High Precision Foil Resistor with TCR of ± 2.0 ppm/°C,
Tolerance of ± 0.005 % and Load Life Stability of ± 0.005 %
RCK Series
Vishay Foil Resistors
Document Number: 63214 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jun-11 1
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 Foil Resistors (VFR), and products based on this
technology are the most suitable for a wide range of
applications. BMF technology allows the production of
customer-oriented products, designed to satisfy specific
challenging technical requirements.
The RCK series of BMF resistors 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 RCK series is 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. The standard design of
these resistors provides a unique combination of
characteristics found in no other single resistor.
VFR's application engineering department is available to
advise and to make recommendations. For non-standard
technical requirements and special applications, please
contact foil@vishaypg.com.
TABLE 1 - RESISTANCE VERSUS TCR
(- 55 °C to + 125 °C, + 25 °C ref.)
RESISTOR(1) RESISTANCE
VALUE (Ω)
TYPICAL TCR AND
MAX SPREAD
(ppm/°C)
RCK0X80 to < 1M ± 2 ± 2.5
RCK0X50 to < 80 ± 2 ± 3.5
RCK0X0.5 to < 50 ± 2 ± 4.5
(1) X refers to RCK Series model number - see Table 2
FEATURES
•
Temperature coefficient of resistance (TCR):
- 55 °C to + 125 °C, 25 °C ref.
- RCK0
X
series: ± 2 ppm/°C typical (see table 1)
•
Power rating: to 1 W at + 125 °C
•
Resistance tolerance: to ± 0.005 % (50 ppm)
•
Load life stability: ± 0.005 % at 70 °C, 2000 h at
rated power
•
Resistance range: 0.5
Ω
to 1 M
Ω
(for higher or lower
values, please contact Application Engineering)
•Vishay Foil resistors are not restricted to standard values;
specific “as required” values can be supplied at no extra
cost or delivery (e.g. 1K2345 vs. 1K)
•Electrostatic discharge (ESD) at least to 25 kV
•
Non inductive, non capacitive design
•Rise time: 1 ns effectively no ringing
•
Current noise: 0.010 µV
RMS
/V of applied voltage (< - 40 dB)
•
Thermal EMF: 0.05 µV/°C
•
Voltage coefficient: < 0.1 ppm/V
•
Low inductance: < 0.08 µH
•
Non hot-spot design
•Terminal finishes available: lead (Pb)-free, tin/lead alloy
•
Matched sets are available on request
(TCR tracking: to 0.5 ppm/°C)
•Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
•For better TCR performances please review the
datasheets for the Z Series and Z203
FIGURE 1 - TYPICAL RESISTANCE CHANGE
VERSUS TEMPERATURE CURVES AND
CHORD SLOPES (TCR) OF TWO ALLOYS
IN MILITARY RANGE
- 50 - 25 0 + 25 + 50 + 75 + 100 + 125
- 55
C Alloy
2 ppm/°C
–2 ppm/°C
+2 ppm/°C
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
ΔR
R
(ppm)
Temperature (°C)
* Pb containing terminations are not RoHS compliant, exemptions may apply
FIGURE 2 - STANDARD IMPRINTING AND DIMENSIONS
LS
Model Number
VFR
XXXX
RCK02
ST1)
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
(Pb - free coating available)
Note
1. Standoffs provided to allow proper flushing of flux, debris, and contaminates from under resistor after all solder operations.
2. 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.
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
RANGE
(Ω)
MAXIMUM
WORKING
VOLTAGE
AMBIENT
POWER RATING AVERAGE
WEIGHT IN
GRAMS
DIMENSIONS TIGHTEST
TOLERANCE
VS. LOWEST
RESISTANCE
VALUE
at
+ 70 °C
at
+ 125 °C INCHES mm
RCK02A
(RCK02) (1) 1 to 150K 300
0.6 W 0.3 W
0.6
W: 0.0984 max.
L: 0.300 ± 0.010
H: 0.326 ± 0.010
ST: 0.010 min.
SW: 0.040 ± 0.010
LL: 1.000 ± 0.125
LS: 0.150 ± 0.0054 (1)
2.5 max.
7.62 ± 0.25
8.28 ± 0.25
0.254 min.
1.02 ± 0.13
25.4 ± 3.18
3.81 ± 0.13
0.005 %/50 Ω
0.01 %/25 Ω
0.02 %/12 Ω
0.05 %/5 Ω
0.1 %/2 Ω
0.50 %/1 Ω
1 %/0.5 Ω
up to 100K
0.4 W 0.2 W
over 100K
RCK04 1 to 500K 350
1.0 W 0.5 W
1.4
W: 0.138 max.
