
R
(ppm) 0.05 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
- 400
+ 300
+ 400
+ 25 + 60 + 125+ 100+ 75
Vishay Bulk Metall Foil SMR Resistor
Before Thermal Expansion of PCB
After Thermal Expansion of PCB - ΔT
Flexible Terminal
Wrap Around Metal Film
Before Thermal Expansion of PCB
After Thermal Expansion of PCB - ΔT
Soldering Crack
Chip Raised
Crack
SMR3P (Z1-Foil)
Vishay Foil Resistors
Document Number: 63185 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 29-Mar-10 3
Note
(1) As shown + 0.01 to allow for measurement error at low values
TABLE 2 - SMR3P PERFORMANCE SPECIFICATIONS
TEST CONDITIONS MAXIMUM LIMIT (1)
Resistance Range 100 to 15 k
Rated Power 100 to 15 k0.6 W at 70 °C; 0.3 W at 125 °C See figure 1
Maximum Working Voltage 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 - 65 °C, 24 h ± 0.01 % (100 ppm)
Low Temperature Operation 45 min at rated power at - 65 °C ± 0.01 % (100 ppm)
Dielectric Withstanding Voltage (DWV) 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 sec ± 0.02 % max., ± 0.01 % typ.
Moisture Resistance + 65 °C to - 10 °C; 90 % to 98 % RH; rated power; 240 h ± 0.02 % (200 ppm)
Shock 100 G; sawtooth at 6 ms ± 0.01 % (100 ppm)
Vibration, High Frequency 10 Hz to 2000 Hz to 10 Hz; 20 G ± 0.01 % (100 ppm)
Load Life Stability (2000 h) 0.15 W at + 70 °C
0.6 W at + 70 °C
0.3 W at + 125 °C
± 0.002 % typ., ± 0.01 % max.
± 0.005 % typ., ± 0.015 % max.
± 0.005 % typ., ± 0.015 % max.
Load Life Stability (10 000 h)
± 0.005 % typ., ± 0.015 % max.
± 0.015 % typ., ± 0.05 % max.
± 0.015 % typ., ± 0.05 % max.
High Temperature Exposure 175 °C; no load 2000 h ± 0.05 % (500 ppm)
Weight 0.244 g
Packaging Bulk (loose) or tape and reel, per EIA-481-1
FIGURE 4 - DIMENSIONS in inches (millimeters)
MODEL L W H P TW TH (minimum)
SMR3P 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 5 - RECOMMENDED MOUNTING PAD GEOMETRIES in inches (millimeters)
MODEL METHOD A MIN. B REF. C REF. D ± 0.04 (± 1.02) E REF.
SMR3P 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
TH Minimum
Side View
Stand Off
W
Bottom View
L
PP
End View
H
TW
Top View
100R0T
(DATE CODE)
-
V
z
TOLERANCE
Z-FOIL
INDICATOR
LEAD (Pb)-FREE INDICATOR
VALUE (5 DIGITS)
E
A
C
B
D
Reflow Solder Pads
SMR3P (Z1-Foil)
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63185
4Revision: 29-Mar-10
Note
(1) For non-standard requests, please contact application engineering.
TABLE 3 - GLOBAL PART NUMBER INFORMATION (1)
NEW GLOBAL PART NUMBER: Y116810K0000T9R (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
YR =
K = k
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
1168 = SMR3P 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 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 10K000 TCR0.2 T S T
MODEL OHMIC VALUE TCR
CHARACTERISTIC
RESISTANCE
TOLERANCE TERMINATION PACKAGING
SMR3P 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
1681 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
