Fusible Carbon
Film Resistors
FC4
Welwyn Components
•
Predictable fusing characteristics
•
Constant voltage fusing characteristics
•
Fuses at very low powers
•
Flame retardant lacquer
Electrical Data
FC4
Power rating at 70°C
Resistance range
TCR
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
°C/watt
°C
watts
ohms
ppm/°C
%
0.33
1R0-5K1
300
5, 10
E24 preferred
215
-55 to 125
Physical Data
Dimensions (mm) & Weight (g)
PCB
mounting
Type
FC4
L Max
6.2
D Max
2.5
f min
21.0
d nom
0.6
centres
10.2
Min.
bend
radius
0.6
Wt.nom
0.3
d
D
L
f
Construction
The carbon film is deposited on a high purity ceramic rod.
End caps are fitted and termination wires welded to the caps.
The resistive film is adjusted to the required value by a special
helical cut; finally the flame retardant lacquer protection is
applied to the resistor body and marked with an indelible ink.
Marking
Resistance value and tolerances are identified in accordance
with IEC62.4 - band colour code. A fifth (yellow) band
denotes that the product is fusible and suitable for use in
constant voltage applications.
Solvent Resistance
Terminations
Material
Strength
Solder-coated copper wire.
The terminations meet the requirements of
IEC 68.2.21
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn or emit incandescent
particles under any condition of applied temperature or
power overload.
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.
A subsidiary of
TT electronics plc
Issue B · 03.02
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
166
WELWYN [ WELWYN COMPONENTS LIMITED ]
