300144, 300145
Vishay Foil Resistors
Bulk Metal
®
Foil Technology High Precision Voltage Divider
Resistors with TCR Tracking to 0.5 ppm/°C and
Tolerance Match to 0.005 % (50 ppm)
FEATURES
•
Temperature coefficient of resistance (TCR)
absolute: ± 2 ppm/°C typical
(- 55 °C to + 125 °C, + 25 °C ref.)
TCR tracking: 0.5 ppm/°C
•
Tolerance: absolute and matching to 0.005 %
(50 ppm)
•
Power rating: 0.2 W at 70 °C, for the entire resistive
element R
1
and R
2
, divided proportionally between the two
values
•
Load life ratio stability: < 0.005 % (50 ppm) 0.2 W at 70 °C
for 2000 h
•
Maximum working voltage: 200 V
•
Resistance range: 100R to 20K per resistive element
•
Vishay Foil resistors are not restricted to standard
values/ratios; specific “as requested” values/ratios can be
supplied at no extra cost or delivery (e.g. 1K2345 vs. 1K)
•
Electrostatic discharge (ESD) up to 25 000 V
•
Non-inductive, non-capacitive design
•
Rise time: 1 ns effectively no ringing
•
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
•
Current noise: 0.010 µV
RMS
/V of applied voltage (< - 40 dB)
•
Thermal EMF: 0.05 µV/°C typical
•
Voltage coefficient: < 0.1 ppm/V
•
Non inductive: < 0.08 µH
•
Non hot spot design
•
Terminal finish: lead (Pb)-free or tin/lead alloy
•
Compliant to RoHS directive 2002/95/EC
•
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
•
For better performances see 300144Z, 300145Z (Z-Foil)
datasheet
INTRODUCTION
Why tight tolerance is important?
Why do users employ tight tolerance resistors? A system or
a device or one particular circuit element must perform for a
specified period of time and at the end of that service period
it must still be performing within specifications.
During its useful life it may have been subjected to some
hostile service conditions and it is no longer within purchased
tolerance.
What is ratio?
The ratio tolerances available in a divider are variable and
dependent on resistor technology. Bulk Metal
®
foil provides
the tightest ratio tolerance available.
The tight resolution capability and overall stability of foil
resistors permit adjustment within the divider to ratio not
available with other technologies. Ratios in network form, in
a common package have a better chance of holding tight
tolerances than those formed in a discrete matched set by
sorting.
Molded foil 300144, 300145 resistors can be provided in a
tolerance as tight as 0.005 %. Theoretically, ratios such as
these can be made initially with other resistor technologies.
However, less stable products will not hold these tight ratios
tolerances over time and applied stresses like voltage and
temperature.
Vishay Bulk Metal foil dividers/networks 300144, 300145
hold their ratio tolerances under defined circumstances.
Networks with tight ratio tolerances and controlled tracking
extend the useful life of equipment, whether expressed as
mean-time-between-failures (MTBF) or service periods to
recalibration or end-of-life-cycle.
How to avoid thermal EMF?
When the resistor’s terminals and the resistive element are
made of dissimilar metals and two junctions are at a different
temperature, a voltage is produced which is called “thermal
EMF”.
The level of voltage output is a function of the metals
involved and the differential temperature. The voltage
produced is either positive or negative depending on which
junction is considered as a reference point. Virtually all
resistive products have these metallic junctions. It is
presumed they will eventually be terminated to copper as a
final metallic combination and therefore copper is used as a
typical reference material.
300144, 300145 have the lowest thermal EMF’s because all
junctions have low microvolts outputs. Moreover,
construction of the resistive element is such that the input
and output junctions of the resistor are so close that the
temperature gradients between then is highly unlikely. These
design factors produce a divider with very low thermal EMF.
Our application engineering department is available to
advise and make recommendations. For non-standard
technical requirements and special applications. Please
contact us.
APPLICATIONS
•
•
•
•
•
•
•
•
Instrumentation amplifiers
Bridge networks
V
1
Differential amplifiers
V
2
Military
Space
Medical
Automatic test equipment
Down-hole (high temperature)
R
2
R
1
R
3
R
4
-
+
V
out
300144
300145
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63045
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
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behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
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purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group 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, Vishay Precision Group
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 Vishay Precision Group’s knowledge of typical requirements that are often placed on
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properties described in the product specification is suitable for use in a particular application.
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Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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