WK/WR
Vishay Draloric
Metal Oxide Resistors, High Power
FEATURES
•
Rugged metal oxide film
•
Lead (Pb)-free solder contacts
•
Pure tin plating provides compatibility with
lead (Pb)-free and lead containing soldering processes
•
Compatible with "Restriction of the use of Hazardous
Substances" (RoHS) directive 2002/95/EC (issue 2004)
•
High power dissipation in small size (1 W/0207 size to
4 W/0922 size)
•
High temperature coating (up to 200 °C), nonflammable
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
WK2
WK2
WK2
WR4
WR5
WK8
SIZE
0207
0207
0207
0414
0617
0922
POWER RATING
P
70 °C
W
1.0
1.0
1.0
2.0
3.0
4.0
LIMITING ELEMENT
VOLTAGE MAX.
V≅
500
500
500
500
750
750
TEMPERATURE
COEFFICIENT
ppm/K
± 50
± 100
± 200
± 200
± 200
± 200
TOLERANCE
%
±1
±2
±5
±5
±2
±5
±2
±5
±2
±5
RESISTANCE
RANGE
Ω
4R7 - 1M0
1R0 - 1M0
R18 - 10M
0R18 - 10M
1R0 - 1M0
R18 - 10M
1R0 - 100K
R22 - 560K
1R0 - 68K
R22 - 100K
E-SERIES
96
48
24
24
48
24
48
24
48
24
Notes:
• Coating: green
• Marking: WR4 has color code marking does not have a TCR band. WR5 and WK8 are printed marked. For further information see appropriate
catalog or web page.
TECHNICAL SPECIFICATIONS
PARAMETER
Rated Dissipation at 70 °C
Limiting Element Voltage
(1)
Insulation Voltage (1 min)
Thermal Resistance (max)
Insulation Resistance
Voltage Coefficient
Thermal Time Constant
Category Temperature Range
(2)
Terminal Strength, axial
Failure Rate
Weight
UNIT
W
V≅
V
eff
K/W
Ω
1/V
s
°C
N
10
-8
/h
g
0.2
0.7
> 60
14
20
- 55 to + 200
> 80
<1
1.5
3.5
> 80
> 80
WK2
1.0
500
> 500
≤
140
WR4
2.0
500
> 500
≤
100
> 10
9
< 10
-7
35
70
WR5
3.0
750
> 500
≤
70
WK8
4.0
750
> 500
≤
60
Notes:
(1)
Rated Voltage
P
x
R
(2)
For values < 10R the upper limiting temperature is 155 °C. The power rating is correspondingly lower and can be caculated by R
th
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Document Number: 20128
Revision: 14-Sep-07
WK/WR
Metal Oxide Resistors, High Power
Vishay Draloric
PART NUMBER AND PRODUCT DESCRIPTION WK2-SERIES
PART NUMBER: WK202070C1001FD500
W
MODEL/SIZE
WK20207
K
2
0
2
0
7
0
TCR
C
1
0
VALUE
0
1
F
D
5
SPECIAL
up to 2 digits
00
= standard
SPECIAL CHARACTER
0
= neutral
TOLERANCE
F
=±1%
G
=±2%
J
=±5%
PACKAGING
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
0
TCR
0
1
0
VALUE
0
0
J
5
C
PACKAGING
5C
= AC
G1
= R1
SPECIAL
up to 2 digits
00
= standard
SPECIAL CHARACTER
0
= neutral
TOLERANCE
G
=±2%
J
=±5%
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
RESISTANCE VALUE
100R
= 100
Ω
47K
= 47 kΩ
5%
TOLERANCE
±
2
%
±
5
%
AC
PACKAGING
(1)
AC
R1
Note:
(1)
Please refer to table PACKAGING.
Document Number: 20128
Revision: 14-Sep-07
For technical questions, contact: ff1aresistors@vishay.com
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157
WK/WR
Vishay Draloric
Metal Oxide Resistors, High Power
PART NUMBER AND PRODUCT DESCRIPTION WR-SERIES
PART NUMBER: WR404140A1001GFE00
W
MODEL/SIZE
WR40414
WR50617
R
4
0
4
1
4
0
TCR
A
1
0
VALUE
0
1
G
F
E
SPECIAL
up to 2 digits
00
= standard
SPECIAL CHARACTER
0
= neutral
TOLERANCE
G
=±2%
J
=±5%
PACKAGING
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
5
PRODUCT DESCRIPTION: WR4 1K0 2 % RE
WR4
MODEL
WR4
WR5
1K0
RESISTANCE VALUE
1K0
= 1.0 kΩ
51R0
= 51.0
Ω
2%
TOLERANCE
±
2
%
±
5
%
RE
PACKAGING
(1)
A1 (G73)
A1 (G77)
RE (G73)
RP
Note:
(1)
Please refer to table PACKAGING.
