Burden Resistor (Through-Hole Resistor
BurdenResistor(Through-HoleVersion)
Burden Version)
(Through-Hole Version)
High Precision Bulk Metal
®
Foil Burden Resistor
High Precision Bulk Metal® Foil Burden Resistor
FEATURES AND BENEFITS
•
Temperature coefficient of resistance (TCR):
—55°C to +125°C, 25°C ref.
• Burden (C): ±2 ppm/°C typical (Table 1)
• Burden (K): ±1 ppm/°C typical (Table 1)
• Burden (Z): ±0.2 ppm/°C typical (Table 2)
• Resistance tolerance: to ±0.005% (50 ppm)
• Load-life stability: ±0.005% after 2,000 hrs of 0.1 W at
70°C
• Power rating: to 0.6 W at +70°C
• Resistance range: 1 Ω to 500 Ω (for higher or lower
values, please contact us)
• VFR resistors are not restricted to standard values;
specific “as required” values can be supplied at no
extra cost or delivery (e.g., 80R0123 vs. 80
Ω)
•
Electrostatic discharge (ESD): at least to 25 kV
• Thermal stabilization time: <1 s (within 10 ppm of
steady state value)
• 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
• Low harmonic distortion, linear behavior
• Voltage coefficient: <0.1 ppm/V
• Low inductance: <0.08 μH
• Terminal finishes available: lead (Pb)-free, tin/lead alloy
•
For higher power and lower resistance values,
please check the VCSXXX Series:
http://www.vishaypg.com/doc?63240
Available from
our Express Hub
www.resistors4U.com
INTRODUCTION
The Vishay Foil Resistors (VFR) Burden resistor is usually
connected to the output of the power device for the
discharging of the bulk output filter capacitor when it is
charged and connected to a large power source, like an
accumulator or airplane battery. The Burden resistor offers
resistance of a few ohms and prevents the influence of
inrush current to the device that the power unit (power
converter) connects to. Inrush current usually happens
when the battery or accumulators are very large and their
capacity is too high. The Burden resistor is placed across
the output of the current transformer.
THE BURDEN RESISTOR
Current sensing transformers act as current sources and
need a load. A current source is the dual of a voltage
source, and just like you shouldn't short-circuit a voltage
source because it would cause infinite current, you
shouldn't leave a current source open, as it would cause
an infinite voltage. The precision Burden resistor converts
the current to a limited voltage. Typically it is used to
discharge a capacitor when the circuit isn't powered
anymore.
Figure 1—Nominal Resistance vs. Temperature Curves and Chord Slopes (TCR) of Foil Alloy
Types in Military Range
+150
+100
+50
±1 ppm/°C
±0.2 ppm/°C
K Alloy
1 ppm/ºC
Z Alloy
0.2 ppm/ºC
C Alloy
2 ppm/ºC
∆
R (ppm)
0
–50
–100
–150
–200
–50
–55
–2
0
+25
+50
+75
+100
R
±2 ppm/°C
+125
Note
* This datasheet provides information about parts that are RoHS-compliant and/or parts that are non-RoHS-compliant. For example,
parts with lead (Pb) terminations are not RoHS compliant. Please see the information/tables in this datasheet for details.
Document No.: 63258
Revision: 04-Dec-2014
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
Burden Resistor
BurdenResistor(Through-HoleVersion)
(Through-Hole Version)
Table 1—Typical TCR and Max. Spread
(–55°C to +125°C, +25°C Ref.)
Model
Number
Burden-K
80 to <500
Burden-C
Burden-K
50 to <80
Burden-C
Burden-K
1 to <50
Burden-C
±2 ±4.5
±2 ±3.5
±1 ±4.5
±2 ±2.5
±1 ±3.5
Burden-Z
Resistance
Value
(Ω)
Typical TCR and
Max. Spread
(ppm/°C)
±1 ±2.5
Table 2—Typical TCR and Max. Spread
(–55°C to +125°C, +25°C Ref.)
Model
Number
Resistance
Value
(Ω)
100 to 500
80 to <100
50 to <80
25 to <50
10 to <25
5 to <10
1 to <5
Typical TCR and
Max. Spread
(ppm/°C)
±0.2 ±0.6
±0.2 ±0.8
±0.2 ±1.0
±0.2 ±1.3
±0.2 ±1.6
±0.2 ±2.3
±0.2 ±3.2
Table 3—Model Selection
Model
Number
Resistance
Range
(Ω)
Ambient
Power Rating
at
+70°C
at
+125°C
Average
Weight
in
Grams
Dimensions
Inches
mm
Tightest
Tolerance
vs. Lowest
Resistance
Value
Burden-C
(Burden-J)
(1)
Burden-K
(Burden-L)
(1)
Burden-Z
(Burden-A)
(1)
(1)
1 to 500
0.6 W
0.3 W
0.6
W: 0.105 ±0.010
L: 0.300 ±0.010
H: 0.326 ±0.010
ST: 0.010 min.
