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
Ω
to 20 kΩ (higher values
from 20 kΩ to 150 kΩ 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 “ΔR 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@vishay.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
(Ω)
250 to 20K
100 to < 250
50 to < 100
25 to < 50
10 to < 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: 30-Mar-09
- 50
- 25
0
+ 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
For any questions, contact:
foil@vishay.com
www.vishay.com
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
Ω
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
(Ω)
10 to 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
Ω
to allow for measurement errors at low values.
MIL-PRF-55342
CHARACTERISTIC E
ΔR
LIMITS
± 0.1 %
± 0.1 %
± 0.1 %
± 0.1 %
± 0.2 %
± 0.2 %
± 0.5 %
TYPICAL
ΔR
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
ΔR
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:
foil@vishay.com
Document Number: 63142
Revision: 30-Mar-09
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
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