Features
SurfacemountZI-formopon
Flameproofprotecon
Canreplacecarboncomp.inmanyapplicaons
Resistance values down to 0.01 ohms
Idealforpulsehandlingapplicaons
General Purpose Cement
Coated Wirewound Resistors
WA80 Series
Dimensions (mm) and Weight (g)
PCB Min
mounting bend Wt
Type L max. D max. f min. d nom. centres radius nom.
WA82 6.2 2.8 21.20 0.6 10.20 0.6 0.22
WA83 9.0 3.6 19.80 0.8 12.70 1.2 0.50
WA835 12.5 4.5 17.80 0.8 18.40 1.2 0.50
WA84 14.5 5.2 24.55 0.8 20.30 1.2 1.10
(Note 1)
(Note 2)
Note 1: 5.4 for values 0R1 Note 2: 7.2 for values 0R1
WA85 16.5 7.0 23.55 0.8 22.86 1.2 1.75
General Purpose Cement
Coated Wirewound Resistors
WA80 Series
Cost effective
Flameproof protection
Can replace carbon comp. in many applications
Resistance values down to 0.01 ohms
Ideal for pulse handling applications
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
WA82 WA83 WA835 WA84 WA85
Power rating at 25°c watts 1 2.0 2.5 3.0 5
Power rating at 70°c watts .86 1.6 2.0 2.5 4.3
Resistance range ohms 0R068 to 430 0R05 to 900R 0R05 to 900R 0R01 to 2K2 0R015 to 6K8
Limiting element voltage volts 50 50 75 100 150
Isolation voltage volts 250 250 250 350 500
1<C°/mppRCT Ω1>053: Ω:200
01 ,5 :R02<%ecnarelot ecnatsiseR ≥20R: 1, 2, 5, 10
Values E24 preferred
Thermal impedance °C/watt 140 110 90 82 54
551 ot 55 -C°egnar erutarepmet tneibmA
Electrical Data
Physical Data
07.11
A subsidiary of
TT electronics plc
Welwyn Components
L
D
f
d
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 Hot tin dipped copper wire
Strength The terminations meet requirements of
IEC 68.2.21.
Solderability The terminations meet the requirements of IEC
115-1, Clause 4.17.3.2.
≥≥
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
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)
General Purpose Cement
Coated Wirewound Resistors
WA80 Series
b
f1f2
66
c
Body Location f 1 – f 2 ≤ 1.4 mm
Marking
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.
General Purpose Cement
Coated Wirewound Resistors
WA80 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 07.11
Welwyn Components
lacipyTmumixaM
Load at rated power: 1000 hrs at 25 or 70°c ∆R% 5.0 + .001Ω3.0
Dry heat: 1000 hrs at 200°c ∆R% 5.0 + .001Ω3.0
evruc gnitared eeSc°52 ta rewop detar morf gnitareD
Short term overload ∆R% 5.0 + .001Ω1.0
Climatic ∆R% 5.0 + .001Ω2.0
Climatic category ∆R% 55/200/56Ω
Long term damp Heat: 56 days ∆R% 5.0 + .001Ω1.0
T.R.C. & Vibration ∆R% 5.0 + .001Ω1.0
Robustness & Solder Heat ∆R% 5.0 + .001Ω1.0
Pulse Handling Data available by request
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
Flammability
The resistor coating will not burn under any condition of
applied temperature or component overload.
Performance Data
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.
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
packed in blister tape
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
Figure 2
Type WA82 WA83 WA835 WA84 WA85
b 52 52 52 67 63
c 5 5 5 10 10
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
General Purpose Cement
Coated Wirewound Resistors
WA80 Series
General Purpose Cement
Coated Wirewound Resistors
WA80 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 07.11
Welwyn Components
Ordering Procedure
Example: WA83 at 470 ohms and 5% tolerance in ammo pack box of 2500 pieces -
W A 8 3 – 4 7 0 R J I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
J
5%
G
2%
K
10%
Packing
I
WA82
Standard
WA83
WA835
WA84
WA85
Ammo
Tape
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