Compact Flameproof Power
Compact Flameproof Power
Wirewound Resistors
Wirewound Resistors
WP-S Series
WP-S Series
Small size for power rating
Small size for power rating
Enhanced pulse handling capability
Enhanced pulse handling capability
Flameproof protection
Flameproof protection
SMD Z-form available
RoHS compliant with
SMD Z-form available
Pb-free terminations
Welwyn Components
·
·
·
·
·
RoHS compliant with Pb-free terminations
Electrical Data
WP1S
Power rating at 25 °C
5s overload rating at 25ºC
Short pulse performance
Resistance range
Limiting element voltage
TCR
Isolation Voltage
Resistance Tolerance
Standard Values
Thermal Impedance
Ambient temperature range
°C
°C/watt
140
110
ppm/°C
v olts
%
250
<20R: 5
≥20R:
1, 2, 5
E24 preferred
90
-55 to +155
82
62
54
ohms
volts
R068 to 430R
50
watts
watts
1
5
WP2S
2
10
R05 to 900R
50
<1R: 350
WP25S
2.5
12.5
WP3S
3
15
WP4S
4
20
R01 to 10K
100
500
<R10: 5
<20R: 5
≥R10:
1, 2, 5
≥20R:
1, 2, 5
WP5S
5
25
R015 to 6K8
150
See Pulse Performance graphs
R05 to 900R R01 to 2K2
75
100
≥1R:
200
350
Physical Data
Dimensions (mm) & Weight (g)
Type
L max
D max
f min
d nom
PCB
mount
centres
10.20
12.70
18.40
0.8
20.30
18.90
22.86
1.2
Min
bend
radius
0.6
Wt.
nom
0.22
0.50
0.50
1.10
1.00
1.75
D
WP1S
WP2S
WP25S
WP3S
WP4S
WP5S
6.2
9.0
12.5
14.5
13
16.5
2.8
3.6
4.5
5.2
(Note 1)
5.6
7.0
(Note 2)
(Note 3)
21.20
19.80
17.80
24.55
22.75
23.55
0.6
d
L
f
Note 1: 5.4 for values
≥
0R1 Note 2: 5.8 for values
≥
0R1 Note 3: 7.2 for values
≥
0R1
Construction
A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive
element is wound on the substrate and welded to the caps. Flameproof silicone cement coating is applied prior to marking with
indelible ink. The components are then leadformed if required and packed.
General Note
Welwyn Components reserves the
make
to make changes in
specification without notice or
notice or liability.
TT electronics reserves the right to
right
changes in product
product specification without
liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
A subsidiary of
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
TT electronics plc
08.10
11.12
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Compact Flameproof Power
Compact Flameproof Power
Compact Flameproof Power
Compact Flameproof Power
Wirewound Resistors
Compact
Wirewound
Flameproof Power
Wirewound Resistors
Wirewound Resistors
Resistors
WP-S Series
Wirewound
WP-S
Series
WP-S Series
Series
WP-S Series
Resistors
Welwyn Components
Welwyn Components
Welwyn Components
Welwyn Components
Terminations
Terminations
Terminations
Material:
Terminations
Material:
Strength:
Material:
Material:
Strength:
Solderability:
Strength:
Strength:
Solderability:
Solderability:
Solderability:
Marking
Marking
WP25S and WP3S resistors R10 and above are marked with four or five colour bands in conformance with IEC62.
Marking
Marking
WP1S, WP2S,
WP1S, WP2S, WP25S and WP3Swith three bands (two digits indicating value in or five colour bands in conformance with IEC62.
Values below
WP25S
marked resistors R10 and above are marked with four milliohms, and tolerance); there is no
with IEC62.
WP1S, WP2S, WP25S and WP3S resistors R10 and above are marked with four or
or five colour bands in conformance
multiplier
WP1S, WP2S,
R10 are
and WP3S resistors R10 and above are marked with four
five colour bands in conformance with IEC62.
Values below R10 are marked with three bands (two digitstype reference, resistance value and tolerance.there is no multiplier
band. WP4S and WP5S resistors are
three bands (two digits indicating value
milliohms, and tolerance); there is no multiplier
Values below R10 are marked with three bands (two digits indicating value in
in milliohms, and tolerance); there is no multiplier
Values below R10 are marked with
legend marked with indicating value in milliohms, and tolerance);
band. WP4S and WP5S resistors are legend marked with type reference, resistance value and tolerance.
band. WP4S and WP5S resistors are legend marked with type reference, resistance value and tolerance.
band. WP4S and WP5S resistors are legend marked with type reference, resistance value and tolerance.
Hot tin dipped copper wire
Hot tin dipped copper wire requirements of IEC 68.2.21
The terminations meet the
Hot tin dipped copper wire
Hot tin dipped copper wire
requirements of IEC 115-1 Clause 4.17.3.2
The terminations meet the requirements of IEC 68.2.21
The terminations meet the
The terminations meet the requirements of IEC 68.2.21
The terminations meet the requirements
IEC 115-1 Clause 4.17.3.2
The terminations meet the requirements of
of IEC 68.2.21
The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
Solvent Resistance
Solvent Resistance
resistant to all normal industrial cleaning solvents suitable for printed circuits.
Solvent Resistance
Solvent Resistance
The body protection and marking are
The body protection and marking are resistant to
to all normal industrial cleaning solvents suitable for printed circuits.
The body protection and marking are resistant
all normal industrial cleaning solvents suitable for printed circuits.
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Flammability
Flammability
Flammability
not burn or emit incandescent particles under any condition of applied temperature or power overload.