L: 0.575 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.400 ± 0.020
3.50 max.
14.61 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
10.16 ± 0.51
up to 200K
0.6 W 0.3 W
over 200K
RCK05A 1 to 750K 350
1.5 W 0.75 W
1.9
W: 0.160 max.
L: 0.820 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.650 ± 0.020
4.06 max.
20.83 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
16.51 ± 0.51
up to 300K
0.8 W 0.4 W
over 300K
RCK05 1 to 750K 350
1.5 W 0.75 W
1.9
W: 0.138 max.
L: 0.890 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.7 ± 0.05
3.505 max.
22.606 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
17.78 ± 1.27
up to 300K
0.8 W 0.4 W
over 300K
RCK06 0.5 to 1M 500
2.0 W 1.0 W
4.0
W: 0.260 max.
L: 1.200 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.900 ± 0.020
6.60 max.
30.48 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
22.86 ± 0.51
up to 400K
1.0 W 0.5 W
over 400K
RCK Series
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63214
2Revision: 13-Jun-11
Notes
(1) For RCK02, L.S. = 5.08 mm (0.200 " inches).
FIGURE 3 - POWER DERATING CURVE
200 %
175 %
150 %
125 %
100 %
75 %
50 %
25 %
0 %
- 75
Ambient Temperature (°C)
Percent of Rated Power at + 125 °C
- 55 °C
Double Rated Power
Rated Power
2001751501251007550250- 25- 50
+ 70 °C
RCK Series
Vishay Foil Resistors
Document Number: 63214 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jun-11 3
FIGURE 4 - TRIMMING TO VALUES
(conceptual illustration)
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
TABLE 3 - ENVIRONMENTAL PERFORMANCE COMPARISON
MIL-PRF-55182
CHAR J
RCK-SERIES
MAXIMUM ΔR
RCK-SERIES
TYPICAL ΔR
Test Group I
Thermal shock, 5 x (- 65 °C to + 150 °C) ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Short time overload, 6.25 x rated power ± 0.2 % ± 0.01 % (100 ppm) ± 0.003 % (30 ppm)
Test Group II
Resistance temperature characteristics(1) ± 25 ppm/°C ± 6.5 ppm/°C ± 2.0 ppm/°C
Low temperature storage (24 h at - 65 °C) ± 0.15 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Low temperature operation
(45 min, rated power at - 65 °C) ± 0.15 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Terminal strength ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Test Group III
Dielectric Withstanding Voltage (DWV) ± 0.15 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Resistance to solder heat ± 0.1 % ± 0.01 % (100 ppm) ± 0.005 % (50 ppm)
Moisture resistance ± 0.4 % ± 0.05 % (500 ppm) ± 0.01 % (100 ppm)
Test Group IV
Shock ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Vibration ± 0.2 % ± 0.01 % (100 ppm) ± 0.002 % (20 ppm)
Test Group V
Life test at 0.3 W/+ 125 °C
2000 h ± 0.5 % ± 0.015 % (150 ppm) ± 0.01 % (100 ppm)
10 000 h ± 2.0 % ± 0.05 % (500 ppm) ± 0.03 % (300 ppm)
Test Group Va
Life test at 0.6 W (2 x rated power)/+ 70 °C, 2000 h ± 0.5 % ± 0.015 % (150 ppm) ± 0.01 % (100 ppm)
Test Group VI
High temperature exposure (2000 h at + 175 °C) ± 2.0 % ± 0.1 % (1000 ppm) ± 0.05 % (500 ppm)
Test Group VII
Voltage coefficient 5 ppm/V < 0.1 ppm/V < 0.1 ppm/V
(1) See Table 1.
