VSMP2018 (Z-Foil)
Vishay Foil Resistors
Ultra High Precision Foil Wraparound Surface Mount Chip Resistor
with Temperature Coefficient of Resistance (TCR) of ± 0.05 ppm/°C,
and Load Life Stability of ± 0.005 % (50 ppm)
FEATURES
Temperature coefficient of resistance (TCR):
0.05 ppm/°C typical (0 °C to + 60 °C)
0.2 ppm/°C typical (- 55 °C to + 125 °C, + 25 °C ref.)
Resistance range: 10 to 20 k(higher values
from 20 k to 150 k can be supplied on request)
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)
Tolerance: to ± 0.01 %
Power coefficient “R due to self heating”:
5 ppm at rated power
Power rating: to 750 mW at + 70 °C
Load life stability: to ± 0.005 % at 70 °C, 2000 h at rated
power
Electrostatic discharge (ESD) up to 25 000 V
Short time overload:
0.005 %
Non-inductive, non-capacitive design
Rise time: 1 ns effectively no ringing
Current noise: - 40 dB
Voltage coefficient < 0.1 ppm/V
Non inductive: < 0.08 µH
Non hot spot design
Terminal finish: lead (Pb)-free, tin/lead alloy
Compliant to RoHS directive 2002/95/EC
Matched sets are available on request
Prototype quantities available in just 5 working days or
sooner, please contact
foil@vishaypg.com
For better performances please contact us
Top View
INTRODUCTION
Vishay VSMP2018 ultra high precision Bulk Metal
®
Z-Foil
resistor is the result of a new concept in resistors
manufacturing: A proprietary Bulk Metal Foil of known and
controllable properties is applied to a special ceramic
substrate. A resistive pattern is then photoetched by an
ultra-fine technique developed by Vishay.
This process results in a resistor element that combines the
all important characteristics of low temperature coefficient
(TCR), long-term stability, ESD immunity, tight tolerance,
non-inductance, low capacitance and low noise.
These characteristics are optimum, approaching in total
performance the theoretical ideal, a straight wire.
The behavior of Vishay resistors under load is characterized
by a very small initial resistance change which occurs within
the first 500 h of the test. Only insignificant resistance
changes are observed upon continuation of the test, and no
signs of wear out appear even at full load over several
thousands hours.
The VSMP has a full wraparound termination which ensures
safe handling during the manufacturing process, as well as
providing stability during multiple thermal cyclings.
Our application engineering department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us using the e-mail address in the footer below.
APPLICATIONS
Automatic test equipment (ATE)
High precision instrumentation
Laboratory, industrial and medical
Audio
EB applications (electron beam scanning and recording
equipment, electron microscopes)
Down hole instrumentation
Communication
TABLE 1 - TOLERANCE AND TCR VS.
RESISTANCE VALUE
(1)
(- 55 °C to + 125 °C, + 25 °C Ref.)
RESISTANCE
VALUE
()
250to 20K
100to < 250
50to < 100
25to < 50
10to < 25
TOLERANCE
(%)
± 0.01
± 0.02
± 0.05
± 0.1
± 0.25
TYPICAL TCR AND
MAX. SPREAD
(ppm/°C)
± 0.2 ± 1.8
± 0.2 ± 1.8
± 0.2 ± 2.8
± 0.2 ± 3.8
± 0.2 ± 3.8
FIGURE 1 - POWER DERATING CURVE
Percent of Rated Power
- 55 °C
100
75
50
25
0
- 75
+ 70 °C
Note
(1)
For tighter performances and non-standard values up to 150K,
please contact Vishay application engineering using the e-mail
address in the footer below.
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63142
Revision: 26-Mar-10
- 50
- 25
0
+ 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
For any questions, contact:
foil@vishaypg.com
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1
VSMP2018 (Z-Foil)
Vishay Foil Resistors
FIGURE 2 - TRIMMING TO VALUES
(Conceptual Illustration)
FIGURE 3 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
+ 500
+ 400
+ 300
+ 200
Interloop Capacitance
Reduction in Series
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
- 55
- 0.16 ppm/°C
- 25
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
Mutual Inductance
Reduction due
to Change in
Current Direction
0
+ 25
+ 60 + 75 + 100 + 125
Ambient Temperature (°C) and
TCR Chord Slopes for Different Temperature Ranges
Note:
Foil shown in
black,
etched spaces in
white
Note
• The TCR values for < 100
are influenced by the termination
composition and result in deviation from this curve.
