High Precision Bulk Metal® Foil Surface Mount Current
Sensing Chip Resistor with TCR of ± 2 ppm/°C and
Load Life Stability of ± 0.02 %
VCS1625
Vishay Foil Resistors
Document Number: 63023 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 23-Mar-10 1
INTRODUCTION
Model VCS1625 is a surface mount resistor designed with
4 pads for Kelvin connection. Utilizing Vishay Bulk Metal®
foil as the resistance element, it provides performance
capabilities far greater than other resistor technologies can
supply in a product of comparable size.
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. Gold terminations are
available on special order.
Our application engineering department is available to
advise and to make recommendations. For non standard
technical requirements and special applications, please
contact us.
Note
(1) Power rating at + 70 °C: 0.5 W on FR4 PCB
FEATURES
•Temperature coefficient of resistance (TCR):
± 2.0 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.) (see table 1)
•Resistance range: 0.01 Ω to 10 Ω (for higher or
lower values please contact us)
•Vishay Foil resistors are not restricted to
standard values, we can supply specific “as required”
values at no extra cost or delivery (e.g. 1.2345 Ω vs. 1 Ω)
•Tolerance: to ± 0.1 %
•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 %
•Non inductive, non capacitive design
•Power rating: 0.5 W at + 70 °C (figure 1) or 5 A, whichever
is lower
•Thermal EMF: 0.05 µV/°C typical
•Non hot spot design
•Current noise: < - 40 dB
•Rise time: 1 ns effectively no ringing
•Voltage coefficient: < 0.1 ppm/V
•Non inductive: < 0.08 µH
•For better performances please review VCS1625Z (Z-foil)
datasheet
TERMINATIONS
•Two lead (Pb)-free options are available:
gold plated or tin plated
•Tin/lead plated
APPLICATIONS
•Automatic test equipment (ATE)
•Airborne (in heads-up display systems)
•High precision instrumentation
•Electron beam recording equipment
•Electron microscopes
•Current sensing applications
•Forced balance electronic scales
•Applications that require superior frequency stability
•Military
•Medical
* Pb containing materials are not RoHS compliant, exemptions may apply
FIGURE 1 - POWER DERATING CURVE (1)
100
75
50
25
0
- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Percent of Rated Power
+ 70 °C
- 55 °C
I1E1
I2E2
Electrical
Schematic
R
TABLE 1 - TOLERANCE AND TCR VS. RESISTANCE VALUE (- 55 °C to + 125 °C, + 25° Ref.)
VALUE (Ω) TOLERANCE TYPICAL TCR MAXIMUM TCR
> 2R000 to 10R000 0.2 %, 0.5 %, 1 % ± 2 ppm/°C ± 5 ppm/°C
> 0R500 to 2R000 0.5 %, 1 % ± 2 ppm/°C ± 10 ppm/°C
> 0R100 to 0R500 1 % ± 2 ppm/°C ± 15 ppm/°C
> 0R050 to 0R100 1 % ± 2 ppm/°C ± 20 ppm/°C
> 0R030 to 0R050 1 % ± 2 ppm/°C ± 30 ppm/°C
> 0R010 to 0R030 1 % ± 2 ppm/°C ± 50 ppm/°C
VCS1625
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63023
2Revision: 23-Mar-10
Note
• Measurement error 0.001R
FIGURE 2 - DIMENSIONS in Inches (Millimeters)
INCHES MILLIMETERS
L 0.250 ± 0.010 6.35 ± 0.25
H 0.160 ± 0.010 4.06 ± 0.25
W 0.040 maximum 1.02 maximum
A 0.080 ± 0.005 2.03 ± 0.13
B 0.040 ± 0.010 1.02 ± 0.25
L
H
WA
B
I2
I1E1
E2
Solder Pad Layout
Top View Bottom View
Mounting
Pads (4)
0.200
0.260
(6.60)
(5.08)
0.070
(1.78)
0.070
(1.78)
FIGURE 1 - TRIMMING TO VALUES
(Conceptual Illustration)
Mutual Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Note: Foil shown in black, etched spaces in white
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 4 - TYPICAL TCR CURVE
+ 75
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
Ambient Temperature (°C)
∆R
R
(ppm)
± 2 ppm/°C (+ 25 °C reference)
+ 100 + 125- 25 0+ 25
+ 50- 50
TABLE 2 - PERFORMANCE SPECIFICATIONS
TEST MIL-PRF-55342
ΔR LIMITS
TYPICAL
ΔR LIMITS
MAXIMUM
ΔR LIMITS
Thermal Shock 5 x (- 65 °C to + 150 °C) ± 0.10 % ± 0.005 % (50 ppm) ± 0.01 % (100 ppm)
Low Temperature Operation ± 0.10 % ± 0.005 % (50 ppm) ± 0.01 % (100 ppm)
Short Time Overload ± 0.10 % ± 0.005 % (50 ppm) ± 0.02 % (200 ppm)
High Temperature Exposure ± 0.10 % ± 0.01 % (100 ppm) ± 0.02 % (200 ppm)
Resistance to Soldering Heat ± 0.2 % ± 0.01 % (100 ppm) ± 0.03 % (300 ppm)
Moisture Resistance ± 0.20 % ± 0.01 % (100 ppm) ± 0.03 % (300 ppm)
Load Life 2000 h at 70 °C: Rated Power On Ceramic PCB ± 0.5 % ± 0.02 % (200 ppm) ± 0.04 % (400 ppm)
VCS1625
Vishay Foil Resistors
Document Number: 63023 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 23-Mar-10 3
Note
(1) For non-standard requests or additional values, please contact application engineering.
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y08501R50500D9L (preferred part number format)
DENOTES PRECISION VALUE AER (1)
YR = Ω0 = standard part, tin/lead termination
9 = standard part, lead (Pb)-free termination
129 = gold plated
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
0850 = VCS1625 B= ± 0.1 %
E= ± 0.2 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
K= ± 10.0 %
W= waffle pack
R= tape and reel
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0850 1R50500 D 9 W:
TYPE: VCS1625
VALUES: 1.505 Ω
ABSOLUTE TOLERANCE: ± 0.5 %
TERMINATION: tin plated (lead (Pb)-free)
PACKAGING: bulk pack
HISTORICAL PART NUMBER: VCS1625 1R5050 TCR2 D S W (will continue to be used)
VCS1625 1R50500 TCR2 D S W
MODEL OHMIC VALUE
TEMPERATURE
COEFFICIENT
CHARACTERISTIC
RESISTANCE
TOLERANCE TERMINATION PACKAGING
VCS1625 1.505 ΩB= ± 0.1 %
E= ± 0.2 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
K= ± 10.0 %
S= lead (Pb)-free
B= tin/lead
G= gold plated
W= waffle pack
T= tape and reel
8501 505RY0 090 WD
Document Number: 63999 www.vishaypg.com
Revision: 22-Feb-10 1
Disclaimer
Legal Disclaimer Notice
Vishay Precision Group
1
All 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.
Vishay Precision Group 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 Precision Group’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 Precision Group.
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 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.
