VCS232Z (Z-Foil)
Vishay Foil Resistors
Ultra High Precision Z-Foil Power Current Sensing Resistor with
Absolute TCR of ± 0.05 ppm/°C, ESD Immunity up to 25 kV and
Tolerance of ± 0.02 %, Power Rating up to 2 W
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.)
Power coefficient “R due to self heating”:
4 ppm/W typical
Power rating at + 25 °C: 2 W (free air)
Tolerance: to ± 0.02 %
Load life stability: to ± 0.005 %, 25 °C for 2000 h at rated
power
Maximum current: 3 A
Resistance range: 0.25 to 500
Foil resistors are not restricted to standard values; specific
“as required” values can be supplied at no extra cost or
delivery (e.g 100.234
vs. 100)
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
Thermal stabilization time < 1 s
Current noise <- 40 dB
Thermal EMF: 0.05 µV/°C
Voltage coefficient < 0.1 ppm/V
Non inductive: 0.08 µH
Non hot spot design
Terminal finish: lead (Pb)-free or tin/lead alloy
Compliant to RoHS directive 2002/95/EC
For better performances please contact us
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
INTRODUCTION
IM
PR
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VE
D
TABLE 1 - TOLERANCE AND TCR
RESISTANCE
RANGE
()
0.25 to < 10
10 to 500
TIGHTEST
RESISTANCE
TOLERANCE
± 0.05 %
± 0.02 %
TYPICAL TCR AND
MAX. SPREAD
(ppm/°C)
(1)
± 0.2 ± 2.8
± 0.2 ± 1.8
Notes
(1)
- 55 °C to + 125 °C, + 25 °C ref.
• Contact applications engineering for other available values
Today, designers of analog circuits are demanding
discrete power current sense resistors that approach the
ideal in performance … stable, high speed, high accuracy
components that will operate with assured, predictable
reliability for years in a variety of environments. Foil is
meeting those demands with the VCS232Z of unequalled
performances.
These four fundamental factors determine how “ideal” a
precision power current sense resistor will be:
1. Initial resistance value or how closely the absolute
resistance value can be achieved
2. How precisely the value of individual resistors can be
controlled
3. How precisely the end of life tolerance is maintained
under a wide range of operating conditions and stress
factors (temperature, humidity, load, etc.)
4. Fast response without ringing and fast thermal
stabilization - and the ability of the resistor to react to
rapid switching without adversely affecting the circuit
function.
Until the development of Foil resistors, precise control of all
four factors was virtually impossible.
Foil VCS232Z resistor containing the latest version of Z-foil
achieves maximum stability, a near zero temperature
coefficient and the ability to remove errors due to
temperature gradients. This superior performance is built-in
for every unit and does not rely on culling or other artificial
means for uniform excellence.
FIGURE 1 - POWER DERATING CURVE
- 55 °C
+ 25 °C
+ 100
+ 75
+ 50
+ 25
Percent of
Rated Power
0
- 50
0
+ 50
+ 100
+ 150
+ 200
Ambient Temperature (°C)
(Further Derating Not Necessary)
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63095
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
PR
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CT
APPLICATIONS
Automatic test equipment (ATE)
High precision instrumentation
Electron beam application
Medical
Current sensing applications
Pulse applications
Military
Power amplifier
Power supplies
R
I
I
I
1
E
1
V
E
2
I
2
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VCS232Z (Z-Foil)
Vishay Foil Resistors
FIGURE 2 - TRIMMING TO VALUES
(conceptual illustration)
FIGURE 3 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
(for more details, see table 1)
+ 500
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
Mutual Inductance
Reduction due
to Change in
Current Direction
Note:
Foil shown in
black,
etched spaces in
white
FIGURE 4 - DIMENSIONS
in inches (millimeters)
L
D
2
IM
PR
O
VE
D
D
1
LS
LT
MODEL
L
MAX.
H
MAX.
W
MAX.
