WELWYN WA85Z1K5J

Cement Coated Surface
Mount Wirewound Resistors
Welwyn Components
WA80Z Series
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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
Electrical Data
WA83Z
WA84Z
WA85Z
Power rating at 25˚C
watts
2
3
5
Resistance range
0R015 to 6K8
ohms
0R05 to 900R
0R01 to 2K2
Limiting element voltage
volts
50
100
150
Isolation voltage
volts
250
350
500
TCR
≤1R0:350 >1R0:200
ppm/°C
Resistance tolerance
%
≥20R: 1, 2, 5, 10
<20R: 5, 10
Standard values
E24 series preferred
Ambient temperature range
°C
-55 to 155
Physical Data
Dimensions (mm)
Type
W
I
L
W
H
l
w
d
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
H
L
w
d
Recommended Pad Sizes
Dimensions (mm)
Type
B
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
C
A
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
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: [email protected] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue G · 03.06
Cement Coated Surface
Mount Wirewound Resistors
Welwyn Components
WA80Z Series
Marking
Solvent Resistance
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.
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
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
Derating from rated power @ 25°C
1
Zero at 155˚C
∆R%
Climatic
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
Note: Testing was performed on FR4 test boards measuring 50mm x 50mm, with 1oz/ft2 (300g/m2) copper pads. The track area
close to each pad was 120mm2. If a lower grade of PCB or less track area is used, derating of the power may be necessary.
Temperature Rise
WA80Z Thermal Performance
Graph 1
260
240
220
200
180
Temp Rise (K)
160
140
120
100
80
60
40
20
0
0
0.5
WA83Z Hot Spot
1
1.5
WA83Z Joint
2
2.5
Power (W)
WA84Z Hot Spot
3
WA84Z Joint
3.5
4
WA85Z Hot Spot
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
4.5
5
WA85Z Joint
Issue G · 03.06
Cement Coated Surface
Mount Wirewound Resistors
Welwyn Components
WA80Z Series
Pulse Handling
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.
The graph below shows the energy handling capability of
CSM 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
Graph 2
WA80Z Energy Capability Graph
100
Energy (Joules)
10
1
0.1
0.01
0.1
1
10
Value (Ohms)
WA83Z
Packaging
CSM 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
Ao
Bo
Ko
W
P
T
Quantity
Per reel
WA83Z
5.3
13.9
6.3
24
12
0.4
750
WA84Z
7.3
19.2
7.1
32
12
0.4
750
WA85Z
7.4
19.2
8.2
32
12
0.4
650
ø 13mm
Ao
Ko
P
Bo
ø 330mm
W
100
WA84Z
1000
10000
WA85Z
Ordering Procedure
Specify type reference, value and tolerance as shown in this
example of WA84Z at 1.5KOhms 5%:
Type
WA84Z
1K5
J
Value (use IEC 62 code)
Tolerance (use IEC 62 code)
F
G
J
K
1%
2%
5%
10%
All other dimensions as
per EIA481 standard
24mm / 32mm
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
Issue G · 03.06