Resistors
Cement Coated
Cement Coated
Wirewound Resistors
Wirewound Resistors
W30 Series
W30 Series
Welwyn Components
•
•
•
•
Values down to 10m
Tolerance to 1%
ohms
Tolerance to
protection
Flameproof
1%
Flameproof protection
Custom built to meet pulse requirements
Custom built to meet pulse requirements
Surface mount ZI-form option
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Values down to 10m ohms
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
TCR
°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
Other values to special order
Notes
R01: ±1000
>R01 -
≤R033:
±500
>R033 -
≤R091:
±200
>R091 -
≤10R:
±150
>10R: ±100
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.
TT Electronics reserves the right to make changes in product specification without
at time
or liability.
to print.
All information is subject to Welwyn’s own data and is considered accurate
notice
of going
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
www.ttelectronics.com/resistors
Issue D · 07.06
01.18
99
Cement Coated
Cement Coated
Wirewound
Coated
Cement
Resistors
Wirewound Resistors
W30 Series
Wirewound
W30 Series
W30 Series
Resistors
Welwyn Components
Welwyn Components
Performance Data
Performance Data
Load:
1000 hrs 3 watts @ 25°C
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
Load:
1000 hrs
hrs 3 watts @ 25°C
1000
2.5 watts @ 70°C
Dry heat: 1000 hrs at
watts @ 70°C
1000 hrs 2.5
200°C
Maximum
5.0 +
ximum
Ma
.001Ω
5.0 +
+ .001Ω
5.0
.001Ω
5.0 +
+ .001Ω
5.0
.001Ω
5.0 + .001Ω
see derating curve
Typical
3.5
Typical
3.5
3.5
3.5
3.5
3.5
see derating curve
D
Dry
t
heat:
rom room
at
mperature
era ing f
1000 hrs
te
200°C
Short
ting from room tem
rated
ure
Dera
term overload 10 x
perat
power for 5 seconds
Climatic
Short term overload 10 x rated power for 5 seconds
Climatic
Climatic category
Climatic
damp heat: 56 days
Long term
category
Long term
rapid change
Temperature
damp heat: 56 days
Temperature rapid
heat
Resistance to solder
change
Resistance to solder
Vibration and bump
heat
∆R%
∆R%
∆R%
∆R%
5.0 + .001Ω
5.0 +
+ .001Ω
5.0
.001Ω
5.0 + .001Ω
1.0
3.5
1.0
3.5
55/200/56
55/200/56
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
3.0 + .001Ω
3.0
.001Ω
2.0 +
+ .001Ω
2.0
.001Ω
5.0 +
+ .001Ω
5.0
.001Ω
5.0 +
+ .001Ω
5.0 + .001Ω
1.0
1.0
1.5
1.5
2.0
2.0
2.0
2.0
V
Vibration
oof
bump
oltage pr
and
Volt
handling
Pulse
age proof
Pulse handling
130
W31 Series Derating Curve
120
130
110
120
100
110
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
20 40 60 80 100 120 140 160 180 200 220 240 260 280
0
20 40 60 80 100 120 140 160 180 200 220 240 260 280
v
∆R%
olts
volts
500 min
500
by
Data available
min
request
Data available by request
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
minimum bend
1.6mm
the body, and the recommended
bent closer than
radius is
from
the body,
1.2mm.
and the recommended minimum bend radius is
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 measured 6mm from body.
is measured 6mm from body.
The standard method of packaging is taped in ammo packs.
The standard method of packaging is taped in ammo packs.
Can be provided on reels by request.
Can be provided on reels by request.
These products are also available in a
a range of lead forming options.
These products are also available in
range of lead forming options.
In particular, it
it is available in ZI-form SMD format packed in blister tape
In particular,
is available in ZI-form SMD format packed in blister tape
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
6
6
f
1
f
1
Packaging
Packaging
Temp
Temp
10
10
63
63
f
1
f
1
–
–
2
f
2
≤
≤
1.4 mm
f
1.4 mm
f
2
f
2
6
6
Ordering Procedure
Ordering Procedure
Example: W31 at 1
1
kilohms and 1% tolerance packed in a
a
box of 1000 pieces
Example: W31 at kilohms and 1% tolerance packed in box of 1000 pieces
W 3
3
1
1
–
–
1
1
K 0
0
F
F
A 1
1
W
K
A
Type
Type
Value (use IEC62 code)
Value (use IEC62 code)
Tolerance (use IEC62 code)
Tolerance (use IEC62 code)
F
F
G
G
J
J
1%
1%
2%
2%
5%
5%
Packing
Packing
A1
A1
T1
T1
Ammo
Ammo
Tape
Tape
1000/box
1000/box
1000/reel
1000/reel
Standard
Standard
100
100
TT Electronics reserves the right to
· Facsimile: +44 (0) 1670 829465 ·
without notice or liability.
Telephone: +44 (0) 1670 822181
make changes in product specification
Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© Welwyn
General Note
Components Limited
Bedlington, Northumberland NE22 7AA, UK
BI Technologies
© 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
IRC
Issue D · 07.06
Welwyn
Issue D · 07.06
www.ttelectronics.com/resistors
© TT Electronics plc
01.18
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