Aluminium Housed
Wirewound Resistors
Aluminium Housed
WH Series
Wirewound Resistors
·
High power dissipation up to 300W
·
WH
welded construction
All
Series
·
•
Suitable for severe environments
High power
up to 300W
·
•
Designed for
dissipation
thermal conductivity to heatsink
excellent
All welded construction
·
•
Spade terminal option
Suitable for severe environments
·
•
RoHS compliant
Designed for excellent thermal conductivity to heatsink
•
•
Spade terminal option
RoHS compliant
Electrical Data
Power rating at 25°C
Resistance range
TCR (-55° to 200°C)
Resistance tolerance
Low value limits
Isolation voltage
watts
ohms
ppm/°C
%
ohms
volts
WH5
10
0R01 to 10K
WH10
15
0R01 to 20K
WH25
25
2
0R01 to 44K
WH50
50
1, 2
0R015 to 120K
≥100R:
±25
0R01 at 10%
3000
DA
40
0R05 to 82K
Notes
On standard heatsink
<10R: ±75
1R at 1%
1500
AA
10
0R05 to 3K4
≥10R
to <100R: ±50
0R05 at 5%
3000
CA
25
0R05 to 33K
1(F), 2(G), 5(J) and 10(K)
0R5 at 2%
1500
BA
15
0R05 to 15K
WH50 0R015 at 10%
DC or AC peak
Notes
On standard heatsink
Note 1: For load at full rating mount on aluminium heatsink 30.5 cm x 30.5 cm x 1.5 mm
Note 2: WH25T & WH50T are additionally rated at 15A
CECC 40203-006 Requirements *
watts
Power rating at 25°C
Resistance range
ohms
TCR (-55° to 200°C)
Resistance tolerance
Low value limits
Isolation voltage
Limiting element voltage
Standard values
Thermal impedance
Ambient temperature range
ppm/°C
%
ohms
volts
volts
°C/watt
°C
≥5R
to
≤10R:
± 100
>10R: ±50
1000
150
16.0
1(F), 2(G), and 5(J)
1R at 1% 0R5 at 2% 0R05 at 5%
1000
2000
250
500
E24 preferred range
10.0
6.0
-55 to 200
2000
1250
3.5
DC or AC peak
DC or AC rms
Other values to order
On standard heatsink
* This table indicates the CECC specification requirements which are met or exceeded by the corresponding WH series products.
Power rating at 25°C
Resistance range
TCR (-55° to 200°C)
Resistance tolerance
Low value limits
Isolation voltage
Limiting element voltage
Standard values
Thermal impedance
Ambient temperature range
watts
ohms
ppm/°C
%
ohms
volts
volts
°C/watt
°C
WH100
100
0R01 to 70K
WH200
200
0R01 to 50K
≤1K0:
±100 >1K0: ±25
WH300
300
0R01 to 68K
Notes
On standard heatsink
Standard 5(J) and 10(K). also available : 1(F) and 2(G)
Typically
≥0R05:
±5%
≤0R047:
±10%
6360
7070
7070
1900
1900
2500
E24 preferred range
1
0.7
0.6
-55 to 200
DC or AC peak
DC or AC rms
Other values to order
On standard heatsink
General Note
General Note
Welwyn Components reserves the right
in
make
specification
product specification
TT electronics reserves the right to make changes
to
product
changes in
without notice or liability.
without notice or liability.
All information is subject to Welwyn’s own
and
data and is considered accurate
to
time
All information is subject to TT electronics’ own data
test
is considered accurate at time of going
at
print.
of print.
Welwyn
Components Limited
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Welwyn Electronics
© TT electronics plc
Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com
09. 11
Aluminium Housed
Aluminium Housed
Wirewound Resistors
WH Series
Wirewound Resistors
Physical Data
Dimensions (mm) & Weight (g)
WH5, 10, 25 & 50
A
Type
Max
WH5
WH10
WH25
WH50
30
36.5
51
1
B
±0.3
12.4
15.9
19.8
21.4
B
Max
88
145.7
184.4
C
±0.3
11.3
14.3
18.3
39.7
C
Max
24.1
41.8
41.8
D
Max
27.3
45.5
45.5
E
Min
1.9
1.9
2.8
2.8
E
Max
65.2
89.7
127.7
F
Max
17
21
28
30
F
±0.3
35
70
104
G
Max
9
11
15
16
G
±0.3
37
57.2
59
H
Dia ±0.2
2.4
2.4
3.3
3.3
H
Max
11.8
20.5
20.5
L
Max
17.0
21.0
29.0
51.0
J
Max
15.4
10.4
12.4
M
±0.5
4.3
5.2
7.2
7.9
K
Max
3.7
5.5
5.5
L
3
Nom
4.4
5.1
6.6
N
Max
1.8
2.2
2.6
2.6
M
Max
-
103.4
141.4
Dt
Min
2.5
2.9
4.3
5.1
Dt
Min
7.0
15
15
Wt.
Nom
3.6
5.6
13
29
Wt.
Nom
115
475
700
72.5
2
WH100, 200 & 300
A
Max
47.5
WH100
WH200
WH300
72.5
72.5
Note 1: A
max
for WH25T is 71.3
Note 2: A
max
for WH50T is 95.5
Note 3: WH100: ±0.25, WH200 & 300: ±0.45
WH5, 10, 25 & 50
WH100
WH200 & 300
Spade terminal on
WH25T & WH50T
Nominal dims in mm
End face tracking distance = Dt
Construction
Cap and lead assemblies are fitted to a high purity
ceramic substrate. The resistive element is wound onto
the substrate and welded to the caps. The wound rod is
then moulded and fitted into aluminium housing to give
optimum stability and reliability.
