Cement Coated
Wirewound Resistors
W30 Series
Values down to 10m ohms
Tolerance to 1%
Flameproofprotecon
Custom built to meet pulse requirements
SurfacemountZI-formopon
Cement Coated
Wirewound Resistors
W30 Series
•Values down to 10m ohms
•
Tolerance to 1%
•
Flameproof protection
•
Custom built to meet pulse requirements
Maximum Dimensions (mm) and Weight (g)
Type L max. D max. f min. d nom. Wt.nom.
W31 13 5.6 (note 1) 22.75 0.8 1.0
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 data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
99
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Electrical Data
Physical Data
Issue D · 07.06
A subsidiary of
TT electronics plc
Welwyn Components
L
Df
d
Construction
A high quality ceramic substrate is assembled with
interference fit end caps to which are welded the element
Note 1: 5.8 for values 0R1
to the body, providing an effective seal which is impervious to
moisture, shock, vibration, fungus and salt spray.
Terminations
Material Solder coated copper.
Strength The terminations meet the requirements of
IEC 68.2.21.
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
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.
Flammability
The resistor coating will not burn under any condition of
applied temperature or component overload.
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_
Resistors
06.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
R01: ±1000
>R01 - ≤R033: ±500
>R033 - ≤R091: ±200
>R091 - ≤10R: ±150
>10R: ±100
AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
AllPb-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Cement Coated
Wirewound Resistors
W30 Series
63
f1f2
66
10
f1– f2≤1.4 mm
Cement Coated
Wirewound Resistors
W30 Series
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
100
Issue D · 07.06
Welwyn Components
lacipyTmumixaM
Load: 1000 hrs 3 watts @ 25°C ∆R% 5.0 + .001Ω3.5
1000 hrs 2.5 watts @ 70°C ∆R% 5.0 + .001Ω3.5
Dry heat: 1000 hrs at 200°C ∆R% 5.0 + .001Ω3.5
evruc gnitared eeserutarepmet moor morf gnitareD
Short term overload 10 x rated power for 5 seconds ∆R% 5.0 + .001Ω1.0
Climatic ∆R% 5.0 + .001Ω3.5
Climatic category 55/200/56
Long term damp heat: 56 days ∆R% 3.0 + .001Ω1.0
Temperature rapid change ∆R% 2.0 + .001Ω1.5
Resistance to solder heat ∆R% 5.0 + .001Ω2.0
Vibration and bump ∆R% 5.0 + .001Ω2.0
nim 005stlov foorp egatloV
Pulse handling Data available by request
Performance Data
20 40 60 80 100 120 140 160 180 200 220 240 260 280
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Temp
W31 Series Derating Curve
% of Rated Power at 70
Application Notes
The terminations should not be bent closer than 1.6mm from
the body, and the recommended minimum bend radius is
1.2mm.
Care must be taken when determining clearance between the
resistor body and the P.C.B. or other components. Resistance
is measured 6mm from body.
Packaging
The standard method of packaging is taped in ammo packs.
Can be provided on reels by request.
These products are also available in a range of lead forming options.
In particular, it is available in ZI-form SMD format packed in blister tape
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
Ordering Procedure
Example: W31 at 1 kilohms and 1% tolerance packed in a box of 1000 pieces
W 3 1 – 1 K 0 F A 1
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
G
2%
J
5%
Packing
A1
Ammo
1000/box
T1
Tape
1000/reel
63
f
1
f
2
66
10
f
1
– f
2
≤1.4 mm
Cement Coated
Wirewound Resistors
W30 Series
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
100
Issue D · 07.06
Welwyn Components
lacipyTmumixaM
Load: 1000 hrs 3 watts @ 25°C ∆R% 5.0 + .001Ω3.5
1000 hrs 2.5 watts @ 70°C ∆R% 5.0 + .001Ω3.5
Dry heat: 1000 hrs at 200°C ∆R% 5.0 + .001Ω3.5
evruc gnitared eeserutarepmet moor morf gnitareD
Short term overload 10 x rated power for 5 seconds ∆R% 5.0 + .001Ω1.0
Climatic ∆R% 5.0 + .001Ω3.5
Climatic category 55/200/56
Long term damp heat: 56 days ∆R% 3.0 + .001Ω1.0
Temperature rapid change ∆R% 2.0 + .001Ω1.5
Resistance to solder heat ∆R% 5.0 + .001Ω2.0
Vibration and bump ∆R% 5.0 + .001Ω2.0
nim 005stlov foorp egatloV
Pulse handling Data available by request
Performance Data
20 40 60 80 100 120 140 160 180 200 220 240 260 280
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Temp
W31 Series Derating Curve
% of Rated Power at 70
Application Notes
The terminations should not be bent closer than 1.6mm from
the body, and the recommended minimum bend radius is
1.2mm.
Care must be taken when determining clearance between the
resistor body and the P.C.B. or other components. Resistance
is measured 6mm from body.
Packaging
The standard method of packaging is taped in ammo packs.
Can be provided on reels by request.
These products are also available in a range of lead forming options.
In particular, it is available in ZI-form SMD format packed in blister tape
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
Ordering Procedure
Example: W31 at 1 kilohms and 1% tolerance packed in a box of 1000 pieces
W 3 1 – 1 K 0 F A 1
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
G
2%
J
5%
Packing
A1
Ammo
1000/box
T1
Tape
1000/reel
06.18
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn