WK/WR
Vishay Draloric
High Power Metal Oxide Leaded Resistors
FEATURES
•
Rugged metal oxide film
•
High power dissipation in small size (1 W/0207
size to 4 W/0922 size)
•
High temperature coating (up to 200 °C),
non-flammable
•
Lead (Pb)-free solder contacts
•
Pure tin plating provides compatibility with lead (Pb)-free
and lead containing soldering processes
•
Compliant to RoHS directive 2002/95/EC
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
SIZE
RATED DISSIPATION
P
70
W
1.0
1.0
1.0
2.0
LIMITING ELEMENT
VOLTAGE
U
max.
V≅
500
500
500
500
TEMPERATURE
COEFFICIENT
ppm/K
± 50
± 100
± 200
± 200
TOLERANCE
%
±1
±2
±5
±5
±2
±5
±2
±5
±2
±5
RESISTANCE
RANGE
4.7
Ω
to 1 MΩ
1
Ω
to 1 MΩ
0.22
Ω
to 1 MΩ
0.22
Ω
to 1 MΩ
1
Ω
to 1 MΩ
0.33
Ω
to 1 MΩ
1
Ω
to 100 kΩ
0.22
Ω
to 560 kΩ
1
Ω
to 68 kΩ
0.22
Ω
to 100 kΩ
E-SERIES
WK2
WK2
WK2
WR4
0207
0207
0207
0414
E24, E96
E24, E48
E24
E24
E24, E48
E24
E24, E48
E24
E24, E48
E24
WR5
0617
3.0
750
± 200
WK8
Notes
0922
4.0
750
± 200
• Coating: Green
• Marking: WK2 and WR4 have color code marking. WR4 has no TCR band. WR5 and WK8 are printed marked.
TECHNICAL SPECIFICATIONS
PARAMETER
Rated Dissipation,
P
70
Limiting Element Voltage,
U
max.(1)
Insulation Voltage,
U
ins
(1 Min)
Thermal Resistance,
R
th
Insulation Resistance
Category Temperature Range
(2)
Failure Rate
Weight
Notes
(1)
(2)
UNIT
W
V≅
V
K/W
Ω
°C
10
-8
/h
g
WK2
1.0
500
> 500
≤
140
WR4
2.0
500
> 500
≤
100
> 10
9
- 55 to + 200
<1
WR5
3.0
750
> 500
≤
70
WK8
4.0
750
> 500
≤
60
0.2
0.7
1.5
3.5
Rated Voltage
P
x
R
For values < 10R the upper limiting temperature is 155 °C. The power rating is correspondingly lower and can be calculated by
R
th
.
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Document Number: 20128
Revision: 03-Feb-10
WK/WR
High Power Metal Oxide Leaded Resistors
Vishay Draloric
PART NUMBER AND PRODUCT DESCRIPTION WK2-SERIES
PART NUMBER: WK202070C1001FD500
W
MODEL/SIZE
WK20207
K
2
0
2
0
7
TCR
0
C
1
VALUE
0
0
1
F
D
5
0
0
SPECIAL
Up to 2 digits
00
= Standard
VARIANT
0
= Neutral
TOLERANCE
F
=±1%
G
=±2%
J
=±5%
PACKAGING
(1)
22
= A2
25
= A5
D5
= R5
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
= *10
0
1
= *10
1
2
= *10
2
3
= *10
3
4
= *10
4
5
= *10
5
6
= *10
6
PRODUCT DESCRIPTION: WK2 50 1K0 1 % R5
WK2
MODEL
WK2
50
TCR
±
50
ppm/K
±
100
ppm/K
±
200
ppm/K
1K0
RESISTANCE VALUE
49K9
= 49.9 kΩ
50R1