FIGURE 5 - LONG-TERM STABILITY OVER 29 YEARS
(0.1W AT 70°C, 50 SAMPLES RCK02, 10KΩ)
ΔR/R (ppm)
Time (Years)
40
20
0
-20
-40
-60
-80
-100
-120
0 5 10 15 20 25 30
RCK Series
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63214
4Revision: 13-Jun-11
STANDARD OPERATIONS AND TEST
CONDITIONS
A. Standard Test Operations:
By 100 % Inspection
•Short-time overload (6.25 x rated power for 5 s)
•Resistance - tolerance check
•Visual and mechanical
By Sample Inspection
•TCR
•Environmental tests per table 3 on a quarterly basis to
establish performance by similarity
B. Standard Test Conditions:
•Lead test point: 0.5" (12.7 mm) from resistor body
•Temperature: + 23 °C ± 2 °C
•Relative humidity: per MIL-STD-202
IMPROVED PERFORMANCE TESTING (IPT)
The preceding information is based on product directly off
the production line. Improved performance (meaning
increased time stability with load and other stresses) is
available through factory conducted “Improved Performance
Testing”. The test routine is usually tailored to the user’s
stability objectives and IPT-processed resistors can exhibit
improved load-life stability levels of less than 50 ppm.
Various screen test routines are available and all anticipated
stresses must be taken into account before settling on one
specific test routine. VFR's application engineering
department is prepared to discuss and recommend
appropriate routines given the full spectrum of anticipated
stresses and stability requirements.
TABLE 4 - “RCK” SERIES SPECIFICATIONS
Stability (1)
Load life at 2000 h ± 0.015 % (150 ppm) Maximum ΔR at 0.3 W/+ 125 °C
± 0.005 % (50 ppm) Maximum ΔR at 0.1 W/+ 70 °C
Load life at 10 000 h ± 0.05 % (500 ppm) Maximum ΔR at 0.3 W/+ 125 °C
± 0.01 % (100 ppm) Maximum ΔR at 0.05 W/+ 125 °C
Current Noise 0.010 µV (RMS)/V of applied voltage (- 40 dB)
High Frequency Operation
Rise time 1.0 ns at 1 kΩ
Inductance (L) (2) 0.1 µH maximum; 0.08 µH typical
Capacitance (C) 1.0 pF maximum; 0.5 pF typical
Voltage Coefficient < 0.1 ppm/V (3)
Thermal Electromotive Force (EMF) (4) 0.1 µV/°C Maximum; 0.05 µV/°C typical
1 µV/W (Model RCK02)
Notes
(1) Load life ΔR maximum can be reduced by 80 %, please contact applications engineering department.
(2) Inductance (L) due mainly to the leads.
(3) The resolution limit of existing test equipment (within the measurement capability of the equipment, or “essentially zero”.)
(4) µV/°C relates to EMF due to lead temperature difference and µV/watt due to power applied to the resistor.
TABLE 5 - GLOBAL PART NUMBER INFORMATION (1)
NEW GLOBAL PART NUMBER: Y079380K5000V9L (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
Y R = Ω
K = kΩ
M = MΩ
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
0793 = RCK02
4793 = RCK02A
0771 = RCK04
0772 = RCK05
4772 = RCK05A
0773 = RCK06
V = ± 0.005 %
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
C = ± 0.25 %
D = ± 0.5 %
F = ± 1.0 %
L = bulk pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0793 80K5000 V 9 L:
TYPE: RCK02
VALUE: 80.5 kΩ
ABSOLUTE TOLERANCE: ± 0.005 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
HISTORICAL PART NUMBER: RCK02 T 80K500 V B (will continue to be used)
RCK02 T80K500 V B
MODEL TERMINATION RESISTANCE VALUE TOLERANCE PACKAGING
RCK02
RCK02A
RCK04
RCK05
RCK05A
RCK06
T = lead (Pb)-free
None = tin/lead alloy
250R00 = 250.00 Ω
5K2310 = 5.231 kΩ
1M000 = 1 MΩ
V = ± 0.005 %
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
C = ± 0.25 %
D = ± 0.5 %
F = ± 1.0 %
B = bulk pack
RCK Series
Vishay Foil Resistors
Document Number: 63214 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jun-11 5
Note
(1) For non-standard requests, please contact application engineering.
7938 K500Y0 V90 L0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
Legal Disclaimer Notice
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
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.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and conditions of
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
Vishay Precision Group products. It is the customer’s responsibility to validate that a particular product with the
properties described in the product specification is suitable for use in a particular application.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by
any conduct of Vishay Precision Group.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
expressly indicated. Customers using or selling Vishay Precision Group products not expressly indicated for use
in such applications do so entirely at their own risk and agree to fully indemnify Vishay Precision Group for any
damages arising or resulting from such use or sale. Please contact authorized Vishay Precision Group personnel
to obtain written terms and conditions regarding products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Legal Disclaimer Notice
Disclaimer
Document No.: 63999
Revision: 27-Apr-11
