VCS1625ZP (Z-Foil)
Vishay Foil Resistors
Ultra High Precision Z-Foil Surface Mount Current Sensing Chip Resistor
with Power Rating to 1 W and Temperature Coefficient of Resistance of
:
± 0.05 ppm/°C and Power Coefficient of 5 ppm at Rated Power
NEW
INTRODUCTION
The Z-foil technology provides a significant increase of
stability of resistance value’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 VPG’s revolutionary Z-foil technology.
Model VCS1625ZP is a surface mount chip resistor designed
with 4 pads for Kelvin connection. Utilizing VPG’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 typical 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.
The four terminal device separates the current leads from the
voltage sensing leads. This configuration eliminates the
effect of the lead wire resistance from points A to B and C to
D, allowing low TCR current sensing.
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)
Vishay Foil Resistors are not restricted to standard values,
we can supply specific “as required” values at no extra cost
or delivery (e.g. 1.234
vs. 1
)
Resistance Tolerance: to ± 0.2% (0.05% and 0.1% are
also available)
Power coefficient “R due to self heating”: 5 ppm at rated
power
Load life stability: 0.015 % at 70 °C, 2000 h at rated power
Electrostatic discharge (ESD) at least to 25 000 V
Short time overload < 0.005 %
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Power rating: 1 W at + 70 °C (figure 1)
Non inductive, non capacitive design
Rise time: 1 ns effectively no ringing
Current rating: 1.8 A maximum
Current noise: 0.010 µV
RMS
/V of applied voltage(< - 40 dB)
Voltage coefficient: < 0.1 ppm/V
Non inductive: < 0.08 µH
Non hot spot design
Prototype quantities available in just 5 working days or
sooner.
For higher temperature application above +150 °C and for
better performances please contact us.
FEATURES
FIGURE 1 - POWER DERATING CURVE
Percent of Rated Power
- 55 °C
100
75
50
25
0
- 75
TERMINATIONS
Two lead (Pb)-free options are available:
gold plated or tin plated
Tin/lead plated
B
I
A
R
C
I
D
+ 70 °C
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Z
in
~
∞
=
MAXIMUM
CURRENT
(2)
1.8 A
V
TABLE 1 - SPECIFICATIONS
(1)
MODEL
NUMBER
VCS1625ZP
(1)
RESISTANCE
RANGE
> 2.0
to 10
0.3
to 2.0
RESISTANCE
TOLERANCE
(4)
± 0.2 %, ± 0.5 %; ± 1.0 %
± 0.5 %; ± 1.0 %
TYPICAL TCR and MAX. SPREAD
(- 55 °C to + 125 °C, + 25 °C Ref)
± 0.2 ± 2.8 ppm/°C
POWER RATING
at + 70 °C
(2)
1 W on FR4 PCB
(3)
Notes
Tighter performances are available. Please contact application engineering foil@vishaypg.com
(2)
Whichever is lower
(3)
See solder pad layout at figure 2
(4)
0.05% and 0.1% are also available per special request
* Pb containing materials are not RoHS compliant, exemptions may apply
Document Number: 63155
Revision: 24-Jan-13
For any questions, contact:
foil@vishaypg.com
www.vishayfoilresistors.com
1
VCS1625ZP (Z-Foil)
Vishay Foil Resistors
FIGURE 2 - DIMENSIONS
in Inches (Millimeters)
Solder Pad Layout
2 oz. Copper (70 Microns)
Coated by Solder mask
L
W
0.806 (20.47)
0.020 (0.51)
Mounting
Pads (4)
I1
0.070 (1.78)
A
Electrical
Schematic
0.806 (20.47)
0.020 (0.51)
H
I2
E2
0.200 (5.08)
E1
B
I
1
R
I
2
E
1
Top View
Bottom View
Solder Coated Pads
(Windows in Solder Mask)
0.070 (1.78)
0.260 (6.60)
E
2
INCHES
L
H
W
A
B
MILLIMETERS
6.35 ± 0.25
4.06 ± 0.25
1.02 maximum
2.03 ± 0.13
1.02 ± 0.25
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)*
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
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 Opposing
Current in
Adjacent Lines
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
Note:
Foil shown in black, etched spaces in white
* To acquire a precision resistance value, the Bulk Metal Foil chip is trimmed by
selectively removing built-in “shorting bars.” To increase the resistance in known
increments, marked areas are cut, producing progressively smaller increases in
resistance. This method eliminates the effect of “hot spot” and improves the long term
stability of the hybrid chips.