• The PART NUMBER shown above is to facilitate the unified part numbering system for ordering products.
PACKAGING
REEL
MODEL
PIECES/REEL
CODE
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
5000
2500
1500
1000
R5
RE
RP
R1
DIMENSIONS
6 mm
(1)
DIMENSIONS
[in millimeters]
L
1
L
D
d
MODEL
D
WK2
2.5
- 0.5
4.1
- 0.5
6.0
- 0.5
9.0
- 0.5
L
6.3
- 0.5
12.0
- 1.5
16.5
- 1.5
20.0
- 1.5
L
1max
8.0
16.0
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 IEC60286-1
• D and L measured in acc. with IEC60294
• d according to IEC60301
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For technical questions, contact: ff1aresistors@vishay.com
Document Number: 20128
Revision: 14-Sep-07
WK/WR
Metal Oxide Resistors, High Power
Vishay Draloric
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]
1000
WK
8
WR 5
WR 4
WK 2
10
Secondary Conditions:
1
a)
P
ϑ
b)
ϑu
≤
70
°C
c) Û
MAX
see diagram
below
d) ~ 10R
0.1
10
-4
10
-3
10
-5
DERATING
POWER RATING
P
[W]
10
3
WK
8
WR 5
10
2
100
WR 4
WK 2
10
1
Secondary Conditions:
a)
P
≤
P
70
(permissible constant
power at
ϑu
= 70 °C)
10
0
b)
ϑu
≤
70 °C
c) Û
MAX
see diagram
below
d) ~ 10R
10
-1
10
-4
10
-3
10
-5
10
-2
10
-2
PULSE RATING
P
PULSE VOLTAGE Û
MAX
[V]
O
10
10
-1
10
0
SQUARE PULSE
t
i
[s]
PULSE RATING
P
≤
P
70
10
10
0
10
-1
SQUARE PULSE
t
i
[s]
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]
120
WR5/WK8
110
WR4
CURRENT NOISE
µ
V/V
10
1
WR5/WK8
0.1
WR4
100
90
0.01
10K
1K
10K
100K
NON-LINEARITY
Document Number: 20128
Revision: 14-Sep-07
1M
10M
RESISTANCE VALUE IN
Ω
100K
CURRENT NOISE
1M
10M
RESISTANCE VALUE IN
Ω
For technical questions, contact: ff1aresistors@vishay.com
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159
WK/WR
Vishay Draloric
Metal Oxide Resistors, High Power
PERFORMANCE
TEST
Rated Dissipation at 70 °C
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, IEC 60068-2-14
Climatic Sequence
IEC 60115-1 4.23
Damp Heat Steady State
IEC 60115-1 4.24, IEC 60068-2-3
Resistance to Soldering Heat
IEC 60115-1 4.18, IEC 60068-2-20
Robustness of Terminations
IEC 60115-1 4.16
Vibration
IEC 60115-1 4.22
Note:
(1)
Limiting for change of resistance at test
CONDITIONS OF TEST
REQUIREMENTS
(1)
WK2 = ± 1.5 %
WK4/8 = ± 2.0 %
WR4/5 = ± 5.0 %
≤
±1%
≤
± 0.25 %
≤
± 0.25 %
≤
± 0.5 %
≤
± 1.5 %
≤
± 0.25 %
≤
± 0.25 %
≤
± 0.25 %
1000 hours at 70 °C 1.5 hours “ON”, 0.5 hours “OFF”
1000 hours at 155 °C without load
Short time overload 5 seconds 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 at 40 °C and 93 % relative humidity
10 seconds at 260 °C solder bath temperature
Tensile, bending and torsion
0.75 mm or 10 g, 10 Hz - 500 Hz 6 hours
APPLICABLE SPECIFICATIONS
• CECC 40000
• EN 140000 IEC 60115-1
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For technical questions, contact: ff1aresistors@vishay.com
Document Number: 20128
Revision: 14-Sep-07
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