Marking
The resistors are legend marked with type reference,
resistance value and tolerance which will withstand all
accepted industrial cleaning fluids. Values are marked
in accordance with IEC 62
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own test data and is considered accurate at time of print.
General Note
Welwyn
Components Limited
TT electronics reserves the right
Bedlington, Northumberland, NE22 7AA, England. Tel: 01670
Welwyn Electronics Park,
to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
General Note
822181 Fax: 01670 829465 Web: www.welwyn-tt.com
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
09. 11
Aluminium Housed
Aluminium Housed
Wirewound Resistors
WH Series
Wirewound Resistors
Terminations
WH5-100
Material
Strength
Pb-free solder dipped, copper clad steel
The terminations meet the requirements
of IEC 68.2.21
The terminations meet the requirements
of IEC 115-1, clause 4.17.3.2
WH25T & 50T
6.35mm (¼“) spade terminal
WH200 & 300
Material
M6 threaded steel terminal with a
set of four nuts and washers
Strength
Termination robustness 50N max
Tightening torque 5Nm max
Solderability
Performance Data
Load at commercial rating: 1000hrs at 25°C
Load at CECC rating: 1000hrs at 25°C
Dry heat: 1000hrs at 200°C
Derating from 25°C
Short-term overload
Climatic sequence
Climatic category
Long-term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise (in decade of frequency)
Insulation resistance
Pulse and overload performance
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
µV/V
ohms
Note: A 0.05 ohm addition is to be added to the performance of all resistors < 10 ohms.
WH5, 10, 25 & 50
WH100, 200 & 300
CECC 40203-006
Actual
Maximum
Requirements
Maximum
Typical
1
1
0.4
2
1
1
0.4
N/A
1
1
0.4
2
Zero at 200°C, see derating graph
1
1
0.2
1
1
0.4
55/200/56
1
0.5
0.2
0.25
0.25
0.1
0.25
0.25
0.25
0.05
WH100: 0.5
0.25
0.25
0.025
Not specified
0
0
0
1G min
10G min
Not specified
See graphs
10000
1000
Pulse and Overload Performance
For short durations of
≤0.1s
the energy graph should
be used. For longer durations the overload graph
applies.
10
Energy (joules)
100
10
1
Multiple of Rated Power
WH25-300
WH300
WH200
WH100
WH50
WH25
WH10
WH5
WH5&10
WH5-50
WH100-300
1
0.1
1
10
Overload Duration (s)
100
1000
0.1
0.01
0.1
1
10
100
1000
Value (ohms)
10000 100000
Application Notes
After soldering, care should be taken to ensure that there are no flux residues on the end faces of the moulding
compound, otherwise insulation resistance will be reduced. The minimum surface tracking distances from termination
to casing are shown in the Physical Data tables as dimension Dt.
It is recommended that the resistor base should be coated thinly with heatsink compound before mounting to obtain
the stated operating characteristics. The heatsink compound increases thermal conductivity to the heatsink.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own test data and is considered accurate at time of print.
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
Welwyn
Components Limited
822181 Fax: 01670 829465 Web: www.welwyn-tt.com
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
09. 11
Aluminium Housed
Aluminium Housed
Wirewound Resistors
WH Series
Wirewound Resistors
The standard aluminium heatsinks are defined in the table below. If smaller heatsinks are used then derating should
2
be applied as indicated in the graph below. If no heatsink is employed, use the ratings for 1cm .
Reference heatsink dimensions
Type (CECC) Thickness (mm)
WH5 (AA)
1
WH10 (BA)
1
WH25 (CA)
1
WH50 (DA)
1
WH50 @ 50W
1.5
WH100
3
WH200
3
WH300
3
Area (cm²)
410
410
544
544
930
1000
3800
5800
Derating for reduced heatsink dimensions
1000
WH300 25°C
WH300 70°C
WH200 25°C
WH200 70°C
Ma xim um Dis sipa tion (W)
100
WH100 25°C
WH100 70°C
WH50 25°C
DA 25°C
DA 70°C
WH25/CA 25°C
WH25/CA 70°C
WH10/BA 25°C
WH10/BA 70°C
WH5/AA 25°C
WH5/AA 70°C
Derating for ambient temperature
1 20
Proportion of Pr (%)
1 00
80
60
40
20
0
0
10 0
20 0
A m b ie n t T e m p e ra tu r e (°C )
10
1
1
10
100
Heatsink Surface Area (cm )
2
1000
10000
Packaging
WH5, 10, 25, 50 &100 resistors are packed in plastic bags and boxed. WH200 & 300 are individually boxed.
Ordering Procedure
Type
Termination
T
Standard
Spade terminal
Example: WH25 with spade terminals at 100 ohms with a 5% tolerance:
WH25T–100RJ
I
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
G
1%
2%
J
K
5%
10%
Packing
I
Bulk
All Sizes
Standard
The following options apply to WH5, 10, 25 & 50 only:
For CECC released product state on order the CECC number and style. Example:
WH25-3K3JI CECC40203-006 CA
For SnPb finish instead of Pb-free replace the packing suffix with
PB.
Example:
WH25-3K3JPB
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own test data and is considered accurate at time of print.
General Note
11/10
General
Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com
Welwyn
Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Welwyn
Components Limited
© TT electronics plc
09. 11
Analog electronics
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