Cement Coated Surface
Mount Wirewound Resistors
WA80Z Series
Features
Allweldedconstrucon
Suitableforautomacpickandplace
Excellentpulsehandlingcapability
Fusessafelyunderfaultcondions
Compevecost
Performanceequivalentto2,3&5Waxialresistors
Resistors
Cement Coated Surface
Mount Wirewound Resistors
WA80Z Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
09. 11
· All welded construction
· Suitable for automatic pick and place
· Excellent pulse handling capability
· Fuses safely under fault conditions
· Competitive cost
· Performance equivalent to 2, 3 & 5W axial resistors
Dimensions (mm)
Type L W H l wd
WA83Z 13.4±0.2 3.6 max 6.25 max 9.0 max 4.5±0.6 0.8 nom
WA84Z 18.7±0.2 5.2 max 6.9 max 14.5 max 6.5±0.6 0.8 nom
WA85Z 18.7±0.2 7.0 max 7.9 max 16.5 max 6.5±0.6 0.8 nom
Cement Coated Surface
Mount Wirewound Resistors
WA80Z Series
•
All welded construction
•
Suitable for automatic pick and place
•
Excellent pulse handling capability
•
Fuses safely under fault conditions
•
Competitive cost
•
Performance equivalent to 2, 3 & 5W
axial resistors
WA83Z WA84Z WA85Z
Power rating at 25˚C watts 2 3 5
Resistance range ohms 0R05 to 900R 0R01 to 2K2 0R015 to 6K8
Limiting element voltage volts 50 100 150
Isolation voltage volts 250 350 500
TCR ppm/°C ≤1R0:350 >1R0:200
Resistance tolerance % <20R: 5, 10 ≥20R: 1, 2, 5, 10
Standard values E24 series preferred
Ambient temperature range °C -55 to 155
Dimensions (mm)
Type A B C D
WA83Z 5.5 2.5 min 10 max 15 min
WA84Z 7.5 min 2.5 min 15 max 20 min
WA85Z 7.5 min 2.5 min 15 max 20 min
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
Electrical Data
Physical Data
Recommended Pad Sizes
Issue G · 03.06
A subsidiary of
TT electronics plc
Welwyn Components
d
H
I
L
W
w
Construction
A high purity ceramic substrate is assembled with interference
fit end caps to which are welded the terminations. The
resistive element is wound on the substrate and welded to
the caps. Flameproof silicone cement coating is applied
prior to marking with indelible ink and lead forming.
D
B
C
A
05.21
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-freepartscomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Cement Coated Surface
Mount Wirewound Resistors
WA80Z Series
Cement Coated Surface
Mount Wirewound Resistors
WA80Z Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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.
© TT electronics plc
09. 11
© 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
Issue G · 03.06
Welwyn Components
Marking
WA83Z and WA84Z resistors R10 and above are marked with
four colour bands in conformance with IEC62. Values
below R10 are marked with three bands (two digits and
tolerance); there is no multiplier band. WA85Z resistors are
legendmarked “WA85” plus resistance value and tolerance in
conformance with IEC62.
Solvent Resistance
The body protection 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.
WA80Z Thermal Performance
0
20
40
60
80
100
120
140
160
180
200
220
240
260
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Power (W)
Temp Rise (K)
WA83Z Hot Spot WA83Z Joint WA84Z Hot Spot WA84Z Joint WA85Z Hot Spot WA85Z Joint
Graph 1
Performance Data
Temperature Rise
Note: Testing was performed on FR4 test boards measuring 50mm x 50mm, with 1oz/ft
2
(300g/m
2
) copper pads. The track area
close to each pad was 120mm
2
. If a lower grade of PCB or less track area is used, derating of the power may be necessary.
Maximum Typical
Load at rated power: 1000hrs @ 25 or 70°C ∆R% 5 +0.001Ω 3
Dry heat: 1000hrs @ 200°C ∆R% 5 +0.001Ω 3
Short term overload ∆R% 5 +0.001Ω 1
Derating from rated power @ 25°C Zero at 155˚C
Climatic ∆R% 5 +0.001Ω 2
Climatic category 55/200/56
TRC & Vibration ∆R% 5 +0.001Ω 1
Robustness & solder heat ∆R% 5 +0.001Ω 1
Long term damp heat ∆R% 5 +0.001Ω 1
Temperature rise See Graph 1
Pulse handling See Graph 2
Cement Coated Surface
Mount Wirewound Resistors
WA80Z Series
05.21
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