Flammability
The resistor coating will
The resistor coating will not burn
The resistor coating will not burn or
or emit incandescent particles under any condition of applied temperature or power overload.
The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload.
emit incandescent particles under any condition of applied temperature or power overload.
Performance Data
Performance Data
Performance Data
Performance Data
Load at rated power: 1000hrs @ 25°C
Load at rated power: 1000hrs @ 25°C
Load at rated power: 1000hrs @ 25°C
Dry heat: 1000hrs @ 200°C
Load at rated power: 1000hrs @ 25°C
Dry heat: 1000hrs @ 200°C
Dry heat: 1000hrs @ 200°C for 5s)
Short term overload (5 x Pr
Dry heat: 1000hrs @ 200°C
for 5s)
Short term overload (5 x Pr
Shortating from rated px Prefor 5s)°C
Der term overload (5 ow r @25
Short
ating from rated p
x Pr
e
for 5s)
°C
Der
term overload (5
ow r @25
Derating from rated power @25°C
Climatic
Derating from rated power @25°C
Climatic
Climatic category
Climatic
Climatic
Climatic category
TRC & Vibration
Climatic category
TRC & Vibration
solder heat
Robustness &
TRC & Vibration
Robustness & solder heat days)
Long term damp heat (56
Long term damp heat (56
Robustness & solder heat
days)
Long term damp heat (56 days)
Long term damp heat (56 days)
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
∆
R%
Maximum
Maximum
Maximum
5 +0.001Ω
Maximum
5 +0.001Ω
5 5 +0.001Ω
+0.001Ω
5
5 +0.001Ω
+0.001Ω
5 5 +0.001Ω
+0.001Ω
5
5 +0.001Ω
+0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5
5 +0.001Ω
+0.001Ω
5 +0.001Ω
5 5 +0.001Ω
+0.001Ω
5
5 +0.001Ω
+0.001Ω
5 +0.001Ω
5 +0.001Ω
Typical Change
Typical Change
Typical Change
3
Typical Change
3
33
3
3
31
3
1
1
Zero at 280°C
1
Zero at 280°C
Zero at 280°C
2
Zero at 280°C
2
2
55/200/56
2
55/200/56
1
55/200/56
1
1
1
11
1
1
1
1
Pulse
energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at
Performance
Pulse
energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at
The pulse
Performance
The pulse
The pulse energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at
25ºC.
The pulse energy capacity limits in the graph below
Short
to pulses below
Capacity
WP-S
relate
Pulse Energy
100ms duration, low mean power dissipation and at
25ºC.
WP-S Short Pulse Energy Capacity
25ºC.
25ºC.
Pulse Performance
Pulse Performance
100
100
100
Energy (joules)
Energy (joules)
Energy (joules)
Energy (joules)
10
10
10
1
10
100
WP-S Short Pulse Energy Capacity
WP-S Short Pulse Energy Capacity
WP5S
1
1
1
0.1
1
10
100
TT
© Welwyn Components
make changes in product specification without notice
UK
liability.
electronics reserves the right to
Limited
Bedlington, Northumberland NE22 7AA,
or
All
Telephone: +44
subject to
822181 · Facsimile: +44 (0) 1670 829465 ·
accurate at time of going to print.
information is
(0) 1670
TT electronics’
is considered
Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
08.10
© Welwyn Components Limited
own data and
Northumberland NE22 7AA, UK
Bedlington,
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
08.10
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
08.10
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Value (ohms)
10
100
1000
1
10
100
1000
1
10Value
100
1000
Bedlington, Northumberland NE22 7AA, UK
(ohms)
Value (ohms)
General Note
(0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44
Value (ohms)
0.1
0.1
0.1 0.1
0.1
0.1
0.1
© Welwyn Components Limited
1
WP5S
WP4S
WP5S
WP3S
WP5S
WP25S
WP4S
WP4S
WP3S
WP2S
WP25S
WP3S
WP1S
WP2S
WP25S WP3S
WP25S
WP2S
WP1S
WP2S
10000
1000
WP1S
WP1S
WP4S
10000
10000
10000
08.10
© TT electronics plc
11.12
Compact Flameproof Power
Compact Flameproof Power
Wirewound Resistors
Wirewound Resistors
WP-S
Series
WP-S
Series
Welwyn Components
Application Notes
1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than
4mm from the body.
2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An estimate of the
temperature rise to be expected at the center of the body can be calculated using the thermal impedance figures given under
Electrical Data.
3. WP-S resistors can also be supplied with radial, goalpost or lancet pre-formed leads. WP2S, WP3S, WP4S and WP5S are also
available in an SMD format with Z formed leads and packed in blister tape. Consult factory for details.
Radial
Goalpost
Lancet
Z-form
Packaging
The standard packaging for WP-S is taped. The critical dimensions are shown in Figure 1. The component wires will not
protrude beyond the outside edge of the tapes. Taped product is then packed into boxes or onto reels; see Ordering Procedure
for details. Alternative packaging is available by request. Pre-formed resistors are supplied loose packed in plastic bags or boxes.
Dimensions (mm)
WP1S
WP2S
WP25S
WP3S
WP4S
WP5S
b
52
52
52
67
63
63
c
5
5
5
10
10
10
Figure 1
C
f1
6
b
f2
6
Body location f1 - f2 < 1.4mm
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’
Bedlington,
is considered accurate
7AA, UK
© Welwyn Components Limited
own data and
Northumberland NE22
at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
08.10
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
11.12
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