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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

Document Number: 63138 For any questions, contact: foil@vishay.com
www.vishay.com
Revision: 03-Nov-08 1
RS92N, RS92NA, AN
Vishay Foil Resistors
High Precision Foil Resistor with TCR of
± 2.0 ppm/°C
,
Tolerance of
± 0.01 %
and Load Life Stability
of
± 0.005 %
CECC Qualified
INTRODUCTION
Bulk Metal
®
Foil (BMF) technology outperforms all other
resistor technologies available today for applications that
require high precision and high stability.
This technology has been pioneered and developed by
VISHAY, and products based on this technology are the
most suitable for a wide range of applications. BMF
technology allows us to produce customer orientated
products, designed to satisfy challenging and specific
technical requirements.
Models RS92N, RS92NA, and AN made from Vishay BMF
offers low TCR, excellent load life stability, tight tolerance,
fast response time, low current noise, low thermal EMF and
low voltage coefficient, all in one resistor.
The RS92N, RS92NA, and AN are virtually insensitive to
destabillizing factors. The resistor element is a solid alloy
that displays the desirable bulk properties of its parent
material, thus it is inherently stable and noise free.
Vishay’s Bulk Metal
®
RS92N, RS92NA, and AN resistors are
the modern generation of precision resistors. The standard
design of these resistors provides a unique combination of
characteristics found in no other single resistor.
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):
± 2 ppm/°C typical (- 55 °C to + 155 °C, ref. + 20 °C)
Rated power: to 0.25 W at + 125 °C
Tolerance: ± 0.01 %
Load life stability: to ± 0.005 % at 70 °C, 2000 h at rated
power
Resistance range: 80.6 Ω to 120 kΩ (higher or lower
values of resistance are available)
Electrostatic discharge up to 25 000 V
Non inductive, non capacitive design
Rise time: 1 ns effectively no ringing
Current noise: < - 40 dB
Thermal EMF: 0.05 µV/°C typical
Voltage coefficient: < 0.1 ppm/V
Low inductance: < 0.08 µH typical
Non hot spot design
Terminal finishes available: tin/lead alloy
Matched sets are available per request
(TCR Tracking: to 0.5 ppm/°C)
For better TCR and PCR performances please review the
RNC90Z
and Z555 datasheets
APPLICATIONS
High precision amplifiers
Down-hole (high temperature)
High precision instrumentation
Medical and test equipment
Industrial
Audio (high end stereo equipment)
EB applications (electron beam scanning and recording
equipment, electron microscopes)
Military, airborne
Measurement instrumentation
TABLE 1 - TOLERANCE AND TCR VS.
RESISTANCE VALUE
(- 55 °C to + 155 °C, + 20 °C Ref.)
RESISTANCE
VALUE
(Ω)
TOLERANCE
(%)
TYPICAL TCR AND
MAX. SPREAD
(ppm/°C)
80.6 to 120K ± 0.01 ± 2 ± 3
TABLE 2 - MECHANICAL AND ENVIRONMENTAL SPECIFICATIONS
Mechanical Protection Insulated case
Resistive Element Nickel-chromium
Unit Weight 0.3 g
Temperature Limits - 55 °C to + 155 °C
Climatic Category 55/155/56
RS92N, RS92NA, AN
Vishay Foil Resistors
High Precision Foil Resistor with TCR of ± 2.0 ppm/°C,
Tolerance of ± 0.01 % and Load Life Stability
of ± 0.005 % CECC Qualified
www.vishay.com For any questions, contact: foil@vishay.com Document Number: 63138
2 Revision: 03-Nov-08
TABLE 3 - ELECTRICAL SPECIFICATIONS
Qualified Ohmic Range
RS92N, RS92NA 80R6 to 120K
AN 80R6 to 92K
Qualified Tolerances
0.01 % to 1 %
Power Rating
0.5 W at +70 °C
0.25 W at + 125 °C
Temperature Coefficient see diagram
Dielectric Strength
700 V
AC
Insulation Resistance > 10
4
MΩ
Thermal EMF < 0.5 µV for 1 °C of difference between leads
Noise non measureable
Thermal Resistance
0.14 °C/mW
TABLE 4 - PERFORMANCE
TESTS CONDITIONS
REQUIREMENTS
C 83-220
CECC 40302-001
TYPICAL DRIFTS
Overload
2.5 U
n
/5 s
U
max.
