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Welwyn Components Limited - Fast Fusible Metal Film Resistors

Numéro de référence WFF
Description Fast Fusible Metal Film Resistors
Fabricant Welwyn Components Limited 
Logo Welwyn Components Limited 





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WFF fiche technique
Fast Fusible Metal
Film Resistors
WFF Series
Low power fusing
Predictable fusing characteristics
Flameproof protection
www.DataSheet4U.com
Welwyn Components
Electrical Data
Power rating at 70˚ C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
watts
ohms
volts
ppm/˚ C
%
˚ C/watt
˚C
WFF1/4
0.25
0R1 - 10K
250
150
WFF1/2
0.5
0R10 - 27K
350
250
5
E24 preferred
120
-55 to 155
WFF1
1
0R2 - 1K5
350
100
Physical Data
Dimensions (mm) & Weight (g)
Type L D f
max max min
WFF1/4 6.2
2.53 21.0
WFF1/2 9.0
3.4 19.6
WFF1 12.5 4.2 17.8
d PCB Min.
nom mounting bend
centres radius
0.6 10.2 0.6
0.8 12.7 1.2
0.8 18.4 1.2
Wt.
nom
0.3
0.6
0.9
dD
L
f
Construction
The metal film is deposited on a high purity ceramic rod. End
caps are force fitted and termination wires welded to the
caps. The resistive film is adjusted to the required value by a
special helical cut. A fuse aid coating is then applied. Finally a
cement protection is applied to the resistor body prior to
marking with indelible ink.
Terminations
Material
Solder-coated copper wire.
Strength
The terminations meet the requirements of
IEC68.2.21.
Solderability The terminations meet the requirements of
IEC 115-1 Clause 4.17.3.2.
Marking
Resistors are colour coded with 5 bands. Four of the bands
are used to indicate values and tolerance, with IEC 62 colours
being used. A fifth yellow band denotes constant voltage
fusibility.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistors will not burn or emit incandescent particles
under any condition of applied temperature or power
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: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issuee DE · 031..0067
161

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