Cement Coated
Cement Coated
Wirewound Resistors
Wirewound Resistors
W30 Series
W30 Series
·
Values down to 10m ohms
·
Values down to 10m ohms
Tolerance to 1%
·
Tolerance to
protection
Flameproof
1%
·
Flameproof protection
pulse requirements
Custom built to meet
Custom built to meet pulse requirements
Welwyn Components
Electrical Data
W31
Power rating at 25°C
Power rating at 70°C
Resistance range
TCR (-55 to 155°C)
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
Limiting element voltage
TC R
°C/watt
°C
volts
ppm/°C
watts
watts
ohms
ppm/°C
%
3.0
2.5
0R01 to 10K
See below
<R10: 5 >=R10: 1, 2, 5
E24 series preferred
83
-55 to 155
100
0.01 ohms <1000
0.033 ohms <500
0.091 ohms <200
10 ohms <150
10K ohms <100
Other values to special order
Notes
Physical Data
Maximum Dimensions (mm) and Weight (g)
Type
W31
L max.
13
D max.
5.6 (note 1)
f min.
22.75
d nom.
0.8
Wt.nom.
1.0
d
D
L
f
_
Note 1: 5.8 for values <0R1
Construction
A high quality ceramic substrate is assembled with
interference fit end caps to which are welded the element
to the body, providing an effective seal which is impervious to
moisture, shock, vibration, fungus and salt spray.
Marking
W31 resistors are legend marked with type reference,
resistance value and tolerance. Values are marked in
accordance with IEC 62.
Solvent Resistance
The body and marking are resistant to all normal industrial
cleaning solvents suitable for printed circuits.
Terminations
Material
Strength
Solderability
Solder coated copper.
The terminations meet the requirements of
IEC 68.2.21.
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
Flammability
The resistor coating will not burn under any condition of
applied temperature or component overload.
General Note
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
A subsidiary of
All information is subject
right to make changes in product specification without notice or liability.
TT electronics reserves the
to Welwyn’s own data and is considered accurate at time of going to print.
TT electronics plc
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
· Bedlington, Northumberland NE22 7AA, UK
Issue D · 07.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
09. 11
99
Cement Coated
Cement Coated
Cement
Resistors
Wirewound
Coated
Wirewound Resistors
Wirewound
W30 Series
W30 Series
W30 Series
Resistors
Welwyn Components
Welwyn Components
Performance Data
Performance Data
Load: 1000 hrs 3 watts @ 25°C
Load:
1000 hrs
hrs 3 watts @ 25°C
1000
2.5 watts @ 70°C
1000 hrs 2.5
200°C
Dry heat: 1000 hrs at
watts @ 70°C
Dry heat: 1000 hrs at 200°C
Derating from room temperature
Derating from room temperature
Short term overload 10 x rated power for 5 seconds
Short term overload 10 x rated power for 5 seconds
Climatic
Climatic
Climatic category
Climatic category
Long term damp heat: 56 days
Long term damp heat: 56 days
Temperature rapid change
Temperature rapid change
Resistance to solder heat
Resistance to solder heat
Vibration and bump
Vibration and bump
Voltage proof
Voltage proof
Pulse handling
Pulse handling
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
Maximum
Ma
.001Ω
5.0 +
ximum
5.0
.001Ω
5.0 +
+ .001Ω
5.0
.001Ω
5.0 +
+ .001Ω
5.0 + .001Ω
Typical
Typical
3.5
3.5
3.5
3.5
3.5
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
volts
volts
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
3.0 + .001Ω
3.0 + .001Ω
2.0 + .001Ω
2.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
5.0 + .001Ω
see derating curve
see derating curve
3.5
55/200/56
55/200/56
1.0
1.0
3.5
3.5
1.0
1.0
1.5
1.5
2.0
2.0
2.0
2.0
500 min
500 min
Data available by request
Data available by request
130
130
120
120
110
110
100
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
20 40 60 80 100 120 140 160 180 200 220 240 260 280
20 40 60 80 100 120 140 160 180 200 220 240 260 280
W31 Series Derating Curve
W31 Series Derating Curve
% of Rated Power at 70
% of Rated Power at 70
Application Notes
Application Notes
The terminations should not be bent closer than 1.6mm from
The terminations should not be bent closer than 1.6mm from
the body, and the recommended minimum bend radius is
is
the body, and the recommended minimum bend radius
1.2mm.
1.2mm.
Care must be taken when determining clearance between the
Care must be taken when determining clearance between the
resistor body and the P.C.B. or other components. Resistance
resistor body and the P.C.B. or other components. Resistance
is
is measured 6mm from body.
measured 6mm from body.
Temp
Temp
10
10
Packaging
Packaging
The standard method of packaging
taped in ammo packs.
The standard method of packaging is
is taped in ammo packs.
Can be provided on reels by request.
Can be provided on reels by request.
W31 resistors can be supplied preformed.
W31 resistors can be supplied preformed.
Contact factory for details.
Contact factory for details.
f
1
f
1
6
6
f
2
f
2
6
6
63
63
– f
≤
1.4 mm
f
1
f
1
–
2
f
2
≤
1.4 mm
Ordering Procedure
Ordering Procedure
Example: W31 at
kilohms and 1% tolerance packed in a box of
1000 pieces
Example: W31 at 1
1 kilohms and 1% tolerance packed in a box of
1000 pieces
W
1–1K0FA1
W 3
3 1 – 1 K 0 F A 1
Type
Type
Value (use IEC62 code)
Value (use IEC62 code)
Tolerance (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
F
G
1%
2%
G
J
2%
5%
J
5%
A1
T1
T1
Packing
Packing
Ammo
A1
Ammo
Tape
Tape
1000/box
1000/box
1000/reel
1000/reel
Standard
Standard
Issue D · 07.06
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
100
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
100
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
General Note
©
Telephone: +44 (0) 1670
right to make changes in
(0) 1670
specification without notice or liability.
· Website: www.welwyn-tt.com
TT
Welwyn
reserves the
822181 · Facsimile: +44
product
829465 · Email: info@welwyn-tt.com
electronics
Components Limited
Bedlington, Northumberland NE22 7AA, UK
Issue D · 07.06
© TT electronics plc
09. 11
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