WK2, WR4, WR5, WK8
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High Pulse Load, High Power Metal Oxide Leaded Resistors
FEATURES
• High power pulse withstanding capability
(up to 1 kW)
• High power dissipation in small size
(1 W / 0207 size to 4 W / 0922 size)
• WK2 and WR4 are AEC-Q200 qualified
• High temperature (up to 200 °C), heat resistant
encapsulation
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
APPLICATIONS
• Automotive electronics
• Industrial electronics
• Power supplies
Notes
(1) Rated voltage .
(2) For values < 10 the upper limiting temperature is 155 °C. The power rating is correspondingly lower and can be calculated by Rth.
E.g. for WK8 - Rth is 60 K/W; to calculate power P for < 10R; Tambient = 25 °C
P = TUpper Limiting - TAmbiant/Rth = (155 - 25) / 60 = 2.16 W
TECHNICAL SPECIFICATIONS
DESCRIPTION WK2 WR4 WR5 WK8
Imperial size 0207 0414 0617 0922
Resistance range 0.22 to 1 M0.33 to 1 M0.22 to 560 k0.22 to 100 k
Resistance tolerance ± 1 %, ± 2 %, ± 5 % ± 2 %, ± 5 % ± 2 %, ± 5 % ± 2 %, ± 5 %
Temperature coefficient
± 50 ppm/K,
± 100 ppm/K,
± 200 ppm/K
± 200 ppm/K ± 200 ppm/K ± 200 ppm/K
Rated dissipation, P70 1 W2 W3 W4 W
Operating voltage, Umax. AC/DC (1) 500 V 500 V 750 V 750 V
Operating temperature range (2) -55 °C to +200 °C
Thermal resistance (Rth) 140 K/W 100 K/W 70 K/W 60 K/W
Insulation voltage:
1 min; Uins > 500V
Failure rate < 1 x 10-8/h
Max. resistance change for resistance
range, R max., after: load (1000 h, P70)± (5 % R + 0.1 )± (5 % R + 0.1 )± (5 % R + 0.1 )± (2 % R + 0.1 )
AUTOMOTIVE QUALIFICATION
DESCRIPTION WK2 WR4 WR5 WK8
Qualifications AEC-Q200 AEC-Q200 - -
P x R
WK2, WR4, WR5, WK8
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Note
(1) See temperature coefficient and resistance range table for selecting correct TCR and tolerance combination.
TEMPERATURE COEFFICIENT AND RESISTANCE RANGE
TYPE / SIZE TCR TOLERANCE RESISTANCE E-SERIES
WK2
± 50 ppm/K ± 1
%
4.7 to 1 M
E2
4; E96
± 100 ppm/K ± 2
%
4.7 to 1 ME24; E48
± 100 ppm/K ± 5
%
4.7 to 1 ME24
± 200 ppm/K ± 5
%
0.22 to 1 M
E2
4
WR4 ± 200 ppm/K ± 2
%
1 to 1 ME24; E96
± 200 ppm/K ± 5
%
0.33 to 1 ME24
WR5 ± 200 ppm/K ± 2
%
1 to 100 k
E2
4; E96
± 200 ppm/K ± 5
%
0.22 to 560 kE24
WK8 ± 200 ppm/K ± 2
%
1 to 68 k
E2
4; E48
± 200 ppm/K ± 5
%
0.22 to 100 kE24
PART NUMBER AND PRODUCT DESCRIPTION
Part Number: WK202070C1001FD500
TYPE / SIZE VARIANT TCR RESISTANCE TOLERANCE (1) PACKAGING SPECIAL
WK2 = WK20207
WR4 = WR40414
WR5 = WR50617
WK8 = WK80922
0 = neutral 0 = standard
(for WK8 only)
C = ± 50 ppm/K
B = ± 100 ppm/K
A = ± 200 ppm/K
3 digit value
1 digit multiplier
MULTIPLIER
7 = *10-3
8 = *10-2
9 = *10-1
0 = *100
1 = *101
2 = *102
3 = *103
4 = *104
5 = *105
6 = *106
F = ± 1 %
G = ± 2 %
J = ± 5 %
22 = A2
25 = A5
D5 = R5
5C = AC
G1 = R1
41 = A1 G73
51 = A1 G77
FE = RE G73
GP = RP
00 = standard
Product Description: WK2 50 1K0 1 % R5
WK2 50 1K0 1 % R5
TYPE / SIZE TCR RESISTANCE VALUE TOLERANCE PACKAGING
WK2
WR4
WR5
WK8
± 50 ppm/K
± 100 ppm/K
± 200 ppm/K
49K9 = 49.9 k
50R1 = 50.1
1K0 = 1.0 k
± 1 %
