WA80 Datasheet, PDF (1/3 Pages) Welwyn Components Limited – General Purpose Cement Coated Wirewound Resistors

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}
Welwyn Components
Electrical Data
Power rating at 25°c
Power rating at 70°c
Resistance range
Limiting element voltage
Isolation voltage
TCR
Resistance tolerance
Values
Thermal impedance
Ambient temperature range
watts
watts
ohms
volts
volts
ppm/°C
%
°C/watt
°C
WA82
1
.86
0R068 to 430
50
250
140
WA83
WA835
WA84
WA85
2.0
2.5
3.0
5
1.6
2.0
2.5
4.3
0R05 to 900R 0R05 to 900R 0R01 to 2K2 0R015 to 6K8
50
75
100
150
250
250
350
500
<1Ω:350
>1Ω:200
<20R: 5, 10 ≥20R: 1, 2, 5, 10
E24 preferred
110
82
90
54
- 55 to 155
WA87
7
6
0R15 to 10K
150
700
35
Physical Data
Dimensions (mm) and Weight (g)
Type
WA82
WA83
WA835
WA84
WA85
WA87
L max.
6.2
9.0
12.5
14.5
16.5
25.0
D max.
2.8
3.6
4.5
5.2
7.0
8.8
f min.
21.20
19.80
17.80
24.55
23.55
28.30
d nom.
0.6
0.8
0.8
0.8
0.8
0.8
PCB
mounting
centres
10.20
12.70
18.40
20.30
22.86
31.40
Min
bend
radius
0.6
1.2
1.2
1.2
1.2
1.2
Wt
nom.
0.22
0.50
0.50
1.10
1.75
4.40
dD
L
f
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 Solder-coated copper wire on 82, 83, 835, 84,
and 85, solder coated cooper clad steel on 87.
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.
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: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue D · 08.04
89