= 50.1
Ω
1K0
= 1.0 kΩ
1%
TOLERANCE
±
1
%
±
2
%
±
5
%
R5
PACKAGING
(1)
A2
A5
R5
PART NUMBER AND PRODUCT DESCRIPTION WK8-SERIES
PART NUMBER: WK80922001000J5C00
W
MODEL/SIZE
WK80922
K
8
0
9
2
2
TCR
0
0
1
VALUE
0
0
0
J
5
C
0
0
SPECIAL
Up to 2 digits
00
= Standard
VARIANT
0
= Neutral
TOLERANCE
G
=±2%
J
=±5%
PACKAGING
(1)
5C
= AC
G1
= R1
0
= Standard
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
PRODUCT DESCRIPTION: WK8 100R 5 % AC
WK8
MODEL
WK8
100R
TCR
100R
= 100
Ω
47K
= 47 kΩ
5%
TOLERANCE
±
2
%
±
5
%
AC
PACKAGING
(1)
AC
R1
PART NUMBER AND PRODUCT DESCRIPTION WR-SERIES
PART NUMBER: WR404140A1001GFE00
W
MODEL/SIZE
WR40414
WR50617
R
4
0
4
1
4
TCR
0
A
1
VALUE
0
0
1
G
F
E
0
0
SPECIAL
Up to 2 digits
00
= Standard
VARIANT
0
= Neutral
TOLERANCE
G
=±2%
J
=±5%
PACKAGING
(1)
41
= A1 G73
51
= A1 G77
FE
= RE G73
GP
= RP
A
= ± 200 ppm/K
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
2%
PRODUCT DESCRIPTION: WR4 1K0 2 % RE
WR4
MODEL
WR4
WR5
1K0
RESISTANCE VALUE
1K0
= 1.0 kΩ
51R0
= 51.0
Ω
RE
PACKAGING
(1)
A1 (G73)
A1 (G77)
RE (G73)
RP
TOLERANCE
±
2
%
±
5
%
Notes
(1)
Please refer to table PACKAGING
• The PART NUMBER shown above is to facilitate the unified part numbering system for ordering products
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Document Number: 20128
Revision: 03-Feb-10
WK/WR
Vishay Draloric
High Power Metal Oxide Leaded Resistors
PACKAGING
REEL
MODEL
PIECES/REEL
5000
2500
1500
1000
CODE
R5
RE
RP
R1
MIN. ORDER QTY
PACKAGING UNITS
1
2
2
2
PIECES/BOX
5000
2000
1000
1000
500
BOX
CODE
A5
A2
A1
A1
AC
MIN. ORDER QTY
PACKAGING UNITS
1
1
2
2
2
WK2
WR4
WR5
WK8
DIMENSIONS
6 mm
(1)
L
1
L
D
d
DIMENSIONS
[in millimeters]
MODEL
D
WK2
2.5
- 0.5
3.9
- 0.5
6.0
- 0.5
9.0
- 0.5
L
6.5
- 0.5
10.0
- 1.6
16.5
- 1.5
20.0
- 1.5
L
1 max.
8.0
12.0
20.0
24.0
B
53 ± 1
73 ± 1
77 ± 1
77 ± 1
d
0.6
0.8
0.8
0.8
e
7.5
15.0
17.5
22.5
e
B
WR4
WR5
WK8
Notes
(1)
9 mm for WR5/WK8
• Taping in acc. with IEC 60286-1
• D and L measured in acc. with IEC 60294
• d according to IEC 60301
TEMPERATURE RISE IN °C
300
250
200
150
100
50
0
0
1.0
2.0
3.0
4.0
5.0
POWER IN W
WK2
WR4
WR5
WK8
RATED POWER IN
%
120
100
80
60
40
20
0
- 55
0
40
80
70
120
160
200
240
280
320
360
AMBIENT TEMPERATURE IN °C
WK2
WR4
WR5
WK8
TEMPERATURE RISE
POWER RATING
P
[W]
10
3
WK
8
WR 5
WR 4
WK 2
10
1
Secondary Conditions:
a)
P
ϑ
b)
ϑu
≤
70
°C
c)
Û
max.
