General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Thick Film
Metal Glaze™ Resistor
Electrical Data
GF Series
• Rugged molded jacket
• Flame resistant construction
• Metal Glaze™ thick film element
• High temperature soldered termination
IRC
Type Flamability Marking Tolerance
(±%)
T.C.
(ppm/°C)
IRC Power Rating
(watts @ °C)
GF-55
GF-07
Flame Resist¹
Flame Resist¹
Stamp
Stamp
1
2, 5
50*, 100
100
1/2W @ 70°C
1/2W @ 70°C
GF-60
GF-20
Flame Resist¹
Flame Resist¹
Stamp
Stamp
1
2, 5
50*, 100
100
3/4W @ 70°C
3/4W @ 70°C
GF-3 Flame Resist¹ Stamp 1, 2, 5 200 2W @ 70°C
3W @ 25°C
IRC
Type
Maximum Voltage
Rating
IRC Resistance
Range (ohms)
MIL Resistance
Range (ohms) Nominal Size Dimension Code
GF-55
GF-07
250
250
0.4 to 2M
0.4 to 2M
-
-
1/4W
1/4W
3
3
GF-60
GF-20
350
350
0.4 to 2M
0.4 to 2M
-
-
1/2W
1/2W
4
4
GF-3 750 1 to 2M - 3W 5
NOTE: ¹Contact factory for details of flame-resistant specification.
*T.C. of 50 ppm/°C on values of 10 ohms or greater.
GF Series Issue October 2008 Sheet 1 of 2
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Wire and Film Technologies Division
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
Physical Data
Dimensions
Dim
Code
Nominal
Size
Body Length
BL
Body Diameter
BD
Lead Length
LL
Lead Diameter
LD Clean Lead
3 1/4 0.250 ± 0.015
(6.4 ± 0.4)
0.090 ± 0.008
(2.3 ± 0.2)
0.150 ± 0.125
(38.1 ± 3.2)
0.025 ± 0.002
(0.64 ± 0.05)
0.310
(7.9)
4 1/2W 0.390 ± 0.010
(9.9 ± 0.3)
0.140 ± 0.008
(3.8 ± 0.2)
0.150 ± 0.125
(38.1 ± 3.2)
0.025 ± 0.002
(0.64 ± 0.05)
0.450
(11.4)
5 3W 0.515 ± 0.010
(13.1 ± 0.3)
0.225 ± 0.008
(5.7 ± 0.2)
0.150 ± 0.125
(38.1 ± 3.2)
0.032 ± 0.002
(0.81 ± 0.05)
0.575
(14.6)
Thick Film
Metal Glaze™ Resistor
LL
LD
BL
BD
GF Series Issue October 2008 Sheet 2 of 2
Sample Part No.
MIL Style
GS = Fixed film resistor. High stability
Power Rating
07 = 1/2 watt
20 = 3/4 watt
3 = 3 watt
T.C. Characteristics
D = ±100 ppm/°C
C = ±50 ppm/°C
Resistance
First three digits represent significant figures; fourth digit is number of zero’s.
Tolerance
F = ±1%, G = ±2%, J = ±5%
Ordering Data
GF - 20 D 1002 F
