Resistors
General Purpose Cement
General Purpose Cement
Coated Wirewound Resistors
Coated Wirewound Resistors
WA80 Series
Cost effective
WA80 Series
Features
Flameproof protection
Can replace carbon comp. in many applications
Surface mount ZI-form option
Flameproof protection
Resistance values down to 0.01 ohms
Can replace carbon comp. in many applications
Ideal for pulse handling applications
Resistance values down to 0.01 ohms
Ideal for pulse handling applications
Welwyn Components
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
WA82
Power rating at 25°c
Power rating at 70°c
Resistance range
Limiting element voltage
Isolation voltage
TC R
Resistance tolerance
Values
Thermal impedance
Ambient temperature range
°C/wat t
°C
140
110
watt s
watt s
ohms
volts
volts
ppm/° C
%
1
.86
0R068 to 430
50
250
WA83
2.0
1.6
0R05 to 900R
50
250
<1
Ω
:350
<20R: 5, 10
E24 preferred
90
- 55 to 200
82
54
WA835
2.5
2.0
0R05 to 900R
75
250
WA84
3.0
2.5
0R01 to 2K2
100
350
>1
Ω:200
≥20R:
1, 2, 5, 10
WA85
5
4.3
0R015 to 6K8
150
500
Physical Data
Dimensions (mm) and Weight (g)
PCB
mounting
centres
10.20
12.50
17.50
20.00
22.00
Min
bend
radius
0.6
1.2
1.2
1.2
1.2
Wt
nom.
0.22
0.50
0.50
1.10
1.75
d
D
Type
WA82
WA83
WA835
WA84
WA85
L max.
6.2
9.0
12.5
14.5
16.5
D max.
2.8
3.6
4.5
(Note 1)
(Note 2)
f min.
21.20
19.80
17.80
24.55
23.55
d nom.
0.6
0.8
0.8
0.8
0.8
5.2
7.0
L
f
Note 1: 5.4 for values
≥
0R1
Note 2: 7.2 for values
≥
0R1
Construction
A high quality ceramic substrate is assembled with
interference fit end caps to which are welded the termination
wires. The resistive element is wound on the substrate and
welded to the caps. Cement protection is applied to the
resistor body before marking with indelible ink.
Terminations
Material
Strength
Hot tin dipped copper wire
The terminations meet requirements of
IEC 68.2.21.
Solderability
The terminations meet the requirements of IEC
115-1, Clause 4.17.3.2.
General Note
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
BI Technologies IRC Welwyn
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
07.11
11.20
Welwyn Components 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.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© TT Electronics plc
© 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
General
Purpose Cement
General
Purpose Cement
Coated
Wirewound Resistors
Coated
Wirewound Resistors
WA80 Series
WA80 Series
Marking
General Purpose
Components
Welwyn
Cement
Coated Wirewound Resistors
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
Solvent
WA80 Series
Resistance
WA85 resistors are legend marked with type
reference, resistance value and tolerance. In conformance
with IEC 62.
WA82, 83, 835 and 84 resistors 0R1 and above are colour
coded with 4 bands in conformance with IEC 62. Values
below 0R1 are 3 band marked, two digits and tolerance,
there is no multiplier band.
Marking
WA85
Flammability
resistors are legend marked with type
So
reference, resistance value and tolerance. In conformance
The resistor coating will not burn under any condition of
with IEC 62.
applied temperature or component overload.
WA82, 83, 835 and 84 resistors 0R1 and above are colour
coded with 4 bands in conformance with IEC 62. Values
below 0R1 are 3 band marked, two digits and tolerance,
there is no multiplier band.
Maximum
pi
Performance Data
Ty
3.0
cal
5.0 + .001Ω
5.0 + .001Ω
3.0
Load at rated
S
power:
a
1000
c
hrs
e
25 or 70°c
at
ee der ting urv
Dry
.001Ω
5.0 +
heat: 1000 hrs at 200°c
D
+
ting fr
5.0
era
.001Ω
om rated power at 25° c
∆R%
∆R%
∆R%
The
ind
Fla
The
app
Performance Data
Load at rated power: 1000 hrs at 25 or 70°c
Dry heat: 1000 hrs at 200°c
Derating from rated power at 25° c
Short term overload
Climatic
Climatic category
Long term damp Heat: 56 days
T.R.C. & Vibration
Robustness & Solder Heat
Pulse Handling
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
See:
∆R%
∆R%
1.0
2.0
1.0
1.0
1.0
Short term overload
55/200/56
Climatic
5.0 + .001Ω
Climatic category
5.0 + .001Ω
Long term damp Heat: 56 days
5.0 + .001Ω
T.R.C. & Vibration
Robustness & Solder Heat
Pulse Handling
∆R%
∆R%
∆R%
∆R%
∆R%
https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicationNotes/Wirewound-Pulse-Overload-Resistors.pdf
Se
Application Notes
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.
htt
Application Notes
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
All resistors are supplied tape packed ready for loading onto
automatic sequencing and insertion machines. The critical
dimensions are shown in figure 2.
Component wires will not protrude beyond the outside edge
of the tapes.
All taped resistors will be supplied either on reels or in
ammopacks, depending upon quantities orderded.
Packaging
All resistors are supplied tape packed ready for loading onto
automatic sequencing and insertion machines. The critical
dimensions are shown in figure 2.
Figure
Component wires will not protrude beyond the outside edge
2
of the tapes.
All taped resistors will be supplied either on reels or in
c
ammopacks, depending upon quantities orderded.
WA80
products
can be supplied with
a range
goalpost
forming options.
These
resistors
are also available in
radial,
of lead
or lancet pre-formed
leads - see
WA83, 84 and 85 are available in ZI-form SMD format
In particular,
resistors-Leadform-Capability.pdf.
https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicationNotes/TN008-
WA83, 84 and 85 is also available in ZI-form SMD format packed in blister
tape - see
https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Resistors/Datasheets/ZI-form.pdf
packed in blister tape
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
Type
b
WA82
52
5
WA83
52
5
WA835
52
5
WA84
67
10
WA85
63
10
These products are also available in a range of lead forming options.
In particular, WA83, 84 and 85 are available in ZI-form SMD format
f
1
f
2
packed in blister tape
b
6
6
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.
Body Location f
1
– f
2
≤
1.4 mm
Type
b
c
WA82
52
5
WA83
52
5
WA835
52
5
WA84
67
10
WA85
63
10
c
General 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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© 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
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 ·
07.11
info@welwyn-tt.com
Email:
11.20
General Purpose Cement
Coated Wirewound Resistors
WA80 Series
Ordering Procedure
Example: WA83-470RJI
(WA83, 470 ohms ±5%, Pb-free)
W
A
A
1
Type
8
1
2
Value
3
-
4
7
2
3
Tolerance
F = ±1%
G = ±2%
J = ±5%
K = ±10%
0
R
J
3
I
4
4
Packing
WA82
WA83
Ammo
WA835
WA84
Tape WA85
5000/box
2500/box
1500/box
1000/box
750/reel
WA82 E24 = 3/4 characters
WA83
R = ohms
WA835
K = kilohms
WA84
WA85
I
General 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.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
11.20
