SMR3P (Z1-Foil)
Vishay Foil Resistors
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)
“ΔR 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
Ω
to 15 kΩ
•
Vishay Foil resistors are not restricted to standard values;
specific “as-required” values can be supplied at no extra
cost or delivery (e.g. 1K2345 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@vishay.com
•
Compliant to RoHS directive 2002/95/EC
Flexible Termination
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 fall off 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 temperature changes.
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 first low absolute TCR which
eliminates errors due to temperature gradients, 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 other resistor. That’s because the
resistance element is a Bulk Metal Z-alloy that has been applied
to a substrate with a unique process that results in a stress-free
process of forming a resistive pattern in the foil which is
then maintained 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.
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
Ω
to 15 kΩ
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: 01-Dec-09
For any questions, contact:
foil@vishay.com
www.vishay.com
1
SMR3P (Z1-Foil)
Vishay Foil Resistors
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 (MΩ)
Resistance to Soldering Heat (%)
Moisture Resistance
Shock
Vibration, High Frequency
Load Life Stability (2000 h)
CONDITIONS
100
Ω
to 15 kΩ; 0.6 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
Ω
to 15 kΩ
See figure 1
180 V
Load Life Stability (10 000 h)
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
Ω
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 4 - DIMENSIONS
in inches (millimeters)
Side View
L
TH Minimum
Top View
VALUE (5 DIGITS)
TOLERANCE
Z-FOIL
INDICATOR
Stand Off
P
P
End View
H
100R0T
V
z
(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 5 - RECOMMENDED MOUNTING PAD GEOMETRIES
in inches (millimeters)
Reflow Solder Pads
D
C
B
E
A
MODEL
SMR3P
Per IPC-SM-782 Rev. A
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)
Document Number: 63185
Revision: 01-Dec-09
For any questions, contact:
foil@vishay.com
www.vishay.com
3
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
www.vishay.com
1
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