TABLE 2 - DIMENSIONS AND LAND PATTERN
in inches (millimeters)
Bottom View for Mounting
Uncoated
L
Ceramic
W
D
CHIP
SIZE
2018
L
± 0.005 (0.13)
0.204 (5.18)
W
± 0.005 (0.13)
0.184 (4.67)
THICKNESS
MAXIMUM
0.025 (0.64)
D
± 0.005 (0.13)
0.018 (0.46)
Z
(1)
0.248 (6.30)
G
(1)
0.146 (3.71)
X
(1)
0.184 (4.67)
Recommended Land Pattern
X
T
G
Z
Footprint
Note
(1)
Land pattern dimensions are per IPC-7351A.
TABLE 3 - SPECIFICATIONS
CHIP
SIZE
2018
RATED POWER (mW)
at + 70 °C
750
MAX. WORKING
VOLTAGE
P
R
RESISTANCE RANGE
()
10to 20K
MAXIMUM WEIGHT
(mg)
40
TABLE 4 - PERFORMANCES
TEST
(CONDITIONS PER MIL-PRF-55342)
Thermal Shock, 100 x (- 65 °C to + 150 °C)
Low Temperature Operation, - 65 °C, 45 min at 0.75 W
Short Time Overload, 6.25 x 0.75 W, 5 s
High Temperature Exposure, 150 °C, 100 h
Resistance to Soldering Heat
Moisture Resistance
Load Life Stability, + 70 °C for 2000 h at Rated Power
Note
(1)
As shown + 0.01
to allow for measurement errors at low values.
MIL-PRF-55342
CHARACTERISTIC E
R
LIMITS
± 0.1 %
± 0.1 %
± 0.1 %
± 0.1 %
± 0.2 %
± 0.2 %
± 0.5 %
TYPICAL
R
LIMITS
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
± 0.01 % (100 ppm)
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
MAXIMUM
R
LIMITS
(1)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.02 % (200 ppm)
± 0.01 % (100 ppm)
± 0.02 % (200 ppm)
± 0.01 % (100 ppm)
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For any questions, contact:
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Document Number: 63142
Revision: 26-Mar-10
VSMP2018 (Z-Foil)
Vishay Foil Resistors
FIGURE 4 - 100 CYCLE THERMAL SHOCK - 65 °C TO 150 °C, 10 UNITS EACH VALUE
250
200
150
100
50
0
- 50
VSMP2018
10R
VSMP2018
20K
FIGURE 5 - LOAD LIFE STABILITY 2000 h AT + 70 °C, 0.75 W, 20 UNITS EACH VALUE
400
350
300
ΔR/R
(ppm)
ΔR/R
(ppm)
250
200
150
100
50
0
- 50
VSMP2018
10R
VSMP2018
20K
FIGURE 6 - RECOMMENDED MOUNTING
25
%
to
85 %
of T
A low profile solder fillet is
recommended to avoid
unnecessary
stresses along top edge of
metallization. IR and
vapor
phase
reflow are
best.
Notes
• Avoid the use of cleaning agents which could attack epoxy resins, which form part of the resistor construction
• Vacuum pick up is recommended for handling
• Soldering iron may damage the resistor
Document Number: 63142
Revision: 26-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
3
VSMP2018 (Z-Foil)
Vishay Foil Resistors
TABLE 5 - GLOBAL PART NUMBER INFORMATION
(1)
NEW GLOBAL PART NUMBER: Y163712K7560T9R (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
K
= k
CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
Y
1
6
3
7
1
2
K
7
5
6
0
T
9
R
PRODUCT CODE
1637
= VSMP2018
RESISTANCE TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.10 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
PACKAGING
R
= tape and reel
W
= waffle pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1637 12K7560 T 9 R:
TYPE: VSMP2018
VALUES: 12.7560 k
ABSOLUTE TOLERANCE: 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: tape and reel
HISTORICAL PART NUMBER: VSMP2018 12K756 TCR0.2 T S T (will continue to be used)
VSMP2018
MODEL
VSMP2018
12K756
RESISTANCE VALUE
12.756 k
TCR0.2
TCR
CHARACTERISTICS
T
TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.10 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
S
TERMINATION
S
= lead (Pb)-free
B
= tin/lead
T
PACKAGING
T
= tape and reel
W
= waffle pack
Note
(1)
For non-standard requests, please contact application engineering.
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For any questions, contact:
foil@vishaypg.com
Document Number: 63142
Revision: 26-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 application.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by
any conduct of Vishay Precision Group.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
expressly indicated. Customers using or selling Vishay Precision Group products not expressly indicated for use
in such applications do so entirely at their own risk and agree to fully indemnify Vishay Precision Group for any
damages arising or resulting from such use or sale. Please contact authorized Vishay Precision Group 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 No.: 63999
Revision: 27-Apr-11
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