± 2 %
± 5 %
A2
A5
R5
AC
R1
41
51
FE
GP
PACKAGING
TYPE / SIZE CODE QUANTITY PACKAGING STYLE WIDTH PITCH DIMENSION
WK2
A2 2000 Taped acc. to IEC
6028
6
-
1
fan-folded in a
bo
x
53 mm 5
mm
72 mm x 55 mm x 258 mm
A5 5000 5 mm 75 mm x 114 mm x 260 mm
R5 5000 Taped acc. to IEC
6028
6
-
1
on a reel
73
mm
5
mm
93 mm x 300 mm x 298 mm
WR4
A1 1000 Taped acc. to IEC
6028
6
-
1
fan-folded in a
bo
x
5
mm
95 mm x 57 mm x 260 mm
RE 2500 Taped acc.to IEC
60286-1
on a reel 5
mm
105 mm x 315 mm x 305 mm
WR5
A1 1000 Taped acc. to IEC
6028
6-1
fan-folded in a
box
77 mm 10 mm
155 mm x 110 mm x 410 mm
R
P
1500 Taped acc. to IEC
6028
6-1
on a reel 119 mm x 353 mm x 353 mm
WK8
AC 500
Taped acc. to IEC
6028
6
-
1
fan-folded in a
bo
x
77 mm 10 mm
120 mm x 118 mm x 412 mm
R1 1000 Taped acc.to IEC
60286-1
on a reel 119 mm x 353 mm x 353 mm
K202070C1W01FD5000
WK2, WR4, WR5, WK8
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DESCRIPTION
Production is strictly controlled and follows an extensive set
of instructions established for reproducibility. A
homogeneous film of metal oxide is deposited on a high
grade ceramic body and conditioned to achieve the desired
temperature coefficient. Plated steel termination caps are
firmly pressed on the metallized rods. Mostly, a special laser
is used to achieve the target value by smoothly cutting a
helical groove in the resistive layer without damaging the
ceramics. Connecting wires of electrolytic copper plated
with 100 % tin are welded to the termination caps. The
resistor elements are covered by a green protective coating
designed for electrical, mechanical and climatic protection.
Four or five color code rings designate the resistance value
and tolerance in accordance with IEC 60062 (1). WK2 and
WR4 are color coded while WR5 and WK8 are print marked.
The result of the determined production is verified by an
extensive testing procedure performed on 100 % of the
individual resistors. Only accepted products are stuck
directly on the adhesive tapes in accordance with
IEC 60286-1 (1).
MATERIALS
Vishay acknowledges the following systems for the
regulation of hazardous substances:
• IEC 62474, Material Declaration for Products of and for the
Electrotechnical Industry, with the list of declarable
substances given therein
• The Global Automotive Declarable Substance List
(GADSL) (2)
• The REACH regulation (1907/2006/EC) and the related list
of substances with very high concern (SVHC) for its supply
chain
The products do not contain any of the banned substances
as per IEC 62474, GADSL, or the SVHC list, see
www.vishay.com/how/leadfree.
Hence the products fully comply with the following
directives:
• 2000/53/EC End-of-Life Vehicle Directive (ELV) and
Annex II (ELV II)
• 2011/65/EU Restriction of the Use of Hazardous
Substances Directive (RoHS) with amendment
2015/863/EU
• 2012/19/EU Waste Electrical and Electronic Equipment
Directive (WEEE)
Vishay pursues the elimination of conflict minerals from its
supply chain, see the Conflict Minerals Policy at
www.vishay.com/doc?49037.
