WK2, WR4, WR5, WK8
www.vishay.com
Vishay Draloric
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
TECHNICAL SPECIFICATIONS
DESCRIPTION
Imperial size
Resistance range
Resistance tolerance
Temperature coefficient
Rated dissipation,
P
70
Operating voltage,
U
max.
AC/DC
(1)
Operating temperature range
(2)
Thermal resistance (R
th
)
Insulation voltage:
1 min;
U
ins
Failure rate
Max. resistance change for resistance
range,
R
max., after: load (1000 h,
P
70
)
± (5 %
R
+ 0.1
)
> 500 V
< 1 x 10
-8
/h
± (5 %
R
+ 0.1
)
± (5 %
R
+ 0.1
)
± (2 %
R
+ 0.1
)
140 K/W
WK2
0207
0.22
to
1 M
± 1 %, ± 2 %, ± 5 %
± 50 ppm/K,
± 100 ppm/K,
± 200 ppm/K
1W
500 V
WR4
0414
0.33
to
1 M
± 2 %, ± 5 %
± 200 ppm/K
2W
500 V
-55 °C to +200 °C
100 K/W
70 K/W
60 K/W
WR5
0617
0.22
to
560 k
± 2 %, ± 5 %
± 200 ppm/K
3W
750 V
WK8
0922
0.22
to
100 k
± 2 %, ± 5 %
± 200 ppm/K
4W
750 V
Notes
(1)
Rated voltage
P
x
R
.
(2)
For values < 10
the upper limiting temperature is 155 °C. The power rating is correspondingly lower and can be calculated by
R
.
th
E.g. for WK8 -
R
th
is 60 K/W; to calculate power P for < 10R; T
ambient
= 25 °C
P = T
Upper Limiting
- T
Ambiant
/R
th
= (155 - 25) / 60 = 2.16 W
AUTOMOTIVE QUALIFICATION
DESCRIPTION
Qualifications
WK2
AEC-Q200
WR4
AEC-Q200
WR5
-
WK8
-
Revision: 03-Mar-16
Document Number: 20128
1
For technical questions, contact:
filmresistorsleaded@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
WK2, WR4, WR5, WK8
www.vishay.com
Vishay Draloric
TOLERANCE
±1%
±2%
±5%
±5%
±2%
± 5%
±2%
±5%
±2%
±5%
RESISTANCE
4.7
to 1 M
4.7
to 1 M
4.7
to 1 M
0.22
to 1
M
1
to 1 M
0.33
to 1
M
1
to 100 k
0.22
to 560 k
1
to 68 k
0.22
to 100 k
E-SERIES
E24; E96
E24; E48
E24
E24
E24; E96
E24
E24; E96
E24
E24; E48
E24
TEMPERATURE COEFFICIENT AND RESISTANCE RANGE
TYPE / SIZE
WK2
TCR
± 50 ppm/K
± 100 ppm/K
± 100 ppm/K
± 200 ppm/K
± 200 ppm/K
± 200 ppm/K
± 200 ppm/K
± 200 ppm/K
± 200 ppm/K
± 200 ppm/K
WR4
WR5
WK8
PART NUMBER AND PRODUCT DESCRIPTION
Part Number: WK202070C1001FD500
W
K
2
0
2
0
7
TCR
0
C
1
0
0
1
F
D
5
0
SPECIAL
0
TYPE / SIZE
WK2
= WK20207
WR4
= WR40414
WR5
= WR50617
WK8
= WK80922
VARIANT
0
= neutral
RESISTANCE
3 digit value
1 digit multiplier
MULTIPLIER
7
= *10
-3
8
= *10
-2
9
= *10
-1
0
= *10
0
1
= *10
1
2
= *10
2
3
= *10
3
4
= *10
4
5
= *10
5
6
= *10
6
1K0
RESISTANCE VALUE
49K9
= 49.9 k
50R1
= 50.1
1K0
= 1.0 k
TOLERANCE
(1)
F
=±1%
G
=±2%
J
=±5%
PACKAGING
22
= A2
25
= A5
D5
= R5
5C
= AC
G1
= R1
41
= A1 G73
51
= A1 G77
FE
= RE G73
GP
= RP
0
= standard
(for WK8 only)
C
= ± 50 ppm/K
B
= ± 100 ppm/K
A
= ± 200 ppm/K
00
= standard
Product Description: WK2 50 1K0 1 % R5
WK2
TYPE / SIZE
WK2
WR4
WR5
WK8
50
TCR
±
50
ppm/K
±
100
ppm/K
±
200
ppm/K
1%
TOLERANCE
±
1%
±
2%
±
5%
R5
PACKAGING
A2
A5
R5
AC
R1
41
51
FE
GP
Note
(1)
See temperature coefficient and resistance range table for selecting correct TCR and tolerance combination.