SW: 0.040 ±0.005
LL: 1.000 ±0.125
LS: 0.150 ±0.005
2.67 ±0.25
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
0.200" (5.08 mm) lead spacing available—specify
Burden-J
for Burden-C,
Burden-L
for Burden-K, and
Burden-A
for Burden-Z.
Figure 3—Standard Imprinting and Dimensions
Front View
L
H
XXXX
Burden-X
ST
LS
VFR
Date Code
14
22
Year Week
(1)
Rear View
W
50R734
0.005%
SW
Lead Material #22 AWG
Round Solder Coated Copper
(Pb-free coating available)
LL
Resistance
Tolerance
Model Number X =
C (C-Foil Alloy)
K (K-Foil Alloy)
Z (Z-Foil Alloy)
Notes
(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.
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Document No.: 63258
Revision: 04-Dec-2014
BurdenResistor(Through-HoleVersion)
Burden Resistor
(Through-Hole Version)
Figure 2—Trimming to Values
(conceptual illustration)
Interloop
Capacitance
Reduction
in Series
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before Trimming
Current Path After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Note
To acquire a precision resistance value,
the Bulk Metal Foil chip is trimmed by
selectively removing built-in “shorting bars.”
To increase the resistance in known increments,
marked areas are cut, producing progressively
smaller increases in resistance. This method
reduces the effect of “hot spots” and improves
the long-term stability of VFR resistors.
Foil shown in black, etched spaces in white
Table 4—Environmental Performance
Group/Parameter
Test Group I
Thermal shock, 5 x (–65°C to +150°C)
Short time overload, 6.25 x rated power
Test Group II
Low temperature storage (24 h at –65°C)
Low temperature operation (45 min, rated power at –65°C)
Terminal strength
Test Group III
Dielectric Withstanding Voltage (DWV)
Resistance to solder heat
Moisture resistance
Test Group IV
Shock
Vibration
Test Group V
Life test at 0.3 W/+125°C
Test Group Va
Life test at 0.6 W/+70°C, 2000 h
Test Group VI
High temperature exposure (2000 h at +175°C)
Test Group VII
Voltage coefficient
2000 h
10 000 h
MIL-PRF-55182
CHAR J
±0.2%
±0.2%
±0.15%
±0.15%
±0.2%
±0.15%
±0.1%
±0.4%
±0.2%
±0.2%
±0.5%
±2.0%
±0.5%
±2.0%
5 ppm/V
Burden Resistor
Maximum ΔR
Typical ΔR
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.05% (500 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.015% (150 ppm)
±0.05% (500 ppm)
±0.015% (150 ppm)
±0.1% (1000 ppm)
<0.1 ppm/V
± 0.002 % (20 ppm)
± 0.003 % (30 ppm)
±0.002% (20 ppm)
±0.002% (20 ppm)
±0.002% (20 ppm)
±0.002% (20 ppm)
±0.005% (50 ppm)
±0.01% (100 ppm)
±0.002% (20 ppm)
±0.002% (20 ppm)
±0.01% (100 ppm)
±0.03% (300 ppm)
±0.01% (100 ppm)
±0.05% (500 ppm)
<0.1 ppm/V
Document No.: 63258
Revision: 04-Dec-2014
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
Burden Resistor
BurdenResistor(Through-HoleVersion)
(Through-Hole Version)
Figure 4—Part Number Information
GLOBAL PART NUMBER: Y202180R5000V9L
DENOTES PRECISION
Y
R
=
K
=k
M
=M
VALUE
0
= tin/lead
9
= lead (Pb)-free
1 to 999
= custom
TYPE
Y
2
0
2
1
8
0
Ω
5
0
0
0
V
9
L
Y2021
= Burden-C
Y2022
= Burden-J
Y2023
= Burden-K
Y2024
= Burden-L
Y2025
= Burden-Z
Y2026
= Burden-A
PRODUCT CODE
RESISTANCE TOLERANCE
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
PACKAGING
FOR EXAMPLE: ABOVE GLOBAL ORDER Y2021 80R5000 V 9 L:
TYPE: Burden-C
VALUE: 80.5
ABSOLUTE TOLERANCE: ± 0.005 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
Burden-C
Burden-C
Burden-J
Burden-K
Burden-L
Burden-Z
Burden-A
MODEL
PART DESCRIPTION: Burden-C T 80R5000 V B
T
T
= lead (Pb)-free
None = tin/lead alloy
TERMINATION
80Ω500
RESISTANCE VALUE
80R00
= 80.00
V
V
= ± 0.005 %
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
TOLERANCE
B
PACKAGING
B
= bulk pack
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give customers the choice of central-factory sourcing or local manufacturing—ideal for urgently needed high precision
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and tolerances of 0.005%
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Document No.: 63258
Revision: 04-Dec-2014
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Revision: 15-Jul-2014
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