ASSEMBLY
The resistors are suitable for processing on automatic
insertion equipment and cutting and bending machines.
Excellent solderability is proven, even after extended
storage. They are suitable for automatic soldering using
wave or dipping.
The resistors are completely lead (Pb)-free, the pure tin
plating provides compatibility with lead (Pb)-free and
lead-containing soldering processes. The immunity of the
plating against tin whisker growth, in compliance with
IEC 60068-2-82, has been proven under extensive testing.
The encapsulation is resistant to cleaning solvent (3)
specified in IEC 60115-1. The suitability of conformal
coatings, potting compounds and their processes, if
applied, shall be qualified by appropriate means to ensure
the long-term stability of the whole system
APPROVALS
WK2 and WR4 are AEC-Q200 qualified which makes these
products ideal to be used in automotive applications.
RELATED PRODUCTS
For a correlated range of Power Metal Film Resistors with
small size-high rated dissipation see the PR series
datasheet: www.vishay.com/doc?28729.
Notes
(1) The quoted IEC standards are also released as EN standards with the same number and identical contents.
(2) Global Automotive Declarable Substance List, see www.gadsl.org. All products comply with the IEC 62474, Material Declaration for Products
of and for the Electrotechnical Industry.
CEFIC (European Chemical Industry Council), EECA (European Electronic Component Manufacturers Association), EICTA (European
trade organization representing the information and communications technology and consumer electronics), see
www.digitaleurope.org/SearchResults.aspx?Search=eicta.
(3) Other cleaning solvents with aggressive chemicals should be evaluated in actual cleaning process for their suitability.
WK2, WR4, WR5, WK8
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FUNCTIONAL PERFORMANCE
Ambient Temperature in °C
Rated Power in %
050 100 360
Derating
-55 70 150 200 250 300
20
0
40
60
80
120
100
WK2
WR4
WR5
WK8
Power in W
Temperature Rise in °C
1.0 2.0 3.0 5.0
Temperature Rise
0 4.0
50
0
100
150
200
300
250
WR4
WK2
WR5
WK8
Square Pulse t
i
in s
Power Rating P in W
10
-3
10
-2
10
-1
10
Single Pulse
10
-5
10
0
10
-1
10
0
10
1
10
3
10
2
WR5
WR4
WK8
WK2
Secondary Conditions:
a) Pulse rating P → 0
b) ϑu≤ 70 °C
10
-4
WK2, WR4, WR5, WK8
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Square Pulse t
i
in s
Power Rating P in W
10
-3
10
-2
10
-1
10
Continuous Pulse
10
-5
10
0
10
-1
10
0
10
1
10
3
10
2
10
-4
Secondary Conditions:
a) ≤ 70 (permissible constant
power at ϑu = 70 °C)
b) ϑu≤ 70 °C
PP
WR5
WR4
WK8
WK2
Max. Pulse Voltage
WR5 / WK8
WR4
WK2
Secondary Conditions:
a)
ϑu ≤ 70 °C
Square Pulse t
i
in s
Pulse Voltage
Û
max.
in V
10
-3
10
-2
10
-1
1010
-5
10
0
0
1000
2000
10
-4
Resistance Value in Ω
Non-Linearity A3 in dB
10K 100K 1M 10M
Non-Linearity
1K
WR4
WR5 / WK8
90
100
110
120
130
WK2, WR4, WR5, WK8
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Resistance Value in Ω
Current Noise in µV/V
100K 1M 10M
Current Noise
10K
0.1
1
10
WR4
WR5 / WK8
0.01
WK2, WR4, WR5, WK8
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TESTS PROCEDURES AND REQUIREMENTS
All tests are carried out in accordance with the following
specifications:
• EN 60115-1, generic specification (includes tests)
The test and requirements table contains only the most
important tests. For the full test schedule refer to the
documents listed above.
The tests are carried out in accordance with IEC 60068-2-xx
test method and under standard atmospheric conditions in
accordance with IEC 60068-1, 5.3.
