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
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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
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
