VCS1625Z (Z-Foil)
Vishay Foil Resistors
Ultra High Precision Z-Foil Surface Mount Current
Sensing Chip Resistor with TCR of ± 0.05 ppm/°C and
Power Coefficient of 5 ppm at Rated Power
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.) (see table 1)
Resistance range: 0.3
to 10
(for
higher or
lower values please contact us)
Foil resistors are not restricted to standard values, we can
supply specific “as required” values at no extra cost or
delivery (e.g. 1.234
vs. 1
)
Tolerance: to ± 0.2 %
Power coefficient “R due to self heating”: 5 ppm at rated
power
Load life stability: 0.02 % at 70 °C, 2000 h at rated power
Electrostatic discharge (ESD) up to 25 000 V
Short time overload < 0.005 %
Power rating: 0.5 W at + 70 °C (figure 1)
Non inductive, non capacitive design
Rise time: 1 ns effectively no ringing
Current rating: 5 A maximum
Current noise: < - 40 dB
Voltage coefficient: < 0.1 ppm/V
Non inductive: < 0.08 µH
Non hot spot design
Prototype samples available from 72 h. For more
information, please contact
foil@vishaypg.com
For better performances please contact us
INTRODUCTION
The Z-foil technology provides a significant reduction of the
resistive component’s sensitivity to ambient temperature
variations (TCR) and applied power changes (PCR).
Designers can now guarantee a high degree of stability and
accuracy in fixed-resistor applications using solutions
based on Vishay‘s revolutionary Z-foil technology.
Model VCS1625Z is a surface mount chip resistor designed
with 4 pads for Kelvin connection. Utilizing Vishay’s Bulk
Metal
®
Z-foil as the resistance element, it provides
performance capabilities far greater than other resistor
technologies can supply in a product of comparable size.
0.05 ppm/°C absolute TCR removes errors due to
temperature gradients.
This small device dissipates heat almost entirely through the
pads so surface mount users are encouraged to be generous
with the board’s pads and traces.
Our application engineering department is available to
advise and to make recommendations. For non-standard
technical requirements and special applications, please
contact us.
IM
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FIGURE 1 - POWER DERATING CURVE
Percent of Rated Power
- 55 °C
+ 70 °C
100
75
50
25
0
- 75
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
TABLE 1 - SPECIFICATIONS
(2)
MODEL
NUMBER
RESISTANCE
RANGE
> 2.0
to 10
0.3
to 2.0
RESISTANCE
TOLERANCE
TYPICAL TCR and MAX. SPREAD
(- 55 °C to + 125 °C, + 25 °C)
± 0.2 ± 2.8 ppm/°C
VCS1625Z
± 0.2 %, ± 0.5 %; ± 1.0 %
± 0.5 %; ± 1.0 %
Notes
(1)
Whichever is lower
(2)
Tighter performances are available. Please contact application engineering
foil@vishaypg.com
* Pb containing materials are not RoHS compliant, exemptions may apply
Document Number: 63094
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
PR
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DU
CT
TERMINATIONS
Two lead (Pb)-free options are available:
gold plated or tin plated
Tin/lead plated
APPLICATIONS
Military
I
Medical
Automatic test equipment (ATE)
E
E
Airborne (in heads-up display
I
V
systems)
High precision instrumentation
Electron beam recording equipment
Electron microscopes
Current sensing applications
Forced balance electronic scales
Applications that require superior frequency stability
R
1
1
2
I
I
2
POWER RATING
at + 70 °C
(1)
0.5 W on FR4 PCB
MAXIMUM
CURRENT
(1)
5A
VCS1625Z (Z-Foil)
Vishay Foil Resistors
FIGURE 2 - DIMENSIONS
in inches (millimeters)
Solder Pad Layout
L
W
Mounting
Pads (4)
I1
A
Electrical
Schematic
I
1
E
1
R
0.200
(5.08)
E1
0.070
(1.78)
B
H
I2
E2
Top View
Bottom View
INCHES
L
H
W
A
B
0.250 ± 0.010
0.160 ± 0.010
0.040 maximum
0.080 ± 0.005
0.040 ± 0.010
FIGURE 3 - TRIMMING TO VALUES
(Conceptual Illustration)
IM
PR
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VE
D
Interloop Capacitance
Reduction in Series
Current Path
Before Trimming
Mutual Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
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
TABLE 2 - PERFORMANCE SPECIFICATIONS
TEST
Thermal shock 5 x (- 65 °C to + 150 °C)
Low temperature operation
Short time overload
High temperature exposure
Resistance to soldering heat
Moisture resistance
Load life 2000 h at 70 °C: rated power on ceramic PCB
Note
(1)
Measurement error 0.001R
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2
For any questions, contact:
foil@vishaypg.com
PR
O
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CT
I
2
E
2
0.260
(6.60)
0.070
(1.78)
MILLIMETERS
6.35 ± 0.25
4.06 ± 0.25
1.02 maximum
2.03 ± 0.13
1.02 ± 0.25
FIGURE 4 - TYPICAL TCR CURVE Z-FOIL
+ 500
+ 400
+ 300
+ 200
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
- 55
- 25
0
+ 25
+ 60 + 75
+ 100 + 125
- 0.16 ppm/°C
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
Ambient Temperature (°C)
MIL-PRF-55342
R
LIMITS
± 0.10 %
± 0.10 %
± 0.10 %
± 0.10 %
± 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)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.02 % (200 ppm)
MAXIMUM
R
LIMITS
(1)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.02 % (200 ppm)
± 0.02 % (200 ppm)
± 0.03 % (300 ppm)
± 0.03 % (300 ppm)
± 0.04 % (400 ppm)
Document Number: 63094
Revision: 23-Mar-10
VCS1625Z (Z-Foil)
Vishay Foil Resistors
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y16071R50000D9W (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
CHARACTERISTICS
(1)
0
= standard part, tin/lead termination
9
= standard part, lead (Pb)-free termination
129
= standard part, gold plated
Other
= custom
Y
1
6
0
7
1
R
PRODUCT CODE
1607
= VCS1625Z
RESISTANCE TOLERANCE
E
= ± 0.2 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1607 1R50000 D 9 W:
TYPE: VCS1625Z
VALUE: 1.5
ABSOLUTE TOLERANCE: ± 0.5 %
TERMINATION: lead (Pb)-free
PACKAGING: waffle pack
HISTORICAL PART NUMBER: VCS1625Z 1R5000 TCR0.2 D S W (will continue to be used)
VCS1625Z
MODEL
VCS1625Z
1R5000
OHMIC VALUE
1.5
TCR0.2
TCR
D
Characteristic
IM
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Note
(1)
Application engineering release: for non-standard requests, please contact application engineering.
Document Number: 63094
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
PR
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5
0
0
0
0
D
9
W
PACKAGING
R
= tape and reel
W
= waffle pack
S
W
RESISTANCE
TOLERANCE
E
= ± 0.2 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
TERMINATION
PACKAGING
S
= lead (Pb)-free
B
= tin/lead
G
= gold plated
T
= tape and reel
W
= waffle pack
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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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