WA84F Datasheet, PDF (1/2 Pages) Welwyn Components Limited – Fusible Wirewound Resistors

Fusible Wirewound
Resistors
WA84F
• Predictable fusing characteristics
• ^{Flameproof protection}
• ^{Suitable for pulse and fuse applications}
Welwyn Components
Electrical Data
Power rating at 25°C
Power rating at 70°C
Resistance range
Limiting element voltage
Isolation voltage
TCR (-55°C to 155°C)
Resistance tolerance
Values
Thermal impedance
Ambient temperature range
watts
watts
ohms
volts
volts
ppm/°C
%
°C/watt
°C
WA84F
2.0
1.6
0R2 to 30R
100
350
≤1 Ω:350 >1 Ω:100
5
E24 preferred
90
- 55 to 155
Physical Data
Dimensions (mm) and Weight (g)
Type
L max
WA84F 14.5
D max
5.2
f min
23.6
d nom
0.8
PCB
mounting
centres
20.3
Min
bend
radius
1.2
Wt.nom
1.1
dD
L
f
Construction
A high purity 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.
Marking
Resistors are colour coded with five bands. Four of the bands
are used to indicate value and tolerance, with IEC62 colours
being used. A fifth yellow band denotes fusibility.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Terminations
Material
Solder-coated copper wire
Strength
The terminations meet the requirements of
IEC 68.2.21.
Solderability The terminations meet the requirements of
IEC 115-1, Clause 4. 17. 3. 2.
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’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
170
A subsidiary of
TT electronics plc
Issue C · 04.03