鈼?/div>
Resistance values down to 0.01 ohms
Electrical Data
Power rating at 25擄c
watts
Power rating at 70擄c
watts
Resistance range
ohms
Limiting element voltage volts
Isolation voltage
volts
TCR
ppm/擄C
Resistance tolerance
%
Values
Thermal impedance
擄C/watt
Ambient temperature range 擄C
WA82
WA83
1
2.0
.86
1.6
0.068 to 430 0.05 to 900
50
50
250
250
<1鈩?350
WA835
2.5
2.0
0.05 to 900
75
250
WA84
3.0
2.5
0.01 to 2K2
100
350
WA85
5
4.3
.05 to 4K5
150
500
>1鈩?200
WA87
7
6
0.15 to 10K
150
700
140
110
5, 10
E24 preferred
82
90
- 55 to 155
54
35
Physical Data
Dimensions (mm) and Weight (g)
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
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
d dia
D
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 and
84, copper weld on 85 and 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.
MARKING
WA85 and 87 resistors are legend marked with type
reference, resistance value and tolerance. In conformance
with IEC 62.
WA82, 83, 835 and 84 resistors RIO and above are colour
coded with 4 bands in conformance with IEC 62. Values
below RIO are 3 band marked, two digits and tolerance,
there is no multiplier band.
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.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn鈥檚 own data and is considered accurate at time of going to print.
漏 Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk
Issue A 07/99
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