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
VCS1625Z (Z-Foil)
Vishay Foil Resistors
Document Number: 63094 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 23-Mar-10 1
IMPROVED PRODUCT
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.
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
TERMINATIONS
Two lead (Pb)-free options are available:
gold plated or tin plated
Tin/lead plated
APPLICATIONS
Military
Medical
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
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
FIGURE 1 - POWER DERATING CURVE
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
I1E1E2I2
R
V
I
I
TABLE 1 - SPECIFICATIONS (2)
MODEL
NUMBER
RESISTANCE
RANGE
RESISTANCE
TOLERANCE
TYPICAL TCR and MAX. SPREAD
(- 55 °C to + 125 °C, + 25 °C)
POWER RATING
at + 70 °C (1)
MAXIMUM
CURRENT (1)
VCS1625Z > 2.0 to 10
0.3 to 2.0
± 0.2 %, ± 0.5 %; ± 1.0 %
± 0.5 %; ± 1.0 % ± 0.2 ± 2.8 ppm/°C 0.5 W on FR4 PCB 5 A
VCS1625Z (Z-Foil)
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63094
2Revision: 23-Mar-10
IMPROVED PRODUCT
Note
(1) 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
Solder Pad Layout
0.200
0.260
(6.60)
(5.08)
0.070
(1.78)
0.070
(1.78)
L
H
WA
B
I2
I1E1
E2
Top View Bottom View
Mounting
Pads (4) I1E1
I2E2
Electrical
Schematic
R
FIGURE 3 - 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 Z-FOIL
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
- 55 - 25 + 25 + 60 + 75 + 100 + 125
Ambient Temperature (°C)
ΔR
R
(ppm)
0
0.05 ppm/°C
- 0.1 ppm/°C 0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
- 0.16 ppm/°C
- 400
+ 300
+ 400
TABLE 2 - PERFORMANCE SPECIFICATIONS
TEST MIL-PRF-55342
R LIMITS
TYPICAL
R LIMITS
MAXIMUM
R LIMITS (1)
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 ± 0.2 % ± 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)
VCS1625Z (Z-Foil)
Vishay Foil Resistors
Document Number: 63094 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 23-Mar-10 3
IMPROVED PRODUCT
Note
(1) Application engineering release: for non-standard requests, please contact application engineering.
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y16071R50000D9W (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS (1)
YR = 0 = standard part, tin/lead termination
9 = standard part, lead (Pb)-free termination
129 = standard part, gold plated
Other = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
1607 = VCS1625Z E= ± 0.2 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
R= tape and reel
W= waffle pack
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 1R5000 TCR0.2 D S W
MODEL OHMIC VALUE TCR RESISTANCE
TOLERANCE TERMINATION PACKAGING
VCS1625Z 1.5 Characteristic E= ± 0.2 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
S= lead (Pb)-free
B= tin/lead
G= gold plated
T= tape and reel
W= waffle pack
6071 500RY1 D90 W0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11
