Ultra High Precision Vishay Foil Surface Mount Resistors
Military and Space Applications
Vishay Foil Resistors
Document Number: 63147
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
Revision: 06-May-10
1
INTRODUCTION
Many manufacturers and users of precision electronic
equipment suffer unnecessarily with unexplained instabilities
and drifts. They resign themselves to the need for constant
adjustments and troubleshooting which could in fact be
avoided.
Often the instability is traceable to a few “fixed” resistors
which are not fixed at all. If these resistors would only retain
their original values, there would be no need for costly
controls and other compensating circuitry.
The answer? A real precision and stable resistor.
Some precision resistors offer you tight tolerance at the
expense of poor load life stability (1000 h or more), thermal
stabilization and ESD sensitivity, others offer low TCR at the
expense of poor rise time.
Only Vishay Bulk Metal
®
Foil resistors offer you the complete
set of top performance characteristics, including TCR as low
as 0.2 ppm/°C with the Z-foil technology, a combination that
will most often free your equipment from that tormenting bug.
Vishay now offers you the chance to make your own custom
bulk-metal resistors for breadboard, prototype, or even
production use.
Call or write for information about our resistors:
foil@vishaypg.com
APPLICATIONS
Dc-to-dc converters, feedback circuits, precision amplifiers in
test and measurement instrumentation, medical systems,
satellites and aerospace systems, commercial and military
avionics, weapons systems, audio systems, and
high-temperature systems including down-hole drilling.
How to order:
foil@vishaypg.com
FEATURES
•
Temperature coefficient of resistance (TCR) from
0.2 ppm/°C (military range) with the Z-foil technology
•
Load life stability: to 0.005 % at + 70 °C, at rated power for
more than 10 000 h
•
Tolerance: best to 0.01 %
•
Power coefficient (
Δ
R due to self heating): to 5 ppm at
rated power for Z-foil resistors
•
Resistance range: from 2 m
Ω
•
Vishay Foil resistors are not restricted to standard values,
we can supply specific “as required” values at no extra cost
or delivery (e.g. 1K2345 vs. 1K)
•
Electrostatic discharge (ESD) immunity up to 25 000 V
•
Fast terminal stabilization < 1 s
•
Rise time: 1 ns effectively no ringing
•
Thermal EMF < 0.1 µV/°C (Seebeck effect), especially
critical for low resistive value in DC current/voltage
•
Special non inductive and non capacitive design
•
The short time overload test is also part of the standard
production process (100 %)
•
Vishay Foil resistors have been radiation tested
•
There are four main factors which should be considered
when designing a board: TCR, PCR, thermal EMF and
ESD. Vishay Foil resistors provide the best combination of
the above factors
•
Data package and test results are available, please
contact us (
foil@vishaypg.com
)
ABOUT THE VISHAY BULK METAL FOIL
RESISTOR
Vishay low cost high precision Bulk Metal Foil resistors are
the result of an improved concept in resistor manufacturing:
a proprietary Bulk Metal Foil of known and controllable
properties is applied to a special ceramic substrate.
A resistive pattern is then photo-etched by an ultra-fine
technique developed by Vishay. This process results in
resistor element characteristics of low TCR, long term
stability, non inductive, excellent thermal stabilization, low
capacitance and low noise.
The Bulk Metal Foil is a special alloy chosen for its electrical
mechanical and thermal characteristics. It is set on the
substrate by a unique and proprietary process which does
not subject the resistor element to the metallurgical changes
that occur during the winding of wire, or during the
evaporative process used in other forms of resistor
manufacturing. Because the alloy in the Vishay resistor is not
drawn, wound, work hardened, or stressed in any way during
manufacturing process, the resistor maintains all of its