< 2 U
n
± 0.01 % ± 0.002 %
Temperature Cycling
- 55 °C to + 155 °C, 5 cycles
CEI 68-2-14 test Na
± 0.01 % ± 0.003 %
Terminals Strength
CEI 68-2-21
test Ua (pulling), Ub (bending),
Uc (twisting)
± 0.01 % ± 0.002 %
Resistance to Soldering Heat
260 °C/10 s
CEI 68-2-20A test Tb (method 1A)
± 0.01 % ± 0.002 %
Vibrations
10 Hz to 500 Hz
0.75 mm or 10g for 6 h method B4
CEI 68-2-6 test Fc
± 0.01 % ± 0.002 %
Climatic Sequence
- 55 °C to + 155 °C, 6 cycles,
95 % R.H., 85 mbar
CEI 68-1
± 0.05 %
Insulation R > 10
2
MΩ
± 0.003 %
Insulation R > 10
4
MΩ
Humidity (Steady State)
56 days, 95 % R.H., 40 °C
CEI 68-2-3
± 0.05 %
Insulation R > 10
2
MΩ
± 0.003 %
Insulation R > 10
4
MΩ
Load Life
1000 h Pr at + 70 °C
90’/30’ cycle
± 0.05 % ± 0.01 %
High Temperature Exposure
1000 h/155 °C
CEI 68-2-20A test B
± 0.05 % ± 0.01 %
Document Number: 63138 For any questions, contact: foil@vishay.com
www.vishay.com
Revision: 03-Nov-08 3
RS92N, RS92NA, AN
High Precision Foil Resistor with TCR of ± 2.0 ppm/°C,
Tolerance of ± 0.01 % and Load Life Stability
of ± 0.005 % CECC Qualified
Vishay Foil Resistors
FIGURE 1 - STANDARD IMPRINTING AND DIMENSIONS
Note
1. The standoffs shall be so located as to give a lead clearance of 0.010" minimum between the resistor body and the printed circuit board
when the standoffs are seated on the printed circuit board. This is to allow for proper cleaning of flux and other contaminants from the unit
after all soldering processes.
MODEL DIM. LS W L H ST LL
WEIGHT
NOMINAL
RS92NA mm 3.81 ± 0.13 2.50 max. 7.50 max. 8.00 max. 0.254 min. 25.4 min. 0.6 g
RS92N mm 5.08 ± 0.076 2.50 max. 7.50 max. 8.00 max. 0.254 min. 25.4 min. 0.6 g
AN mm 5.08 ± 0.076 2.50 max. 7.50 max. 8.00 max. 0.254 min. 25.4 min. 0.6 g
FIGURE 2 - TRIMMING TO VALUES (Conceptual Illustration)
LS
Model Number
VISHAY
XXXX
RS92
ST
1)
H
L
Date Code
W
Front View Rear View
Lead Material #22 AWG
Round Solder Coated Copper
Optional Customer Part Number
Print specification, etc. if required
Resistance
Value Code
Tolerance
XXXXXX
100R01
0.01 %
LL
SW
10
Week
01
Year
Mutual Inductance
Reduction due
to Change in
Current Direction
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 3 - POWER RATING CHART
1.00
0.75
0.50
0.25
0
0 25 50 75 100 125 150 175
Rated Power (W)
Ambient Temperature (°C)
+ 70 °C + 155 °C
FIGURE 4 -FOIL RESISTOR TCR
IN MILITARY RANGE
- 50 - 25 0 + 25 + 50 + 75 + 100 + 125
- 55
C Alloy
2 ppm/°C
2 ppm/
°C
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
R
R
(ppm)
Temperature (°C)
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