Resistors
Cement Coated Surface
Cement Coated Surface
Cement Coated Surface
Mount Wirewound Resistors
Mount Wirewound Resistors
Mount Wirewound Resistors
WA80Z Series
WA80Z Series
WA80Z Series
construction
All welded
•
All welded construction
Suitable for automatic pick and place
Features
•
Suitable for automatic pick and place
Excellent pulse handling capability
All welded construction
Excellent pulse handling
conditions
capability
•
Suitable for automatic pick and place
Fuses safely under fault
•
Fuses safely under fault conditions
Competitive cost
Excellent pulse handling capability
Performance equivalent to 2,
•
Competitive cost
Fuses safely under fault conditions
3 & 5W axial resistors
Welwyn Components
·
·
·
·
·
·
•
Competitive cost
Performance equivalent to 2, 3 & 5W
axial resistors
Performance equivalent to 2, 3 & 5W axial resistors
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
WA83Z
Power rating at 25˚C
Resistance range
Limiting element voltage
Isolation voltage
TCR
Resistance tolerance
Standard values
Ambient temperature range
°C
watts
ohms
volts
volts
ppm/°C
%
2
0R05 to 900R
50
250
<20R: 5, 10
WA84Z
3
0R01 to 2K2
100
350
≤1R0:350
>1R0:200
≥20R:
1, 2, 5, 10
E24 series preferred
-55 to 155
WA85Z
5
0R015 to 6K8
150
500
Physical Data
Dimensions (mm)
Type
WA83Z
WA84Z
WA85Z
L
13.4±0.2
18.7±0.2
18.7±0.2
W
3.6 max
5.2 max
7.0 max
H
6.25 max
6.9 max
7.9 max
l
9.0 max
14.5 max
16.5 max
w
4.5±0.6
6.5±0.6
6.5±0.6
d
0.8 nom
0.8 nom
0.8 nom
d
w
H
L
I
W
Recommended Pad Sizes
Dimensions (mm)
Type
WA83Z
WA84Z
WA85Z
A
5.5
7.5 min
7.5 min
B
2.5 min
2.5 min
2.5 min
C
10 max
15 max
15 max
D
15 min
20 min
20 min
B
A
C
D
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.
General Note
General
Note
General
Note
Welwyn Components reserves
make changes in
changes in product specification without
TT Electronics
reserves the right
the right to make
in product specification without notice or
notice or liability.
TT electronics
reserves the right to
to make changes
product specification without notice or liability.
liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
All
information
subject to TT Electronics’ own data and is considered accurate at time of going to print.
All
information is
is subject to TT electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
A subsidiary of
TT electronics plc
http://www.ttelectronics.com/resistors
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Issue G · 03.06
04.17
09. 11
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
electronics plc
Cement
Coated Surface
Cement
Coated Surface
Cement Coated Surface
Mount Wirewound Resistors
Resistors
Mount Wirewound Resistors
WA80Z
Series
WA80Z
Series
WA80Z Series
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.
Welwyn Components
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.
Performance Data
Maximum
Load at rated power: 1000hrs @ 25 or 70°C
Dry heat: 1000hrs @ 200°C
Short term overload
Derating from rated power @ 25°C
Climatic
Climatic category
TRC & Vibration
Robustness & solder heat
Long term damp heat
Temperature rise
Pulse handling
∆R%
∆R%
∆R%
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
See Graph 1
See Graph 2
∆R%
5 +0.001Ω
55/200/56
1
1
1
∆R%
∆R%
∆R%
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
Zero at 155˚C
2
Typical
3
3
1
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.
Temperature Rise
Graph 1
260
240
220
200
180
160
WA80Z Thermal Performance
Temp Rise (K)
140
120
100
80
60
40
20
0
0
0.5
WA83Z Hot Spot
1
1.5
2
2.5
Power (W)
3
WA84Z Joint
3.5
4
WA85Z Hot Spot
4.5
5
WA83Z Joint
WA84Z Hot Spot
WA85Z Joint
General
Note
General
Note
TT Electronics
reserves the right
make changes in
in product specification without notice or liability.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
TT electronics
reserves the right to
to make changes
product specification without notice or liability.
© TT
Electronics plc
electronics plc
BI Technologies IRC Welwyn
Issue G · 03.06
Telephone: +44 (0) 1670 822181 · Facsimile:
data and
1670 829465 · Email:
at time of going to print.
print.
All information is
is subject to TT electronics’ own data and is considered accurate at time of going to
Website: www.welwyn-tt.com
information
subject to TT Electronics’ own
+44 (0)
is considered accurate
info@welwyn-tt.com ·
http://www.ttelectronics.com/resistors
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
04.17
09. 11
Cement Coated Surface
Cement
Coated Surface
Cement
Coated Surface
Mount
Wirewound Resistors
Resistors
Mount Wirewound Resistors
Mount
WA80Z
Series
WA80Z
Series
Series
Welwyn Components
Pulse Handling
The graph below shows the energy handling capability of
WA80Z resistors for single short pulses (<100mS). For longer
pulses of duration up to 5 Seconds, up to 5 times the rated
power may be applied. Note that forced-air cooling and
heatsinking by PCB tracks have no effect on energy ratings.
If higher energy ratings than those shown are needed, it is
normally possible to design a pulse withstand variant.
Graph 2
100
WA80Z Energy Capability Graph
10
Energy (Joules)
1
0.1
0.01
0.1
1
10
Value (Ohms)
100
1000
10000
WA83Z
WA84Z
WA85Z
Packaging
WA80Z products are supply on standard carrier tape and
330mm diameter reels suitable for automatic pick and place
machines. Carrier tape dimensions and standard reels
quantities are given below.
Dimensions (mm)
Type
WA83Z
WA84Z
WA85Z
Ao
Bo
Ordering Procedure
Specify type reference, value and tolerance as shown in this
example of WA84Z at 1.5KOhms 5%:
Ao
5.3
7.3
7.4
P
Bo
13.9
19.2
19.2
Ko
6.3
7.1
8.2
Ko
W
W
24
32
32
P
12
12
12
T
0.4
0.4
0.4
Quantity
Per reel
750
750
650
ø 13mm
Type
Value (use IEC 62 code)
Tolerance (use IEC 62 code)
F
G
J
K
1%
2%
5%
10%
WA84Z
1K5
J
ø 330mm
All other dimensions as
per EIA481 standard
24mm / 32mm
General
Note
General
Note
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
TT electronics
reserves the right to make changes in product specification
Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
TT Electronics
reserves the right to
Facsimile: +44 (0) 1670
specification without notice or liability.
Issue G · 03.06
Telephone: +44 (0) 1670 822181 ·
make changes in product
829465 ·
without notice or liability.
All
information is subject to TT Electronics’ own data and is considered accurate at time
time of going to print.
All
information is subject to TT electronics’ own data and is considered accurate at
of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
http://www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
© TT
Electronics plc
electronics plc
©
09. 11
04.17