see diagram
below
d) ~ 10R
10
-4
10
-3
10
-2
DERATING
POWER RATING
P
[W]
10
3
WK
8
WR 5
10
2
10
2
WR 4
WK 2
10
1
Secondary Conditions:
a)
P
≤
P
70
(permissible constant
power at
ϑu
= 70 °C)
b)
ϑu
≤
70 °C
c)
Û
max.
see diagram
below
d) ~ 10R
10
-4
10
-3
10
-2
10
0
10
0
10
-1 -5
10
PULSE RATING
P
O
10
10
-1
10
0
SQUARE PULSE
t
i
[s]
10
-1 -5
10
PULSE RATING
P
≤
P
70
10
10
0
10
-1
SQUARE PULSE
t
i
[s]
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Document Number: 20128
Revision: 03-Feb-10
WK/WR
High Power Metal Oxide Leaded Resistors
Vishay Draloric
PULSE VOLTAGE
Û
max.
[V]
2000
WR 5/WK8
WR 4
WK 2
Secondary Conditions:
–
a)
P
max.
see diagram
below
b)
See diagram
below
c)
ϑu
≤
70 °C
1000
0
10
-5
10
-4
10
-3
10
-2
MAX. PULSE VOLTAGE
NON-LINEARITY A3 [dB]
130
10
10
-1
10
0
SQUARE PULSE
t
i
[s]
WR4
120
WR5/WK8
110
CURRENT NOISE
µ
V/V
10
1
WR5/WK8
0.1
WR4
100
90
0.01
10K
1K
10K
100K
NON-LINEARITY
PERFORMANCE
TEST
Rated Dissipation,
P
70
IEC 60115-1, 4.25.1
Endurance at UCT
IEC 60115-1, 4.25.3
Overload Test
IEC 60115-1, 4.13
Thermal Shock
IEC 60115-1, 4.19
Climatic Sequence
IEC 60115-1, 4.23
Damp Heat Steady State
IEC 60115-1, 4.24
Resistance to Soldering Heat
IEC 60115-1, 4.18
Robustness of Terminations
IEC 60115-1, 4.16
Vibration
IEC 60115-1, 4.22
Note
(1)
Limits for change of resistance at test
1M
10M
RESISTANCE VALUE IN
Ω
100K
CURRENT NOISE
1M
10M
RESISTANCE VALUE IN
Ω
CONDITIONS OF TEST
1000 h at 70 °C 1.5 h ON, 0.5 h OFF
1000 h at 200 °C without load
Short time overload 5 s at 2.5 x rated voltage or
≤
± twice the limiting
element voltage
Rapid change between upper and lower category temperature
Dry heat, damp heat cycle, cold, low air pressure
56 days; 40 °C; 90 % to 95 % RH; loaded with 0.01
P
70
10 s at 260 °C solder bath temperature
Tensile, bending and torsion
Frequency 10 Hz to 500 Hz; displacement 1.5 mm or
acceleration 10 g; three directions; 6 h
REQUIREMENTS
(ΔR MAX.)
(1)
WK2
≤
± (5 %
R
+ 0.1
Ω)
WK8
≤
± (2 %
R
+ 0.1
Ω)
WR4, WR5
≤
± (5 %
R
+ 0.1
Ω)
WK2, WR4
≤
± (5 %
R
+ 0.1
Ω)
WR5, WK8
≤
± (1 %
R
+ 0.1
Ω)
≤
± (0.25 %
R
+ 0.05
Ω)
≤
± (0.25 %
R
+ 0.05
Ω)
≤
± (0.5 %
R
+ 0.1
Ω)
≤
± (1.5 %
R
+ 0.1
Ω)
≤
± (0.25 %
R
+ 0.05
Ω)
≤
± (0.25 %
R
+ 0.05
Ω)
≤
± (0.25 %
R
+ 0.05
Ω)
APPLICABLE SPECIFICATIONS
• EN140100, EN60115-1, IEC 60115-1
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Document Number: 20128
Revision: 03-Feb-10
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay 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.
Document Number: 91000
Revision: 18-Jul-08
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