Climatic category -40 / 200 / 56 (rated temperature range:
lower category temperature, upper category temperature;
damp heat, steady state, test duration: 56 days) is valid.
Unless otherwise specified the following values apply:
• Temperature: 15 °C to 35 °C
• Relative humidity: 45 % to 75 %
• Air pressure: 86 kPa to 106 kPa (860 mbar to 1060 mbar).
For performing some of the tests, the components are
mounted on a test board in accordance with IEC 60115-1,
4.31.
In the Test Procedures and Requirements table, only the
tests and requirements are listed with reference to the
relevant clauses of IEC 60115-1 and IEC 60068-2-xx test
methods. A short description of the test procedure is also
given.
TEST PROCEDURES AND REQUIREMENTS
IEC 60115-1
CLAUSE
IEC 60068-2
TEST
METHOD
TEST PROCEDURE REQUIREMENTS PERMISSIBLE
CHANGE (Rmax.)
4.13 - Short time overload
Room temperature;
P = 6.25 x Pn;
(voltage not more than 2 x limiting voltage);
5 s
± (0.25 %R +0.05)
4.16
21 (Ua1)
21 (Ub)
21 (Uc)
Robustness of
terminations Tensile, bending, and torsion No damage
± (0.25 %R +0.05)
4.18 20 (Tb) Resistance to
soldering heat
Unmounted components
(260 ± 5) °C; (10 ± 1) s ± (0.25 %R +0.05)
4.19 14 (Na) Rapid change of
temperature
30min at -55 °C and
30min at +155 °C;
5cycles
± (0.25 %R +0.05)
4.20 29 (Eb) Bump 3x1500bumps in three directions; 40g No damage
± (0.25 %R +0.05)
4.22 6 (Fc) Vibration
Frequency 10 Hz to 500 Hz;
displacement 1.5 mm or acceleration 10 g;
3 directions;
total 6 h (3 x 2 h)
No damage
± (0.25 %R +0.05)
4.23 Climatic sequence:
Rins min.: 1 G
± (0.5 % R +0.1)
4.23.2 2 (Ba) Dry heat 16 h; 155 °C
4.23.3 30 (Db) Damp heat,
cyclic
24 h; 55 °C
90 % to 100 % RH; 1 cycle
4.23.4 1 (Aa) 1st cycle,
cold 2 h; -55 °C
4.23.5 13 (M) Low air pressure 2 h; 8.5 kPa
15 °C to 35 °C
4.23.6 30 (Db) Damp heat,
remaining cyclic
5days; 55°C
95% to100 %RH; 5 cycles
4.23.7 30 (Db) DC load apply rated power for 1 min
4.24 78 (Cab) Damp heat
(steady state)
56 days; 40 °C;
90 % to 95 % RH;
loaded with 0.01 P70
(steps: 0 V to 100 V)
± (1.5 %R +0.1)
4.25.1 - Endurance
(at70 °C)
1000 h; loaded with P70 or Umax.;
1.5 h ON and 0.5 h OFF
WK2, WR4, WR5 ± (5 % R + 0.1 )
WK8 ± (2 % R + 0.1 )
4.25.3 - Endurance at 200 °C 1000 h; without load WK2, WR4 ± (5 % R + 0.1 )
WR5, WK8 ± (1 % R + 0.1 )
WK2, WR4, WR5, WK8
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DIMENSIONS
Notes
(1) 9 mm for WR5/WK8.
(2) “e” depicts recommended pitch for mounting the resistor.
DIMENSIONS - Leaded resistor types, mass and relevant physical dimensions
TYPE DMAX.
(mm)
L MAX.
(mm)
L1 MAX.
(mm)
d
(mm)
e (2)
(mm)
MASS
(g)
WK2 2.5 6.5 8.0 0.58 ± 0.05 7.5 0.2
WR4 3.9 10.0 12.0 0.78 ± 0.05 15.0 0.7
WR5 6.0 16.5 20 0.78 ± 0.05 17.5 1.5
WK8 9.0 20.0 24.0 0.78 ± 0.05 22.5 3.5
L1
Ld
D
e
6 mm (1)
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RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
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including but not limited to the warranty expressed therein.
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