PACKAGING
TYPE / SIZE
WK2
CODE
A2
A5
R5
A1
WR4
RE
A1
WR5
RP
AC
WK8
R1
Revision: 03-Mar-16
1500
500
1000
2500
1000
QUANTITY
2000
5000
5000
1000
PACKAGING STYLE
Taped acc. to IEC 60286-1
fan-folded in a box
Taped acc. to IEC 60286-1
on a reel
Taped acc. to IEC 60286-1
fan-folded in a box
Taped acc.to IEC 60286-1
on a reel
Taped acc. to IEC 60286-1
fan-folded in a box
Taped acc. to IEC 60286-1
on a reel
Taped acc. to IEC 60286-1
fan-folded in a box
Taped acc.to IEC 60286-1
on a reel
WIDTH
53 mm
PITCH
5 mm
5 mm
5 mm
73 mm
5 mm
5 mm
77 mm
10 mm
119 mm x 353 mm x 353 mm
120 mm x 118 mm x 412 mm
77 mm
10 mm
119 mm x 353 mm x 353 mm
DIMENSION
72 mm x
55
mm x 258 mm
75 mm x
114
mm x 260 mm
93 mm x 300 mm x 298 mm
95 mm x 57 mm x 260 mm
105 mm x 315 mm x 305 mm
155 mm x 110 mm x 410 mm
Document Number: 20128
2
For technical questions, contact:
filmresistorsleaded@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
WK2, WR4, WR5, WK8
www.vishay.com
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)
.
Vishay Draloric
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.
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.
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.
Revision: 03-Mar-16
Document Number: 20128
3
For technical questions, contact:
filmresistorsleaded@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
WK2, WR4, WR5, WK8
www.vishay.com
FUNCTIONAL PERFORMANCE
Vishay Draloric
Rated Power in %
120
100
80
60
40
20
0
-55
0
50 70
100
150
200
250
300
360
WK2
WR4
WR5
WK8
Derating
Ambient Temperature in °C
Temperature Rise in °C
300
250
200
150
100
50
0
0
1.0
2.0
3.0
4.0
5.0
WK2
WR4
WR5
WK8
Temperature Rise
Power in W
Power Rating
P
in W
10
3
WK8
WR5
WR4
WK2
10
2
10
1
10
0
10
-1 -5
10
Secondary Conditions:
a ) P u lse r a ti n g
P
→
0
b)
ϑu ≤
70 °C
10
-4
10
-3
10
-2
10
-1
10
0
10
Single Pulse
Square Pulse
t
i
in s
Revision: 03-Mar-16
Document Number: 20128
4
For technical questions, contact:
filmresistorsleaded@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
WK2, WR4, WR5, WK8
www.vishay.com
Vishay Draloric
Power Rating
P
in W
10
3
WK8
WR5
10
2
WR4
WK2
10
1
Secondary Conditions:
a)
P
≤
P
70
(permissible constant
power at
ϑu
= 70 °C)
b)
ϑu ≤
70 °C
10
0
10
-1 -5
10
10
-4
10
-3
10
-2
10
-1
10
0
10
Continuous Pulse
Square Pulse
t
i
in s
Pulse Voltage
Û
max.
in V
Secondary Conditions:
a)
ϑu ≤
70 °C
2000
WR5 / WK8
WR4
WK2
1000
0
-5
10
10
-4
10
-3
10
-2
10
-1
10
0
10
Max. Pulse Voltage
Square Pulse
t
i
in s
Non-Linearity A3 in dB
130
120
WR4
110
100
90
1K
10K
WR5 / WK8
100K
1M
10M
Non-Linearity
Resistance Value in
Ω
Revision: 03-Mar-16
Document Number: 20128
5
For technical questions, contact:
filmresistorsleaded@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Analog electronics
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