General Purpose
Carbon Film Resistors
GCF Series
Drop in replacement for CF/CR
Low cost
Extensive resistance range
Wide range of sizes and power ratings
RoHS compliant
Electrical Data
GCF¼
Power rating @70°C
Resistance range
Limiting element voltage
Max overload voltage
Dielectric withstanding voltage
TCR
watts
volts
volts
volts
ppm/°C
0.125
200
400
300
0.25
250
500
500
GCF¼S
0.25
200
400
300
GCF½
0.5
350
700
700
<10R
<10R ~ <60K
<60K ~ <200K
<200K ~ <1M0
<1M0K ~ 10M
Resistance tolerance
Standard values
Ambient temperature range
°C
Note: 'S' denotes smaller body size - see physical data
%
GCF½S
0.5
250
500
500
:
:
:
:
:
±5
E24
-55 to +155
GCF1
1
500
1000
1000
GCF1S
1
400
700
700
GCF2
2
500
1000
1000
GCF2S
2
500
800
700
GCF3S
3
500
1000
1000
ohms 1R0-1M0 1R0-10M 1R0-1M0 1R0-10M 1R0-10M 1R0-10M 1R0-10M 1R0-10M 1R0-10M 1R0-10M
0±350
0 ~ -500
0 ~ -700
0 ~ -1000
0 ~ -1500
Physical Data
L max
GCF1/8
GCF¼
GCF¼S
GCF½
GCF½S
GCF1
GCF1S
GCF2
GCF2S
GCF3S
3.5
6.8
3.5
10
6.8
16
12
17.5
16
17.5
D max
1.85
2.5
1.85
3.5
3
5.5
5
6.5
5.5
6.5
f min
25
25
25
25
25
25
25
25
25
25
d ± 0.10
0.5
0.55
0.5
0.6
0.55
0.8
0.63
0.8
0.8
0.8
PCB mounting
centres
min. Bend
Radius
Wt. nom.
7.6
10.2
7.6
15.2
10.2
20.3
17.8
22.9
20.3
22.9
0.5
0.55
0.5
0.6
0.55
1.2
0.6
1.2
1.2
1.2
0.1
0.3
0.1
0.55
0.35
1.0
0.65
1.2
1.0
1.2
d
D
L
f
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyns own data and is considered accurate at time of going to print.
© Welwyn Components Limited
Bedlington Northumberland NE22 7AA, UK
A subsidiary of
TT electronics plc
Issue D . 11.06
Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
GCF Series
Construction
A carbon film is deposited onto a ceramic former. Plated steel caps are then fitted before the resistor is adjusted to value by a helical
cut in the film. Termination wires are then welded to the caps and the body of the resistor is protected with an epoxy coating.
Terminations
Material
Strength
Hot tin dipped copper wire.
The terminations meet the requirements of IEC 68.2.21
SolderabilityThe
terminations meet the requirements of IEC 115-1,Clause 4.17.3.2
Marketing
Resistance value and tolerance are identified in accordance with IEC 62 4-band colour code.
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Performance Data
Maximum Change
Load life
Load life in humidity
Temperature rapaid change
Derating from rated power at 70°C
Short term overload
Terminal strength
Resistance to solder heat
Solderability
Resistance to solder heat
Insulation resistance
Dielectric withstanding
min
D
R%
D
R%
D
R%
D
R%
D
R%
3
5
1 + 0.05
W
Zero at 155°C
1 + 0.05
W
No evidence of mechanical damage
1 + 0.05
W
Minimum of 95% coverage
No deterioration of protective coating and marking
1000M
No evidence of flahover, mechanical damage, arcing of insulation breakdown
© 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
Issue A . 11.06
GCF Series
Packaging
All GCF resistors are supplied ammo tape packed ready for loading on to automatic sequencing and insertion machines.
Component wires will not protrude beyond the outside edge of the tapes.
Alternative packaging available by request
GCF
¼
52
5
52
5
¼S
52
5
½
52
5
½S
52
5
1
52
10
1S
52
5
2
67
10
2S
67
10
3S
67
10
W
B
B
Body location f1-f2 < 1.4mm
6
f
1
W
f
2
6
Application Notes
If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm
from the body. Due to operating temperature limits imposed by some PCB materials, derating may be necessary.
GCF resistors can also be supplied with radial, goalpost or lancet pre-formed leads. Consult Factory for details.
Radial
Goalpost
Lanset
Ordering Procedure
Example: GCF1/4 small size at 10 kilohms and 5% tolerance and ammo packed in a box with a standard quantity of 5000pcs.
GCF1 / 4S 10K J A5
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
J
5%
Packing
A5
A1
A05
Ammo
Pack
GCF
1 8
, GCF
1 4
, GCF
1 4
S, GCF
1 2
S,
GCF
1 2
, GCF1, GCF1S, GCF2S
GCF2, GCF3S
5000 / Box
1000 / Box
500 / Box
© 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
Issue A . 11.06
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