VCS232Z
1.240 (31.50)
0.512 (13.00)
0.177 (4.50)
0.500 (12.70)
TABLE 2 - VCS232Z PERFORMANCE SPECIFICATIONS
TEST
(Conditions per MIL-PRF-49465)
Thermal Shock
CONDITIONS
MIL-PRF-49465C
R
LIMITS
± (0.5 % + 0.0005R)
± (0.5 % + 0.0005R)
± (0.25 % + 0.0005R)
± (1.0 % + 0.0005R)
± (1.0 % + 0.0005R)
± (0.5 % + 0.0005R)
± (0.5 % + 0.0005R)
± (0.1 % + 0.0005R)
± (0.1 % + 0.0005R)
± (1.0 % + 0.0005R)
95 % coverage
TYPICAL
R
LIMITS
± 0.01 %
± 0.005 %
± 0.01 %
± 0.002 %
± 0.01 %
± 0.002 %
± 0.01 %
± 0.01 %
± 0.01 %
± 0.005 %
-
MAXIMUM
R
LIMITS
± 0.02 %
± 0.01 %
± 0.02 %
± 0.005 %
± 0.02 %
± 0.005 %
± 0.02 %
± 0.02 %
± 0.02 %
± 0.02 %
-
- 55 °C to + 125 °C, 5 cycles
5 x rated power for 5 s
Short Time Overload
Resistance to Soldering Heat
Terminal Strength
10 s to 12 s at + 260 °C
Pull test at 5 lb
High Temperature Exposure
Low Temperature Storage
Moisture Resistance
2000 h, + 150 °C
MIL-PRF-49465, 24 h at - 55 °C
MIL-STD-202, method 106, + 65 °C to - 10 °C,
90 % to 98 % RH, rated power, 240 h
100 g, 6 ms
(10 Hz to 2000 Hz) 20 g
2000 h, + 25 °C at rated power
MIL-STD-202
Shock (Specified Pulse)
Vibration (High Frequency)
Load Life Stability
Solderability
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For any questions, contact:
foil@vishaypg.com
PR
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CT
+ 400
+ 300
+ 200
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
- 400
- 0.16 ppm/°C
- 25
0
0.2 ppm/°C
- 500
- 55
+ 25
+ 60 + 75
+ 100 + 125
Ambient Temperature (°C) and TCR Chord Slopes for
Different Temperature Ranges
W
H
LL
Tin/Lead or Lead (Pb)-free
Solder coated
copper leads
LS
± 0.20 (± 0.5)
0.688 (17.48)
LT
± 0.20 (± 0.5)
1.083 (27.51)
D
1
NOM.
0.040 (1.02)
D
2
NOM.
0.032 (0.81)
LL
MIN.
Document Number: 63095
Revision: 23-Mar-10
VCS232Z (Z-Foil)
Vishay Foil Resistors
POST MANUFACTURING OPERATIONS OR PMO FOR IMPROVED EOL
Many analog applications can include requirements for
performance under conditions of stress beyond the norm and
over extended periods of time. This calls for more than just
selecting a standard device and applying it to a circuit. The
standard device may turn out to be all that is needed but an
analysis of the projected service conditions should be made
and it may well dictate a routine of stabilization known as
post manufacturing operations or PMO. The PMO operations
that will be discussed are only applicable to Bulk Metal Foil
resistors. They stabilize Bulk Metal Foil resistors while they
may be harmful to other types. Short time overload,
accelerated load life, and temperature cycling are the three
PMO methods that do the most to remove the anomalies
down the road. Bulk Metal Foil resistors are inherently stable
as manufactured. These PMO methods are only of value on
Bulk Metal Foil resistors and they improve the performance
by small but significant amounts. Users are encouraged to
contact Foil applications engineering for assistance in
choosing the PMO operations that are right for their
application.
TABLE 3 - GLOBAL PART NUMBER INFORMATION
(1)
DENOTES PRECISION
Y
VALUE
R
=
NEW GLOBAL PART NUMBER: Y160845R2361Q9L (preferred part number format)
Y
1
6
0
8
4
5
PRODUCT CODE
1608
= VCS232Z
RESISTANCE TOLERANCE
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
IM
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FOR EXAMPLE: ABOVE GLOBAL ORDER Y1608 45R2361 Q 9 L:
TYPE: VCS232Z
VALUES: 45.2361
ABSOLUTE TOLERANCE: ± 0.02 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
HISTORICAL PART NUMBER: VCS232ZT 45R2361 TCR0.2 Q B (will continue to be used)
VCS232Z
MODEL
T
45R2361
TCR0.2
TCR
CHARACTERISTIC
Q
ABSOLUTE
TOLERANCE
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
B
PACKAGING
B
= bulk
TERMINATION
OHMIC VALUE
45.2361
VCS232Z
T
= lead (Pb)-free
None = tin/lead
Note
(1)
For non-standard requests, please contact application engineering.
Document Number: 63095
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
PR
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CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
R
2
3
6
1
Q
9
L
PACKAGING
L
= bulk
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Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
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(collectively, “VPG”), 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 VPG’s terms and conditions of purchase, including but
not limited to, the warranty expressed therein.
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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