Ambient Temperature (°C)
TABLE 2 - PERFORMANCE SPECIFICATIONS
TEST
Thermal shock 5 x (- 65 °C to + 150 °C)
Low temperature operation, - 65 °C, 45 min at P
nom
Short time overload, 6.25 x rated power, 5 s
High temperature exposure, + 150 °C, 100 h
Resistance to soldering heat
Moisture resistance
Load life stability 2000 h at 70 °C at 1 W
Note
(1)
Measurement error 0.001R
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2
For any questions, contact:
foil@vishaypg.com
Document Number: 63155
Revision: 24-Jan-13
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)
± 0.015 % (150 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)
± 0.025 % (250 ppm)
VCS1625ZP (Z-Foil)
Vishay Foil Resistors
FIGURE 5 - LOAD LIFE TEST
Load Life Test for 2000 Hr @ 1W, +70°C
Average of n=14 resistors per each value
200
150
100
ΔR (ppm)
50
0
–50
2R
0
200 400 600 800 1000 1200 1400 1600 1800 2000
–100
–150
–200
Time (hrs)
POST MANUFACTURING OPERATIONS (PMO)
Military applications can include requirements for
performance under conditions of stress beyond the normal
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 (PMO). The PMO
operations that will be discussed are only applicable to Foil
resistors. They stabilize Foil resistors while they are harmful
to other types. Short time overload, accelerated load life, and
temperature cycling are the three PMO exercises that do the
most to remove the anomalies down the road. Foil resistors
are inherently stable as manufactured. These PMO
exercises are only of value on foil resistors and they improve
the performance by small but significant amounts. Users are
encouraged to contact VPG's Foil applications engineering
for assistance in choosing the PMO operations that are right
for their application.
FIGURE 6 - COMPARISON OF CURRENT SENSE RESISTORS IN SOLAR PANEL
(PRODUCT DEMO)
This video compares the variations in output current of a
scaled-down model of a solar panel being monitored by three
different current sense resistor technologies as the resistors are
heated. All three output signals are displayed together for direct
comparison. The next-generation VFR foil resistor is compared
to thick film and metal band current sense resistors, all in
4-terminal Kelvin configurations. Each technology has distinctly
different patterns of response to the heat source, with the foil
having virtually no change and continuing a precise reading of
the output current regardless of the heat applied.
Document Number: 63155
Revision: 24-Jan-13
For any questions, contact:
foil@vishaypg.com
www.vishayfoilresistors.com
3
VCS1625ZP (Z-Foil)
Vishay Foil Resistors
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y16061R50000D9W (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
6
1
R
5
0
0
0
0
D
9
W
PRODUCT CODE
1606
= VCS1625ZP
RESISTANCE TOLERANCE
A
= ± 0.05 %
B
= ± 0.1 %
E
= ± 0.2 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
PACKAGING
R
= tape and reel
W
= waffle pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1606 1R50000 D 9 W:
TYPE: VCS1625ZP
VALUE: 1.5
ABSOLUTE TOLERANCE: ± 0.5 %
TERMINATION: lead (Pb)-free
PACKAGING: waffle pack
HISTORICAL PART NUMBER: VCS1625ZP 1R5000 TCR0.2 D S W (will continue to be used)
VCS1625ZP
MODEL
VCS1625ZP
1R5000
OHMIC VALUE
1.5
TCR0.2
TCR
Characteristic
D
RESISTANCE
TOLERANCE
A
= ± 0.05 %
B
= ± 0.1 %
E
= ± 0.2 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
S
TERMINATION
S
= lead (Pb)-free
B
= tin/lead
G
= gold plated
W
PACKAGING
T
= tape and reel
W
= waffle pack
Note
(1)
Application engineering release: for non-standard requests, please contact application engineering.
www.vishayfoilresistors.com
4
For any questions, contact:
foil@vishaypg.com
Document Number: 63155
Revision: 24-Jan-13
Legal Disclaimer Notice
Vishay Precision Group, Inc.
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, “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.
VPG 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, VPG 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 VPG’s knowledge of typical requirements that are often placed on VPG 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. You should ensure you have the current version of the relevant information by contacting
VPG prior to performing installation or use of the product, such as on our website at vpgsensors.com.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any
conduct of VPG.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
expressly indicated. Customers using or selling VPG products not expressly indicated for use in such applications do
so entirely at their own risk and agree to fully indemnify VPG for any damages arising or resulting from such use or sale.
Please contact authorized VPG 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.
Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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