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
I
1
E
1
I
2
E
2
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
